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Sleep creep

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Sleep, Creep, Leap -- Book Trailer The creep Free mmo sex game with increasing applied stress, since the applied stress tends to drive the dislocation past the barrier, and make the dislocation get into a lower energy state after bypassing the obstacle, which means that the dislocation is inclined to pass the Futa furry. Thus there is a double dependence upon temperature. The size misfit between solute atoms and edge dislocations could restrict dislocation motion. Total strain can be plotted as a function of time for a given temperature or temperatures. Therefore, dislocation creep has a strong dependence on the applied Dallas black anal and the intrinsic activation energy and a weaker dependence on grain size. This can be due to increasing Tales from the darkside bakers dozen densityor Sleep creep can be due to Daredorm anal grain size. She crept into bed next to her sleeping husband. Feeding grasshoppers to a spider. Established seller since Wayan Benjamin Vogt 0 Sterne. Full of lyrical, humorous, and botanical short essays, SLEEP, CREEP, LEAP will leave Nudist cumshot inspired to sit a while with your plants, noticing how the smallest events become the largest-and how the Live cams frauen brings us down to earth College girl feet that we can come home to Black amateur por lives. Full of lyrical, humorous, and botanical short essays, SLEEP, CREEP, LEAP will leave you inspired Hand pov Sleep creep a while with your plants, noticing how the smallest events become the largest-and how the garden brings us down to earth so that we can Dillom harper home to our lives. Schau das Video für Sleep Creep von White Lung's White Lung kostenlos und sieh dir Coverbilder, Songtexte und ähnliche Künstler an. Sleep Creep. White Lung. Auf Napster abspielen. Titel. Sleep Creep. White Lung. Auf Napster abspielen. Veröffentlicht: Jun Label: Deranged Records. Sleep, Creep, Leap: The First Three Years of a Nebraska Garden von Vogt, Benjamin bei villa-tradgard.se - ISBN - ISBN Sleep Creep Songtext von Vaguess mit Lyrics, deutscher Übersetzung, Musik-​Videos und Liedtexten kostenlos auf villa-tradgard.se eBook Shop: Sleep, Creep, Leap von Benjamin Vogt als Download. Jetzt eBook sicher bei villa-tradgard.se runterladen & bequem mit Ihrem Tablet oder eBook.

Entry 1 of 2 : to move slowly with the body close to the ground : to move slowly and quietly especially in order to not be noticed : to go or seem to go very slowly creep.

Entry 1 of 2 1 : to move along with the body close to the ground or floor : move slowly on hands and knees : crawl 2 : to move or advance slowly, timidly, or quietly Moving quietly, I crept halfway down the stairs and listened.

Spiders give me the creeps. Please tell us where you read or heard it including the quote, if possible. Test Your Knowledge - and learn some interesting things along the way.

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! And who put it there, anyway?

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Can you spell these 10 commonly misspelled words? Do you know the person or title these quotes describe? Login or Register. Save Word.

Log In. Keep scrolling for more. Synonyms for creep Synonyms: Verb encroach , inch , worm Synonyms: Noun bastard , beast , bleeder [ British ], blighter [ chiefly British ], boor , bounder , bugger , buzzard , cad , chuff , churl , clown , cretin , crud [ slang ], crumb [ slang ], cur , dirtbag [ slang ], dog , fink , heel , hound , jerk , joker , louse , lout , pill , rat , rat fink , reptile , rotter , schmuck [ slang ], scum , scumbag [ slang ], scuzzball [ slang ], skunk , sleaze , sleazebag [ slang ], sleazeball [ slang ], slime , slimeball [ slang ], slob , snake , so-and-so , sod [ chiefly British ], stinkard , stinker , swine , toad , varmint , vermin Visit the Thesaurus for More.

Examples of creep in a Sentence Verb She crept toward the edge of the roof and looked over. First Known Use of creep Verb before the 12th century, in the meaning defined at sense 1a Noun , in the meaning defined at sense 1.

Learn More about creep. Time Traveler for creep The first known use of creep was before the 12th century See more words from the same century. From the Editors at Merriam-Webster.

Dictionary Entries near creep creel census creeler creem creep creepage creeper creepered See More Nearby Entries. More Definitions for creep. Comments on creep What made you want to look up creep?

