On a possible methodology for identifying the initiation of damage of a class of polymeric materials

On a possible methodology for identifying the initiation of damage of a class of polymeric materials
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关于识别一类聚合物材料损坏起始的可能方法

DOI:
10.1098/rspa.2016.0231
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发表时间:
2016
期刊:
Physical and Engineering Sciences
影响因子:
--
通讯作者:
Rajagopal, K. R.
Rajagopal, K. R.
中科院分区:
--
文献类型:
--
作者:
Alagappan, P.;Kannan, K.;Rajagopal, K. R.

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在本文中,我们提供了一个可能的方法来识别一类聚合物固体的损伤开始。与大多数引入损伤参数的损伤方法不同,损伤参数可以是标量、矢量或张量,取决于应力或应变。(这需要了解适当的参考配置,其中主体没有应力和/或没有任何应变),我们利用这样一个事实的知识,即损伤总是身体的不均匀性的结果,这使得身体局部“虚弱”,一个物体的材料特性总是取决于物体的密度,以及在当前结构中可以定义的其他变量。这使我们能够使用密度,为一类聚合物材料,作为一种手段,以确定在体内的初期损伤。对非均匀多网络聚合物固体的双轴拉伸进行的计算证实了该理论的正确性,即物体的密度可以用来预测损伤的发生,理论预测与实验结果吻合得很好。该研究还提出了一个有意义的损伤标准,正在考虑的机构的类。
In this paper, we provide a possible methodology for identifying the initiation of damage in a class of polymeric solids. Unlike most approaches to damage that introduce a damage parameter, which might be a scalar, vector or tensor, that depends on the stress or strain (that requires knowledge of an appropriate reference configuration in which the body was stress free and/or without any strain), we exploit knowledge of the fact that damage is invariably a consequence of the inhomogeneity of the body that makes the body locally ‘weak’ and the fact that the material properties of a body invariably depend on the density, among other variables that can be defined in the current configuration, of the body. This allows us to use density, for a class of polymeric materials, as a means to identify incipient damage in the body. The calculations that are carried out for the biaxial stretch of an inhomogeneous multi-network polymeric solid bears out the appropriateness of the thesis that the density of the body can be used to forecast the occurrence of damage, with the predictions of the theory agreeing well with experimental results. The study also suggests a meaningful damage criterion for the class of bodies being considered.
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