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显式有限元可以不生成单元刚度矩阵,因而无法采用刚度矩阵计算刚度阻尼。参照隐式有限元刚度阻尼的生成方法,并考虑显式有限元的计算原理,研究了通过材料本构实现刚度阻尼的方法和程序计算流程;进而针对三维梁元研究了刚度阻尼系数对稳定时间步长的影响规律,确定了折减系数与阻尼系数和单元特征长度的对应关系。数值计算表明,刚度阻尼严重降低稳定时间步长,对于结构显式动力分析不建议采用刚度阻尼,在需要考虑阻尼影响时建议采用质量阻尼。
The explicit finite element can not generate the element stiffness matrix and thus can not be used to calculate the stiffness damping. With reference to the generation method of implicit finite element stiffness damping and considering the explicit finite element calculation principle, the method of stiffness damping and the program calculation flow through the material constitutive are studied. Furthermore, the effect of stiffness damping coefficient on the stability time The influence law of the step length, the corresponding relationship between the reduction coefficient and the damping coefficient and the unit feature length is determined. Numerical calculations show that stiffness damping seriously reduces the steady time step, stiffness damping is not recommended for structural explicit dynamic analysis, and mass damping is recommended when damping effects need to be considered.