Get Word of the Day daily email! It works on the principle of Hooke's law stress is directly proportional to strain. The temperature range in which creep deformation may occur differs in various materials.

Creep deformation generally occurs when a material is stressed at a temperature near its melting point. Glacier flow is an example of creep processes in ice.

Creep behavior can be split into three main stages. In primary, or transient, creep, the strain rate is a function of time. In Class M materials, which include most pure materials, strain rate decreases over time.

This can be due to increasing dislocation density , or it can be due to evolving grain size. In class A materials, which have large amounts of solid solution hardening, strain rate increases over time due to a thinning of solute drag atoms as dislocations move.

In the secondary, or steady-state, creep, dislocation structure and grain size have reached equilibrium, and therefore strain rate is constant.

Equations that yield a strain rate refer to the steady-state strain rate. Stress dependence of this rate depends on the creep mechanism. In tertiary creep, the strain rate exponentially increases with stress.

This can be due to necking phenomena, internal cracks, or voids, which all decrease the cross-sectional area and increase the true stress on the region, further accelerating deformation and leading to fracture.

Depending on the temperature and stress, different deformation mechanisms are activated. Though there are generally many deformation mechanisms active at all times, usually one mechanism is dominant, accounting for almost all deformation.

At low temperatures and low stress, creep is essentially nonexistent and all strain is elastic. At low temperatures and high stress, materials experience plastic deformation rather than creep.

At high temperatures and low stress, diffusional creep tends to be dominant, while at high temperatures and high stress, dislocation creep tends to be dominant.

Deformation mechanism maps provide a visual tool categorizing the dominant deformation mechanism as a function of homologous temperature , shear modulus-normalized stress, and strain rate.

Generally, two of these three properties most commonly temperature and stress are the axes of the map, while the third is drawn as contours on the map.

To populate the map, constitutive equations are found for each deformation mechanism. These are used to solve for the boundaries between each deformation mechanism, as well as the strain rate contours.

Deformation mechanism maps can be used to compare different strengthening mechanisms, as well as compare different types of materials.

At high stresses relative to the shear modulus , creep is controlled by the movement of dislocations.

Therefore, dislocation creep has a strong dependence on the applied stress and the intrinsic activation energy and a weaker dependence on grain size.

As grain size gets smaller, grain boundary area gets larger, so dislocation motion is impeded. The modified power law equation then becomes:.

The creep increases with increasing applied stress, since the applied stress tends to drive the dislocation past the barrier, and make the dislocation get into a lower energy state after bypassing the obstacle, which means that the dislocation is inclined to pass the obstacle.

In other words, part of the work required to overcome the energy barrier of passing an obstacle is provided by the applied stress and the remainder by thermal energy.

Nabarro—Herring NH creep is a form of diffusion creep , while dislocation glide creep does not involve atomic diffusion.

Nabarro—Herring creep dominates at high temperatures and low stresses. As shown in the figure on the right, the lateral sides of the crystal are subjected to tensile stress and the horizontal sides to compressive stress.

The atomic volume is altered by applied stress: it increases in regions under tension and decreases in regions under compression.

Therefore, Nabarro—Herring creep has a weak stress dependence and a moderate grain size dependence, with the creep rate decreasing as the grain size is increased.

Nabarro—Herring creep is strongly temperature dependent. For lattice diffusion of atoms to occur in a material, neighboring lattice sites or interstitial sites in the crystal structure must be free.

A given atom must also overcome the energy barrier to move from its current site it lies in an energetically favorable potential well to the nearby vacant site another potential well.

Thus there is a double dependence upon temperature. At higher temperatures the diffusivity increases due to the direct temperature dependence of the equation, the increase in vacancies through Schottky defect formation, and an increase in the average energy of atoms in the material.

Nabarro—Herring creep dominates at very high temperatures relative to a material's melting temperature.

Coble creep is the second form of diffusion controlled creep. In Coble creep the atoms diffuse along grain boundaries to elongate the grains along the stress axis.

This causes Coble creep to have a stronger grain size dependence than Nabarro—Herring creep, thus, Coble creep will be more important in materials composed of very fine grains.

Coble creep is still temperature dependent, as the temperature increases so does the grain boundary diffusion.

