Mechanical analysis of the strain-hardening exponent under tensile deformation

• 作 者: 宋玉泉\\r\\r\\r\\r\\r\\r\\r\\r\\r\\n 海锦涛\\r\\r\\r\\r\\r\\r\\r\\r\\r\\n 管志平
• 出 处: Science in China(Series E:Technological Sciences)
• 发表日期: 2001年06期
• 关键词: hardening tensile exponent plasticity essence variational entirely precise coord

It has been experimentally proved that strain hardening exponent has very strong sensitivity to structure. The measuring result of precise experiment indicated that the variational laws of nv(the strain hardening exponent under constant velocity), nε( under constant strain rate) and np( under constant load) with ε strain are entirely different. Considering the structure sensitivity in superplasticity and plasticity (which means that the strain hardening exponent is related to strain as well as strain rate), this paper deduces the analytical expressions for nv, nε and np from the state equation. Thus, the mechanical essence of nv, nε and np corresponding the change of e is revealed. And the experimental results on typical material Zn 5%AI are interpreted successfully which show reliability of the theory.

It has been experimentally proved that strain hardening exponent has very strong sensitivity to structure. The measuring result of precise experiment indicating that the variational laws of nv (the strain hardening exponent under constant velocity), nε (under constant strain rate) and np (under Considering the structure sensitivity in superplasticity and plasticity (which means that the strain hardening exponent is related to strain as well as strain rate), this paper deduces the analytical expressions for nv, nε and np from the mechanical properties of nv, nε and np correspond to the change of e is revealed. And the experimental results on e materialized Zn 5% AI are interpreted successfully which show reliability of the theory.