| Citation: | LUO Ting, SHU Wenjun, YAO Yangpinget al. Element failure correction method for UH model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(4): 667-675. doi: 10.13700/j.bh.1001-5965.2016.0321(in Chinese)
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The problem of some elements' damage often appears when finite element calculation of using UH model UMAT is conducted, including tension failure and shear failure. The failure stress state not only makes the results unreasonable, but also reduces the stability of calculation. To solve the problem generated by unreasonable failure stress state when the UH model's UMAT is used to conduct finite element analysis, based on certain assumptions and combined with stress transformation relationship under different coordinates, three-dimensional element failure correction formulas for UH model can be elicited. Then FORTRAN language is used to write the subroutine of element failure correction, and it is embedded in the UH model's UMAT to eliminate the unreasonable failure stress state and improve the stability of finite element calculation. Finally, an example of foundation pit excavation is used to verify the validity and rationality of this method.
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