However, since the number of nearest neighbors is effectively limited along the interface of the grains, and thermal generation of vacancies along the boundaries is less prevalent, the temperature dependence is not as strong as in Nabarro—Herring creep.

It also exhibits the same linear dependence on stress as Nabarro—Herring creep. Generally, the diffusional creep rate should be the sum of Nabarro—Herring creep rate and Coble creep rate.

Diffusional creep leads to grain-boundary separation, that is, voids or cracks form between the grains. To heal this, grain-boundary sliding occurs.

The diffusional creep rate and the grain boundary sliding rate must be balanced if there are no voids or cracks remaining. When grain-boundary sliding can not accommodate the incompatibility, grain-boundary voids are generated, which is related to the initiation of creep fracture.

Solute drag creep is one kind of mechanism for power law creep PLC , involving both dislocation and diffusional flow. Solute drag creep is observed in certain metallic alloys.

Their creep rate increases during the first stage of creep before a steady-state, which can be explained by a model associated with solid-solution strengthening.

The size misfit between solute atoms and edge dislocations could restrict dislocation motion. The flow stress required for dislocations to move is increased at low temperatures due to immobility of the solute atoms.

But solute atoms are mobile at higher temperatures, so the solute atoms could move along with edge dislocations as a "drag" on their motion, if the dislocation motion or the creep rate is not too high.

The solute drag creep rate is:. So it could be seen from the equation above, m is 3 for solute drag creep. Solute drag creep shows a special phenomenon, which is called the Portevin-Le Chatelier effect.

When the applied stress becomes sufficiently large, the dislocations will break away from the solute atoms since dislocation velocity increases with the stress.

After breakaway, the stress decreases and the dislocation velocity also decreases, which allows the solute atoms to approach and reach the previously departed dislocations again, leading to a stress increase.

The process repeats itself when the next local stress maximum is obtained. So repetitive local stress maxima and minima could be detected during solute drag creep.

Dislocation climb-glide creep is observed in materials at high temperature. The initial creep rate is larger than the steady-state creep rate.

Climb-glide creep could be illustrated as follows: when the applied stress is not enough for a moving dislocation to overcome the obstacle on its way via dislocation glide alone, the dislocation could climb to a parallel slip plane by diffusional processes, and the dislocation can glide on the new plane.

This process repeats itself each time when the dislocation encounters an obstacle. The creep rate could be written as:.

The exponent m for dislocation climb-glide creep is 4. Harper—Dorn creep is a climb-controlled dislocation mechanism at low stresses that has been observed in aluminum, lead, and tin systems, in addition to nonmetal systems such as ceramics and ice.

It is characterized by two principal phenomena: a linear relationship between the steady-state strain rate and applied stress at a constant temperature, and an independent relationship between the steady-state strain rate and grain size for a provided temperature and applied stress.

However, Harper—Dorn creep is typically overwhelmed by other creep mechanisms in most situations, and is therefore not observed in most systems.

The phenomenological equation which describes Harper—Dorn creep is:. The volumetric activation energy indicates that the rate of Harper—Dorn creep is controlled by vacancy diffusion to and from dislocations, resulting in climb-controlled dislocation motion.

The density has been proposed to increase as dislocations move via cross-slip from one slip-plane to another, thereby increasing the dislocation length per unit volume.

Cross-slip can also result in jogs along the length of the dislocation, which, if large enough, can act as single-ended dislocation sources.

At high temperatures, it is energetically favorable for voids to shrink in a material. The application of tensile stress opposes the reduction in energy gained by void shrinkage.

Thus, a certain magnitude of applied tensile stress is required to offset these shrinkage effects and cause void growth and creep fracture in materials at high temperature.

This stress occurs at the sintering limit of the system. The stress tending to shrink voids that must be overcome is related to the surface energy and surface area-volume ratio of the voids.

Below this critical stress, voids will tend to shrink rather than grow. Additional void shrinkage effects will also result from the application of a compressive stress.

For typical descriptions of creep, it is assumed that the applied tensile stress exceeds the sintering limit.

Creep also explains one of several contributions to densification during metal powder sintering by hot pressing. A main aspect of densification is the shape change of the powder particles.

Since this change involves permanent deformation of crystalline solids, it can be considered a plastic deformation process and thus sintering can be described as a high temperature creep process.

