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简介热固性聚合物广泛地用作纤维增强复合材料的基体。这些基体一般都较脆,所以对其断裂性能引起极大的关注。用线弹断裂机理(LEFM)研究热固性聚合物中裂缝扩展方面的最新进展已有评述。文中表明,近来在了解控制裂缝扩展的判断方面取得了很大进展。对连续性扩展和粘滑性扩展来说,断裂的判断都是:在裂缝的临界距离前方材料所受的临界应力必须达到屈服应力的3至4倍。本文也讨论了产生裂纹的可能性,以及微观结构对裂缝扩展的影响,
Introduction Thermosetting polymers are widely used as a matrix for fiber-reinforced composites. These substrates are generally brittle and therefore cause great concern for their fracture properties. Recent advances in the study of crack propagation in thermosetting polymers by the linear elastic fracture mechanism (LEFM) have been reviewed. The article shows that much progress has recently been made in understanding the judgment of controlling crack propagation. For continuation expansion and stick-slip expansion, the fracture is judged as follows: The critical stress on the material in front of the critical distance of the crack must reach 3 to 4 times the yield stress. This paper also discusses the possibility of crack initiation and the effect of microstructure on crack propagation.