一种适用于肌肉高应变率下主被动特性数值计算模型

Numerical Model for Calculating Active and Passive Properties of Muscles with High Strain Rate

目的在显式动力学计算理论基础上,提出一种适用于肌肉高应变率下主被动特性数值计算模型。方法在计算肌肉单元高应变率下运动方程的过程中,于每一时间步计算节点力公式中引入高应变率下的Hill肌肉三元素计算模型,对每一时间步的节点力进行修正。结果由于在数值计算过程中引入Hill肌肉三元素模型,使得肌肉单元具有一般结构本构模型的被动特性和其专有的主动特性。结论研究结果有助于对肌肉高应变率下的动力学响应和损伤问题进行数值计算。

Objective On the basis of explicit dynamics calculation theory,a numerical model for calculating active and passive properties of muscles with high strain rate was proposed. Methods In the process of calculating the motion equation of muscle element with high strain rate,Hill’s three-factor muscle model with high strain rate was introduced into the noda force formula to modify the node force in each time step. Results As Hill’s three-factor muscle model was introduced in numerical calculation,the muscle element had the passive characteristics of the general structural constitutive model and its proprietary active characteristics. Conclusions The research findings will contribute to numerical calculation for dynamic response and damage of muscles with high strain rate.