黏塑性本构计算的稳定性分析
发布时间:2018-12-19 08:58
【摘要】:提出本构方程计算方法的稳定性问题,针对黏塑性本构计算的显式精确算法的稳定性进行分析,发现该算法并非无条件稳定,使用小扰动方法给出了其计算稳定的必要条件,稳定性条件对数值计算中的时间步长提出限制要求。通过有限元算例验证了分析的正确性,计算结果也表明理论推导得到的稳定性公式能够准确预测满足计算稳定性条件要求的最大时间步长与各参数之间关系。
[Abstract]:The stability problem of constitutive equation calculation method is presented. The stability of explicit exact algorithm for visco-plastic constitutive calculation is analyzed. It is found that the algorithm is not unconditionally stable, and the necessary condition for its computational stability is given by using small perturbation method. The stability condition limits the time step in numerical calculation. The correctness of the analysis is verified by a finite element example, and the calculated results show that the stability formula derived by the theory can accurately predict the relationship between the maximum time step and the parameters that meet the requirements of the computational stability condition.
【作者单位】: 中国工程物理研究院流体物理研究所;中国科学技术大学近代力学系;
【基金】:国家自然科学基金项目(11602250) 中国工程物理研究院流体物理研究所发展基金项目(SFZ201401(04)02)
【分类号】:O344.1
本文编号:2386700
[Abstract]:The stability problem of constitutive equation calculation method is presented. The stability of explicit exact algorithm for visco-plastic constitutive calculation is analyzed. It is found that the algorithm is not unconditionally stable, and the necessary condition for its computational stability is given by using small perturbation method. The stability condition limits the time step in numerical calculation. The correctness of the analysis is verified by a finite element example, and the calculated results show that the stability formula derived by the theory can accurately predict the relationship between the maximum time step and the parameters that meet the requirements of the computational stability condition.
【作者单位】: 中国工程物理研究院流体物理研究所;中国科学技术大学近代力学系;
【基金】:国家自然科学基金项目(11602250) 中国工程物理研究院流体物理研究所发展基金项目(SFZ201401(04)02)
【分类号】:O344.1
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