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从拉伸变形的状态方程和力学基本理论出发，导出了塑性和超塑性拉伸变形ｍξ、ｍｖ 和ｍＦ（ｍξ、ｍｖ。和Ｆ分别为恒应变ξ、恒变形速度ｖ和恒载荷Ｆ的应变速率敏感性指数）的函数表达式，而且理论计算值与典型超塑性合金ＺｎＡ１５的试验数据吻合，这便从理论上解答了“拉伸变形应变速率敏感性指数的力学涵义及其规范测量”一文从试验上提出的问题，即：为什么ｍξ、ｍｖ和ｍＦ随应变速率ξ的变化规律互不相同，甚至出现了ｍＦ会大于１，ｍｖ会是负值的反常结果。对这些问题的理论解答便进一步揭示了ｍ值的力学本质。
Based on the equation of state of tension and deformation and the basic theory of mechanics, the strains of plastic and superplastic tensile deformation mξ, mv and mF (mξ, mv. And F are constant strain ξ, constant deformation velocity v and constant load F respectively) Rate sensitivity index), and the theoretical calculated value is consistent with the experimental data of a typical superplastic alloy ZnA15, which theoretically answers the article “Mechanical Connotation of Tensile Deformation Rate Sensitivity Index and Its Normative Measurement” The questions raised from the experiment, namely: why mξ, mv and mF change with different strain rates ξ, and even mF will be greater than 1, mv will be an anomalous result of negative values. The theoretical answer to these questions further reveals the mechanical nature of m.