Theoretical prediction for modulus and yield strength of syntactic foams
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摘要: 基于广义自洽原理，利用四相球模型研究了复合泡沫塑料在拉伸加载下的力学性能，并对其可能发生的破坏进行了分析，发现模型退化后给出的泡沫材料强度预测结果与实验值符合较好。通过分析微珠与基体界面的法向应力集中系数和基体相的von Mises应力分布，可以发现，当微珠壁极薄时，微珠的力学行为与实心柔性粒子相似，随着微珠壁厚的增加，微珠对材料整体力学行为的影响与实心刚性粒子的影响接近相同。通过引入破坏影响因子，对复合泡沫塑料的强度预测进行研究，提出了一种有效的预测方法。Abstract: Based on the generalized self-consistent principle, the mechanical properties of syntactic foams under tensile loading were investigated by a four phase sphere model, and the possible damages happening in syntactic foams were analyzed. After degradation of the model, computational results show that the predicted strength values of foams agree with experimental results well. By analyzing the normal stress concentration coefficient of interface between microspheres and matrix and von Mises stress distribution of matrix, it is found that the mechanical behavior of microspheres is similar with flexible solid particles's as the wall of microspheres is very thin. With the increase in wall thickness of microspheres, the influence of microspheres on whole mechanical behavior of material accords with rigid solid particle's. Finally, through introducing the damage effect factors, prediction for the strength of the syntactic foams were studied and an effective method for prediction of strength was provided.
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Keywords:
- glass microsphere /
- syntactic foams /
- mechanical properties /
- modulus /
- yield strength /
- failure analysis
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