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揭示了有限元模型中低碳钢的真实应力-应变关系。从一系列长宽比不同的构件的拉伸试验中得出了这些应力-应变关系。不同于工程应力-应变关系,真实的应力-应变关系与构件的几何特性是无关的。光学测量的使用将真实应力和应变与有限单元长度联系起来,这是因为应变的参考长度已成为像素尺寸的一个函数。真实的应力-应变关系被用于板的冲击试验的有限元模拟。将基于有限单元长度的破坏应变作为一个应变常量应用于板和拉伸试验的破坏准则,从三轴破坏试验中测量得到。
The real stress-strain relationship of mild steel in finite element model is revealed. These stress-strain relationships are derived from a series of tensile tests of different aspect ratio members. Unlike the engineering stress-strain relationship, the true stress-strain relationship is independent of the geometry of the component. The use of optical measurements relates the true stress and strain to the finite element length because the reference length of the strain has become a function of pixel size. The true stress-strain relationship is used for finite element simulation of plate impact tests. The failure criterion based on the finite element length was applied as a strain constant to the failure criterion of the plate and tensile test and was measured from the triaxial failure test.