Combined effects of silica filler and its interface in epoxy resin
Combined effects of silica filler and its interface in epoxy resin
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DOI：
10.1016/s1359-6454(02)00275-6
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发表时间：
2002-10
期刊：
影响因子：
9.4
通讯作者：
Haiying Wang;Yi-long Bai;Sheng Liu;Jiali Wu;C. Wong
中科院分区：
文献类型：
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作者：
Haiying Wang;Yi-long Bai;Sheng Liu;Jiali Wu;C. Wong
本文对白炭黑填充环氧树脂的力学性能进行了测试。测试表明，在高温下，材料的性能（例如屈服应力、流动应力等）随填料体积分数单调变化。纳米压痕测试结果表明，界面区域，比基体更强，形成在材料中。界面的形成对材料的屈服强度有积极的影响。在基体中添加颗粒会对应力分布产生较大的扰动，导致基体中的应力集中。应力集中对材料的屈服强度有负面影响。计算表明，试样中的最大应力随颗粒浓度的变化呈非单调变化。因此，材料力学行为的非单调变化可能根源于界面区的矛盾效应和颗粒添加引起的应力集中。
In this paper, mechanical properties of silica-filled epoxy resin are tested. The tests show that at elevated temperatures, the material’s properties (e.g. yield stress, flow stress, etc.) vary immonotonically with filler volume fraction. Nano-indentation test results suggest that an interface region, stronger than the matrix, is formed in the materials. The formation of the interface has positive effects on the yield strengths of materials. The addition of particles in the matrix produces a large disturbance in stress distribution, leading to stress concentration in the matrix. The stress concentration has negative effects on the yield strengths of materials. The calculation demonstrates that the maximum stress in samples varies immonotonically with particulate concentration. So, the immonotonic variation of mechanical behavior of materials may be rooted in the contradictory effects of the interface region and the stress concentration caused by particulate addition.