一种非线性应力应变关系表达式及应用

An Expression of Nonlinear Stress-strain Relation and Its Application

把一般非线性应力应变关系分成线性部分和偏离这部分的非线性部分，前者用线性关系式即虎克定律描述，后者用幂次关系式描述作为前者的修正。此表达式避免了加载瞬时模量为无穷大，更符合实际。讨论了表达式中参数的确定，并应用于软土非线性流变本构关系中。

described by the linear relation,and nonlinear part described by power relation. Theexpressioii can avoid the initial module beiiig inflnite,which gets closer to practical facts. The determination of the parameters in the expression is discussed. FInally,anonlinearly rheological constitutive relation of a clay is established with the application ofthis method.