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首页> 外文期刊>International Journal of Solids and Structures >Compression response of a thermoplastic elastomer gel tissue surrogate over a range of strain-rates
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Compression response of a thermoplastic elastomer gel tissue surrogate over a range of strain-rates

机译：热塑性弹性体凝胶组织在一系列应变率下的压缩响应

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摘要

The mechanical response of a thermoplastic elastomer synthetic ballistic gel is studied over a range of strain-rates. Experiments were conducted at room temperature under uniaxial stress compression at rates ranging from 0.001 to 500/s. Low-rate experiments (<1/s) were conducted with a servo-hydraulic load frame. High-rate experiments (>100/s) were conducted with a polymeric Kolsky bar, along with several modifications to improve data quality. These modifications include the use of a commercial force transducer, a normal displacement interferometer, and a line laser extensometer. Because of the low shear strength and comparatively high compressibility of these materials, inertial effects are very pronounced. Specimen size is varied in an effort to study inertial effects at various loading rates. High speed photography is also used to demonstrate the presence of non-uniform deformation, due to both inertia and friction between the specimen and the loading surfaces. Finally, numerical simulation is used to verify trends observed in the experiments and further validate the data. It is concluded that this material is rate sensitive, with an almost three-fold increase in stiffness over the range of strain-rates studied.
机译：在一定的应变速率范围内研究了热塑性弹性体合成防弹凝胶的机械响应。实验是在室温下在单轴应力压缩下以0.001至500 / s的速率进行的。在伺服液压负载架上进行了低速实验（<1 / s）。使用聚合物Kolsky条进行了高速实验（> 100 / s），并进行了一些改进以提高数据质量。这些修改包括使用商用力传感器，法向位移干涉仪和线性激光引伸计。由于这些材料的低剪切强度和较高的可压缩性，惯性效应非常明显。为了研究各种载荷率下的惯性效应，试件的大小有所变化。高速摄影还用于演示由于样本与加载表面之间的惯性和摩擦而导致的不均匀变形。最后，使用数值模拟来验证实验中观察到的趋势并进一步验证数据。结论是，这种材料对速率敏感，在所研究的应变速率范围内，刚度几乎增加了三倍。

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