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| Discussion of the effect of tensile control model and tensile rate on strain hardening exponent (n-value) |
| TAN Hong-Feng |
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Abstract The effect of different tensile control model on strain hardening exponent(n-value) was analyzed on the basis of Hollomon formula. The effect of tensile rate on n-value was also discussed by simple tensile test. It is indicated that from the study: 1)the strain hardening exponent is not a constant but a variable being relevant with the control model; 2) Since plastic deformation of polycrystalline metal is time-dependent, the n-value decreases with increasing the tensile rate . 3) It is suggested to use the strain rate control model at tensile step of uniform plastic deformation. As the tensile test is static loading test, it��s more close to the true value for low tensile rate.
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Received: 24 June 2010
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Corresponding Authors:
TAN Hong-Feng
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2010, Vol. 28 
