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MISC

Comparison explicit and implicit time integrations

显式算法 隐式算法
适用问题 动力学(动态) 静力学(静态)和动力学(动态)
阻尼 人工阻尼 数值阻尼
时间步求解方法 矩阵乘法 线性方程组
组装刚度矩阵
数据存储需求
每步计算速度
迭代收敛性
确定性 有确定解 可能是病态无确定解
时间稳定性 有条件 无条件
时间步
计算精度
Explicit method Implicit method
Target problems Dynamic(transient) Static and dynamic(transient)
Damping Artificial damping Numerical damping
Time stepping method Matrix multiplication Linear algebra equations
Assemble stiffness matrix No Yes
Data storage requirement Small Large
Solving speed each step Quick Mediate
Iteration convergence No Yes
Solution Certain solution Could be uncertain solution
Stability Conditionally stable Unconditionally stable
Time step Small Large
Accuracy Low High
应力-应变曲线含有 适用的Mooney-Rivlin函数 参数正定性要求
没有拐点(单曲率) 2-或3-参数 C10 + C01 > 0
1个拐点(双曲率) 5-参数

C10 + C01 > 0
C20 > 0
C02 < 0
C20 + C11 + C02 > 0

2个拐点 9-参数

C10 + C01 > 0
C30>0
C03 < 0
C30 + C21 + C12 + C03 > 0

Strain-stress curve Suitable Mooney-Rivlin model Parameter requirement for positive definiteness
No inflection point (single curvature) 2- or 3-parameter C10 + C01 > 0
One inflection point (double curvature) 5-parameter

C10 + C01 > 0
C20 > 0
C02 < 0
C20 + C11 + C02 > 0

Two inflection points 9-parameter

C10 + C01 > 0
C30>0
C03 < 0
C30 + C21 + C12 + C03 > 0