coefficient of strain

coefficient of strain

[¦kō·ə′fish·ənt əv ′strān]
(mathematics)
Multiplier used in transformations to elongate or compress configurations in a direction parallel to an axis.
(mechanics)
For a substance undergoing a one-dimensional strain, the ratio of the distance along the strain axis between two points in the body, to the distance between the same points when the body is undeformed.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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where [sigma] is flow stress, A is the yield stress at reference temperature and strain rate, B is the coefficient of strain hardening, n is the exponent of strain hardening, [epsilon] is the true strain, [??]* = [??]/[[??].sub.ref] is the dimensionless strain rate with [??] being the strain rate ([s.sup.-1]), [[??].sub.ref] the reference strain rat ([s.sup.-1]), and T* is homologous temperature, expressed as:
C and m are material constants that represent the coefficient of strain rate hardening and thermal softening exponent, respectively.
where [[sigma].sub.s] is the Von Mises equivalent flow stress (MPa), A is the yield stress at a given reference temperature and a given reference strain rate, B is the coefficient of strain hardening, C is the coefficient of strain rate hardening, n is the strain hardening exponent, [[epsilon].sup.p] is the equivalent plastic strain, and [mathematical expression not reproducible] is the dimensionless strain rate with [??] being the strain rate and [[??].sub.0] the reference strain rate.

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