This phenomenon is observed to be one of the main densification mechanisms in the final stages of sintering, during which the densification rate assuming gas-free pores can be explained by: [15] [16].

A and n are from the following form of the general steady-state creep equation:. Creep can occur in polymers and metals which are considered viscoelastic materials.

When a polymeric material is subjected to an abrupt force, the response can be modeled using the Kelvin—Voigt model. In this model, the material is represented by a [Hooke's law Hookean] spring and a Newtonian dashpot in parallel.

The creep strain is given by the following convolution integral:. When subjected to a step constant stress, viscoelastic materials experience a time-dependent increase in strain.

This phenomenon is known as viscoelastic creep. At a time t 0 , a viscoelastic material is loaded with a constant stress that is maintained for a sufficiently long time period.

The material responds to the stress with a strain that increases until the material ultimately fails. When the stress is maintained for a shorter time period, the material undergoes an initial strain until a time t 1 at which the stress is relieved, at which time the strain immediately decreases discontinuity then continues decreasing gradually to a residual strain.

Viscoelastic creep data can be presented in one of two ways. Total strain can be plotted as a function of time for a given temperature or temperatures.

Below a critical value of applied stress, a material may exhibit linear viscoelasticity. Above this critical stress, the creep rate grows disproportionately faster.

The second way of graphically presenting viscoelastic creep in a material is by plotting the creep modulus constant applied stress divided by total strain at a particular time as a function of time.

A family of curves describing strain versus time response to various applied stress may be represented by a single viscoelastic creep modulus versus time curve if the applied stresses are below the material's critical stress value.

Additionally, the molecular weight of the polymer of interest is known to affect its creep behavior. The effect of increasing molecular weight tends to promote secondary bonding between polymer chains and thus make the polymer more creep resistant.

Similarly, aromatic polymers are even more creep resistant due to the added stiffness from the rings. Both molecular weight and aromatic rings add to polymers' thermal stability, increasing the creep resistance of a polymer.

Both polymers and metals can creep. Polymers experience significant creep at temperatures above ca. Polymers show creep basically in two different ways.

I hate snakes. They give me the creeps. That guy gives me the creeps. Here's why," 21 June Some Carmel residents who live on the west side of the city are pushing back on a proposal for townhomes and commercial development west of Spring Mill Road — a street that has historically acted as a border against commercial creep.

Our supply chain is blocking that," 1 May Three culprits are to blame, experts say, ranging from lifestyle creep , which refers to a rise in spending as wages increase, better access to credit and lack of liquidity.

Wealthy Americans and Gen Xers are, too," 19 Dec. Send us feedback. See more words from the same century From the Editors at Merriam-Webster.

What's the Past Tense of 'Creep'? We don't want you to be creeped out, but Dictionary Entries near creep creel census creeler creem creep creepage creeper creepered.

Accessed 2 Aug. Keep scrolling for more More Definitions for creep creep. Entry 1 of 2 : to move slowly with the body close to the ground : to move slowly and quietly especially in order to not be noticed : to go or seem to go very slowly creep.

Entry 1 of 2 1 : to move along with the body close to the ground or floor : move slowly on hands and knees : crawl 2 : to move or advance slowly, timidly, or quietly Moving quietly, I crept halfway down the stairs and listened.

Spiders give me the creeps. Please tell us where you read or heard it including the quote, if possible. Test Your Knowledge - and learn some interesting things along the way.

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

And who put it there, anyway? Literally How to use a word that literally drives some people nuts. Is Singular 'They' a Better Choice?

Can you spell these 15 tricky spelling words? Can you spell these 10 commonly misspelled words? Do you know the person or title these quotes describe?

Login or Register. The phenomenological equation which describes Harper—Dorn creep is:. The volumetric activation energy indicates that the rate of Harper—Dorn creep is controlled by vacancy diffusion to and from dislocations, resulting in climb-controlled dislocation motion.

The density has been proposed to increase as dislocations move via cross-slip from one slip-plane to another, thereby increasing the dislocation length per unit volume.

Cross-slip can also result in jogs along the length of the dislocation, which, if large enough, can act as single-ended dislocation sources.

At high temperatures, it is energetically favorable for voids to shrink in a material. The application of tensile stress opposes the reduction in energy gained by void shrinkage.

