Publication

Strain softening behavior in a particle-containing copper alloy

2010
Journal Articles

Résumé

The strain softening behavior of a particle-containing copper alloy and the associated microstructure changes were investigated as a function of strain rate (epsilon) over dot and analyzed by modeling. It is shown that, increasing strain rate (epsilon) over dot favors the multiple peak type behavior for flow stress and the appearance of strain softening behavior. During the ambient compression, the fiber structure, dislocation density and dislocation cell size and shape were also changed significantly with increasing of strain rates (epsilon) over dot. The transition from strengthening to softening was explained in terms of generation and annihilation of dislocations within dislocation cells or at cell boundaries. A new constitutive equation was developed to well describe the strain softening in the particle-containing alloy compressed at different strain rates. (C) 2010 Elsevier B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/9c2a5fdd-8654-49d6-b6ea-578f66b4f29b

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2010
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/9c2a5fdd-8654-49d6-b6ea-578f66b4f29b

À propos de ce résultat

Concepts associés (32)

Strain-rate tensor

In continuum mechanics, the strain-rate tensor or rate-of-strain tensor is a physical quantity that describes the rate of change of the deformation of a material in the neighborhood of a certain point, at a certain moment of time. It can be defined as the derivative of the strain tensor with respect to time, or as the symmetric component of the Jacobian matrix (derivative with respect to position) of the flow velocity. In fluid mechanics it also can be described as the velocity gradient, a measure of how the velocity of a fluid changes between different points within the fluid.

Stress–strain curve

In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing). These curves reveal many of the properties of a material, such as the Young's modulus, the yield strength and the ultimate tensile strength. Generally speaking, curves representing the relationship between stress and strain in any form of deformation can be regarded as stress–strain curves.

Tension de cycle

En chimie organique, la tension de cycle ou contrainte cyclique désigne la déstabilisation d'une molécule cyclique, telle un cycloalcane, causée par l'orientation spatiale des atomes qui la composent. Cette tension provient d'une combinaison (1) de contrainte d'angle, (2) de contrainte de torsion (ou tension de Pitzer) et (3) de la tension trans-annulaire (ou contrainte de van der Waals).

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Publications associées (32)

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Strain softening behavior in a particle-containing copper alloy

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