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首页> 外文会议>Proceedings of the ASME international mechanical engineering congress and exposition 2009 >DYNAMIC MECHANICAL RESPONSE OF RENAL CORTEX UNDER COMPRESSION: STRAIN-RATE EFFECT
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DYNAMIC MECHANICAL RESPONSE OF RENAL CORTEX UNDER COMPRESSION: STRAIN-RATE EFFECT

机译：压缩状态下肾皮质的动力力学响应：应变率效应

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The body armor can protect the soldiers from penetrating and blunt injury during the war, but its prevention standard lacks the biomedical validity. To improve the protection gear and prevention strategies, we need valid input data in mathematical modeling at different impact loading conditions. Our aim is to provide the valid data for the computer modeling and simulation based on the injury levels. Dynamic mechanical behaviors of kidney tissues are needed as input data for the impact modeling of penetrating injury. Moreover, the knowledge of mechanical responses of kidney tissues is important for diagnosis, surgical simulation and training purposes. This work investigates the impact of strain rate effect of kidney tissue under compression. The dynamic response of kidney tissues is studied using Split Hopkinson pressure bar (SHPB) technique. We have modified the classical SHPB technique to characterize the mechanical behavior of kidney tissues at high strain-rate ranging from 1000 s~(-1) to 3000 s~(-1) by incorporating quratz-crystal technique and hollow transmission bar. We have also studied the quasi-static response of kidney tissues at three different strain-rates of 0.01 s~(-1), 0.1 s~(-1) and 1 s~(-1) as well as the intermediate strain rate at two different strain rates of 10 s~(-1) and 100s~(-1) .The experiment results indicate the non-linear stress-strain response of materials. The kidney tissue stiffens evidently with increasing strain-rate.
机译：防弹衣可以保护士兵免受战争期间的穿透和钝器伤害，但其防护标准缺乏生物医学有效性。为了改善防护装备和预防策略，我们需要在不同冲击载荷条件下进行数学建模时需要有效的输入数据。我们的目标是根据伤害水平为计算机建模和仿真提供有效数据。需要肾脏组织的动态力学行为作为穿透性损伤影响模型的输入数据。此外，肾组织机械反应的知识对于诊断，手术模拟和训练目的很重要。这项工作调查了肾组织在压缩状态下的应变率效应的影响。使用Split Hopkinson压力棒（SHPB）技术研究肾脏组织的动态响应。我们已经修改了经典的SHPB技术，以结合quratz晶体技术和空心传输棒来表征从1000 s〜（-1）到3000 s〜（-1）的高应变率肾脏组织的力学行为。我们还研究了在0.01 s〜（-1），0.1 s〜（-1）和1 s〜（-1）三种不同应变率下肾脏组织的准静态响应以及在两种不同的应变率分别为10 s〜（-1）和100s〜（-1）。实验结果表明了材料的非线性应力应变响应。肾脏组织随着应变率的增加而明显变硬。

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