Abstract: According to the energy principle, theoretical relationship formula of yield strength in respect of physical and mechanical properties, such as elongation, elastic modulus, density, Molar quality, Molar heat capacity, Molar melting heat, melting point and deformation temperature etc. has been derived. Yield strength calculated from the formula shows good accordance with experimental data of 40 kinds of materials.

Key words: 变形, 计算方法, 屈服强度