基于可行方向法的脂肪组织本构模型参数反求优化研究
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天津科技大学

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Reverse and optimization of constitutive parameters of adipose tissue based on feasible direction method
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    摘要:

    目的 研究脂肪组织在中等应变率下本构模型及其参数反求。方法 基于脂肪组织力学性能试验,通过有限元方法重构了脂肪组织压缩实验,并对常见表征脂肪组织的本构模型进行了参数筛选,结合最优化方法中的可行方向法(MFD)探讨了中应变率时脂肪组织本构模型相关参数的反求。结果 发现中应变率(260s-1)时粘弹性本构模型相比Ogden本构模型更适合表征脂肪组织的力学响应,并反求得到了适用于仿真的本构模型参数。结论 中等应变率下粘弹性本构模型更适合表征脂肪组织力学响应,研究结果可为汽车碰撞有限元仿真中研究人体脂肪组织对人体损伤的影响提供参考。

    Abstract:

    Aim The constitutive model of adipose tissue under medium strain rate and its parameter inversion are studied.Method Based on the published mechanical properties experiments of adipose tissue, the compression experiment of adipose tissue was reconstructed by finite element method, and the parameters of constitutive models of adipose tissue were discussed. Combined with the feasible direction method (MFD) of optimization method, the reverse calculation of parameters of fat tissue constitutive model at medium strain rate was discussed. Results Compared with Ogden constitutive model,the viscoelastic model was more suitable for characterizing the mechanical response at medium strain rate (260s-1). And the parameters of the constitutive model suitable for simulation are obtained using reverse method. Conclusions The viscoelastic model was more suitable for characterizing the mechanical response at medium strain rate. The results can be helpful to study the influence of human adipose tissue on human body injury using finite element simulation in the vehicle collisions.

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  • 收稿日期:2020-10-26
  • 最后修改日期:2020-12-30
  • 录用日期:2021-01-05
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