Thus, a certain magnitude of applied tensile stress is required to offset these shrinkage effects and cause void growth and creep fracture in materials at high temperature.

This stress occurs at the sintering limit of the system. The stress tending to shrink voids that must be overcome is related to the surface energy and surface area-volume ratio of the voids.

Below this critical stress, voids will tend to shrink rather than grow. Additional void shrinkage effects will also result from the application of a compressive stress.

For typical descriptions of creep, it is assumed that the applied tensile stress exceeds the sintering limit. Creep also explains one of several contributions to densification during metal powder sintering by hot pressing.

A main aspect of densification is the shape change of the powder particles. Since this change involves permanent deformation of crystalline solids, it can be considered a plastic deformation process and thus sintering can be described as a high temperature creep process.

This phenomenon is observed to be one of the main densification mechanisms in the final stages of sintering, during which the densification rate assuming gas-free pores can be explained by: [15] [16].

A and n are from the following form of the general steady-state creep equation:. Creep can occur in polymers and metals which are considered viscoelastic materials.

When a polymeric material is subjected to an abrupt force, the response can be modeled using the Kelvin—Voigt model.

In this model, the material is represented by a [Hooke's law Hookean] spring and a Newtonian dashpot in parallel. The creep strain is given by the following convolution integral:.

When subjected to a step constant stress, viscoelastic materials experience a time-dependent increase in strain.

This phenomenon is known as viscoelastic creep. At a time t 0 , a viscoelastic material is loaded with a constant stress that is maintained for a sufficiently long time period.

The material responds to the stress with a strain that increases until the material ultimately fails.

When the stress is maintained for a shorter time period, the material undergoes an initial strain until a time t 1 at which the stress is relieved, at which time the strain immediately decreases discontinuity then continues decreasing gradually to a residual strain.

Viscoelastic creep data can be presented in one of two ways. Total strain can be plotted as a function of time for a given temperature or temperatures.

Below a critical value of applied stress, a material may exhibit linear viscoelasticity. Above this critical stress, the creep rate grows disproportionately faster.

The second way of graphically presenting viscoelastic creep in a material is by plotting the creep modulus constant applied stress divided by total strain at a particular time as a function of time.

A family of curves describing strain versus time response to various applied stress may be represented by a single viscoelastic creep modulus versus time curve if the applied stresses are below the material's critical stress value.

Additionally, the molecular weight of the polymer of interest is known to affect its creep behavior. The effect of increasing molecular weight tends to promote secondary bonding between polymer chains and thus make the polymer more creep resistant.

Similarly, aromatic polymers are even more creep resistant due to the added stiffness from the rings.

Both molecular weight and aromatic rings add to polymers' thermal stability, increasing the creep resistance of a polymer.

Both polymers and metals can creep. Polymers experience significant creep at temperatures above ca.

Polymers show creep basically in two different ways. Wood is considered as an orthotropic material, exhibiting different mechanical properties in three mutually perpendicular directions.

Experiments show that the tangential direction in solid wood tend display a slightly higher creep compliance than in the radial direction.

It has also been shown that there is a substantial difference in viscoelastic properties of wood depending on loading modality creep in compression or tension.

Studies has shown that certain Poisson's ratios gradually go from positive to negative values during the duration of the compression creep test, which does not occur in tension.

The creep of concrete, which originates from the calcium silicate hydrates C-S-H in the hardened Portland cement paste which is the binder of mineral aggregates , is fundamentally different from the creep of metals as well as polymers.

Unlike the creep of metals, it occurs at all stress levels and, within the service stress range, is linearly dependent on the stress if the pore water content is constant.

Unlike the creep of polymers and metals, it exhibits multi-months aging, caused by chemical hardening due to hydration which stiffens the microstructure, and multi-year aging, caused by long-term relaxation of self-equilibrated micro-stresses in the nano-porous microstructure of the C-S-H.

If concrete is fully dried it does not creep, though it is difficult to dry concrete fully without severe cracking.

Though mostly due to the reduced yield strength at higher temperatures, the collapse of the World Trade Center was due in part to creep from increased temperature.

The creep rate of hot pressure-loaded components in a nuclear reactor at power can be a significant design constraint, since the creep rate is enhanced by the flux of energetic particles.

