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Exact(29)
μ is the tension hardening coefficient.
The work hardening coefficient decreased with the increase of strain.
The uniform elongation and the strain hardening coefficient decrease gradually when the strain rate increases.
where k is an arbitrary constant and n is the Meyer's index, also known as work hardening coefficient.
The analysis also revealed that the material hardening coefficient had the most significant influence on the formability characteristics during hydroforming.
However, the decrease of work hardening coefficient with increasing strain rate did not follow a similar trend.
Similar(31)
The results point that the self-hardening coefficients (diagonal matrix components) are greater in magnitude than the latent hardening coefficients (off-diagonal components).
In addition to that, the value of strain hardening coefficients such as instantaneous strength coefficient (ki) and instantaneous strain hardening exponent (ni) is also simulated to find the effect of particle size and the percent of iron content on formability.
Very high strain hardening coefficients (=G/23) are observed for aluminum-alloyed face-centered cubic Hadfield steel single crystals under tensile loading.
It was found that for material properties, in the semi-infinite zone of indentation, the cohesion has the largest influence on indentation pressure, followed by one of the the hardening coefficients.
A recently proposed technique combines the traditional indentation test with the mapping of the residual deformations (imprint), thus providing experimental data apt to identify isotropic material parameters in more accurate fashion and in larger number, including Poisson's ratio, hardening coefficients, friction between the specimen and the indentation tool.
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