行人腿型冲击器肌肉材料参数反求

aPLI先进行人腿型冲击器在碰撞测试中的生物仿真度，在很大程度上取决于其几何结构及其模拟腿部肌肉的合成橡胶的超弹性力学特性。根据橡胶准静态单轴压缩试验数据，分别对用于表述橡胶超弹性的Ogden和Mooney-Rivlin本构模型进行材料参数拟合，得到相应的材料参数并将拟合曲线与试验曲线进行比较，对比不同本构模型的拟合精度。结果表明，2阶 Ogden材料模型更符合试验结果。为提高有限元模型中肌肉橡胶材料参数的准确性，重构压缩试验有限元模型，以拟合得到的2阶Ogden本构模型材料参数为初始值，通过将有限元与优化策略相结合，基于自适应响应面法对2阶Ogden模型中μ1、α1、μ2、α2这4个材料参数进行优化，获得该材料在准静态压缩状态下的一组最佳材料参数。

Inverse Calculation of Muscle Material Parameters for the Pedestrian Legform Impactor

The biological fidelity of the advanced Pedestrian Legform Impactor(aPLI) in crash testing largely depends on its geometric structure and the hyperelastic mechanical properties of synthetic rubber used to simulate leg muscle. Based on the quasi-static uniaxial compression test data of rubber, both Ogden and Mooney Rivlin constitutive models are fitted to characterize the hyperelastic behavior of rubber. Following this, the material parameters are obtained and fitting curves are compared with the experimental curves to assess the accuracy of different constitutive models. The results show that the outcomes of the second-order Ogden model better match the experimental data. To increase the accuracy of muscle rubber material parameters in the finite element model, a compression test finite element model is reconstructed. Taking the material parameters of the fitted second-order Ogden constitutive model as the initial values, an optimization of the material parameters, μ1, α1, μ2 and α2 in the model is performed using the adaptive response surface method combined with finite element analysis and optimization strategies. This yields a set of optimal material parameters for the material under quasi-static compression.