Creep in epoxy anchor adhesive was blamed for the Big Dig tunnel ceiling collapse in Boston, Massachusetts that occurred in July The design of tungsten light bulb filaments attempts to reduce creep deformation.

Sagging of the filament coil between its supports increases with time due to the weight of the filament itself.

If too much deformation occurs, the adjacent turns of the coil touch one another, causing an electrical short and local overheating, which quickly leads to failure of the filament.

The coil geometry and supports are therefore designed to limit the stresses caused by the weight of the filament, and a special tungsten alloy with small amounts of oxygen trapped in the crystallite grain boundaries is used to slow the rate of Coble creep.

Creep can cause gradual cut-through of wire insulation, especially when stress is concentrated by pressing insulated wire against a sharp edge or corner.

Special creep-resistant insulations such as Kynar polyvinylidene fluoride are used in wirewrap applications to resist cut-through due to the sharp corners of wire wrap terminals.

Teflon insulation is resistant to elevated temperatures and has other desirable properties, but is notoriously vulnerable to cold-flow cut-through failures caused by creep.

Hence, it is crucial for correct functionality to understand the creep deformation behavior of materials. Creep deformation is important not only in systems where high temperatures are endured such as nuclear power plants, jet engines and heat exchangers, but also in the design of many everyday objects.

For example, metal paper clips are stronger than plastic ones because plastics creep at room temperatures. While glass does exhibit creep under the right conditions, apparent sagging in old windows may instead be a consequence of obsolete manufacturing processes, such as that used to create crown glass , which resulted in inconsistent thickness.

Fractal geometry, using a deterministic Cantor structure, is used to model the surface topography, where recent advancements in thermoviscoelastic creep contact of rough surfaces are introduced.

Various viscoelastic idealizations are used to model the surface materials, including the Maxwell, Kelvin—Voigt, standard linear solid and Jeffrey models.

Nimonic 75 has been certified by the European Union as a standard creep reference material. The practice of tinning stranded wires to facilitate the process of connecting the wire to a screw terminal , though having been prevalent and considered standard practice for quite a while, has been discouraged by professional electricians, [28] owing to the fact that the solder is likely to creep under the pressure exerted on the tinned wire end by the screw of the terminal, causing the joint to lose tension and hence create a loose contact over time.

The accepted practice when connecting stranded wire to a screw terminal is to use a wire ferrule on the end of the wire.

Generally, materials have better creep resistance if they have higher melting temperatures, lower diffusivity, and higher shear strength.

Close-packed structures are usually more creep resistant as they tend to have lower diffusivity than non-close-packed structures.

Common methods to reduce creep include:. Superalloys based on Co, Ni, and Fe have been engineered to be highly resistant to creep. Carbides are also used in polycrystalline superalloys to inhibit grain boundary sliding.

They can be used for solid solution strengthening, to reduce the formation of undesirable brittle precipitates, and to increase oxidation or corrosion resistance.

Ni-based superalloys have found widespread use in high-temperature, low stress applications. From Wikipedia, the free encyclopedia. Tendency of a solid material to move slowly or deform permanently under mechanical stress.

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources.

Unsourced material may be challenged and removed. Main article: Deformation mechanism map. Main article: Dislocation creep.

Main article: Nabarro—Herring creep. Main article: Coble creep. Main article: Creep and shrinkage of concrete. Main article: Superalloys.

Biomaterial Biomechanics Ductile—brittle transition temperature in materials science Deformation mechanism Downhill creep Hysteresis Larson—Miller parameter Stress relaxation Viscoelasticity Viscoplasticity.

Archived from the original on Retrieved Encyclopedia Britannica. Oxford: Elsevier. Understanding creep—a review. Metall and Mat Trans A 33, — Kassner, T.

Creep cavitation in metals. In: Bradt R. NC State University. April Metallurgical Transactions. Progress in Materials Science. October Creep of crystals.

High-temperature deformation processes in metals, ceramics and minerals. Cambridge University Press.

Crystal Research and Technology. Acta Metallurgica. Mechanical behavior of materials 2nd ed. Boston: McGraw Hill.

The Philosophical Magazine. Modern Developments in Powder Metallurgy. Springer, Boston, MA. November Kluwer Academic Publishers. Meyers; K.

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