冲击载荷下脂肪层的压缩性能
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国家自然科学基金项目(11872215),国防基础科研项目(JCKYS201909C001),军委科技委基础加强计划技术领域基金(2020-JCJQ? JJ-403,2019-JCJQ?JJ-373)


Compression Properties of Fat Layer under Impact Loading
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    摘要:

    目的 对脂肪的动态压缩性能开展研究,进一步揭示损伤机制,为医疗救治提供参考。方法 基于改进的霍普金森杆(split Hopkinson pressure bar,SHPB)实验装置,对猪脂肪进行动态压缩实验,测量脂肪组织在不同应变率下的应力-应变曲线;对脂肪组织SHPB实验过程进行仿真分析;开展直径32 mm橡胶非致命弹侵彻人体腹部模拟靶标过程的数值模拟。结果 脂肪组织具有明显的应变率效应,两组高应变率下的应力-应变曲线近似为直线且斜率相近,弹性模量为3.25 MPa,约为准静态时的6倍;脂肪SHPB仿真曲线和实验曲线基本吻合,验证了所采用本构模型的正确性;非致命弹侵彻人体腹部过程中,皮肤表面出现了类似“水波”的环形凸起区域,脂肪层吸收了约67%的冲击动能。结论 脂肪组织的实验数据较为准确。数值模拟可以很好再现侵彻过程,为非致命武器对人体损伤效应的研究提供参考。

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    Objective To study dynamic compression performance of adipose tissues, so as to further reveal the damage mechanism, and provide references for medical treatment.Methods Based on the improved split Hopkinson pressure bar (SHPB) experimental device, the adipose tissue dynamic compression experiment was conducted. The stress-strain curves of adipose tissues at different strain rates were obtained. Then the numerical model of SHPB was established, and the experimental process was simulated and analyzed. The numerical simulation for penetration process of 32 mm diameter rubber non-lethal projectile into the simulated target in human abdomen was carried out.Results Adipose tissues had a noticeable strain rate effect. The stress-strain curves at two high strain rates were approximately straight lines. The slope was similar, and the elastic modulus was 3.25 MPa, which was about 6 times of that under a quasi-static state. The simulation curves of fat SHPB were consistent with the experimental curves, which verified correctness of the constitutive model. In the process of non-lethal projectile penetrating human abdomen, an annular convex area similar to water wave appeared on skin surface, and the fat layer absorbed about 67% of the impact kinetic energy.Conclusions The experimental data of adipose tissues are very accurate. Numerical simulation can reproduce the penetration process well, and provide references for studying the damaging effect of non-lethal weapons on human body.

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刘荣华,温垚珂,闫文敏,鲍振宇,董方栋,周俊羽.冲击载荷下脂肪层的压缩性能[J].医用生物力学,2022,37(2):238-243

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  • 收稿日期:2021-07-14
  • 最后修改日期:2021-09-15
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  • 在线发布日期: 2022-04-27
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