We present a one-dimensional, multiscale mass-spring model to describe the response of vertically aligned carbon nanotube (VACNT) foams subjected to uniaxial, high-rate compressive deformations. The model uses mesoscopic dissipative spring elements composed of a lower level chain of asymmetric, bilateral, bistable elastic springs to describe the experimentally observed deformation-dependent stress–strain responses. The model shows an excellent agreement with the experimental response of VACNT foams undergoing finite deformations and enables in situ identification of the constitutive parameters\udat the smaller lengthscales. We apply the model to two cases of VACNT foams impacted at 1.75 ms^-1 and 4.44 ms^-1 and describe their dynamic response.
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机译:我们提出一维,多尺度质量弹簧模型来描述垂直排列的碳纳米管(VACNT)泡沫承受单轴,高速压缩变形的响应。该模型使用由低级不对称,双侧,双稳态弹性弹簧链组成的介观耗散弹簧元件来描述实验观察到的变形相关应力-应变响应。该模型显示了与VACNT泡沫有限变形的实验响应的极好的一致性,并且能够对本构参数进行原位识别,即使长度尺度较小。我们将该模型应用于VACNT泡沫在1.75 ms ^ -1和4.44 ms ^ -1受到影响的两种情况,并描述了它们的动态响应。
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