Micromechanical modelling of syntactic foam
Micromechanical modelling of syntactic foam
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DOI：
10.1016/j.compositesb.2019.107701
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发表时间：
2020-02-15
影响因子：
13.1
通讯作者：
Fergusson, A. D.
中科院分区：
文献类型：
--
作者：
Carolan, D.;Mayall, A.;Fergusson, A. D.
提出了一种数值-实验相结合的方法，该方法不仅能够准确地预测复合泡沫的弹性模数和拉伸破坏强度，而且可以解释这些测量中的实验观察到的散射。一般来说，对于所研究的体系，微球含量的增加会导致拉伸模量的增加和拉伸强度的下降。在低颗粒载荷率下，测量的实验强度的变化几乎完全可以归因于微球之间的颗粒间距离的分布，而在高颗粒载荷量下，微观结构中的几何变化被证明只是强度数据中观察到的散射的部分原因。因此，第一次得出了下面的微观结构和实验观察到的断裂强度散布之间的直接联系，并用模型进行了证实。
A combined numerical-experimental method that enables accurate prediction of not only the elastic moduli and tensile failure strengths of syntactic foams, but also accounts for the experimentally observed scatter in these measurements is presented. In general, for the systems studied, an increase in microsphere content resulted in an increase in tensile modulus and a decrease in tensile strength. At low particle loading ratios, the variance in the measured experimental strength can be almost entirely attributed to the distribution of inter-particle distances between the microspheres, whilst at high particle loadings, geometric variance in the microstructure is shown to be only partially responsible for the observed scatter in strength data. Thus, for the first time, a direct link between the underlying microstructure and the experimentally observed scatter in fracture strength is drawn and substantiated with modelling.