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当滑动摩擦力存在时,准静态过程是不可逆的。考虑这样一个例子,一个装着气体的圆筒、圆筒上装有活塞,且活塞的滑动摩擦力不能忽略的情况,假定摩擦力是温度、位移和运动方向的函数、从系统边界度量、确定能量作为温度和体积的函数是可能的,可是按照热力学的考虑,既使在大量可能迭择上,加上若干限制,力和熵也不是唯一被确定的。本文对布里奇曼提出的推广熵的定义只是按照结论方式讨论。此外,对这个模型和完全塑性物质之间的可能性类似也做了简要的讨论。
When the sliding friction exists, the quasi-static process is irreversible. Consider the case of a gas-filled cylinder with a piston on the cylinder and a sliding frictional force of the piston that can not be ignored. Assuming that the frictional force is a function of temperature, displacement and direction of motion, the energy is determined from the system boundary as As a function of temperature and volume it is possible, however thermodynamically considered, forces and entropies are not uniquely identified, even though there are a number of limitations on the number of possible iterations. In this paper, the definition of extended entropy proposed by Bridgman is only discussed according to the conclusion. In addition, a brief discussion of the similarities between this model and complete plasticity is also provided.