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由于弹性学的热力学函数不能对塑性学推广,本文用以位错为基础的热力学函数反映了塑性现象的位错实质,并以此热力学函数建立了金属恒温弹塑性力学过程的热力学基本方程,即赫姆霍兹自由能变化dF_T的熵产生表达、耗散表达及熵产生与耗散之间的关系;对于恒温弹塑性应力-应变循环,证明了无论它是否为热力学循环,循环功都是正塑性功,加载功常大于卸载功;对于热力学循环,塑性功全部耗散;对于非热力学循环,因自由能永动机不存在,塑性功未全部耗散.本文理论很可能为金属塑性力学过程研究提供一个不可逆过程热力学基础.
Since the thermodynamic function of elasticity can not be generalized to plasticity, the thermodynamic function based on dislocation reflects the dislocation essence of plastic phenomena. Based on this thermodynamic function, the basic thermodynamic equation of the thermo-plastic mechanical process of metal is established, that is, Hermholtz free energy changes the expression of dF_T entropy generation, the expression of dissipation and the relationship between entropy generation and dissipation; for the thermo-plastic elastic-stress-strain cycle, it is proved that whether it is a thermodynamic cycle or not, For the non-thermodynamic cycle, due to the free perpetual motion machine does not exist, the plastic work is not all dissipated.This theory is likely to provide for the research of metal-plastic mechanics process An irreversible process based on thermodynamics.