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单向纤维增强复合材料的力学性能是横观各向同性的,当前在承受强压缩载荷的场合应用日趋广泛,需建立适合工程应用的细观力学纵向压缩强度预测模型。单向纤维增强复合材料纵向压缩强度与组成复合材料的各相的力学性能、组分含量、缺陷分布等诸多因素有关,对其纵向压缩破坏机理仍未形成广泛而统一的认识,故现有的压缩强度模型虽然较多但彼此各不相同。各种模型对组分相同的单向纤维增强复合材料的压缩强度预测的结果相差较大。为此,对近年来单向纤维增强复合材料纵向压缩强度的主要细观预测模型进行了评述,对细观力学压缩强度预测模型的发展线索进行了整理,分析了其所基于的破坏机理和所考虑的影响破坏的因素,指出了不同模型的适用条件,提出了试验与理论分析相结合的方法进行模型选择。
The mechanical properties of unidirectional fiber-reinforced composites are transversely isotropic. At present, the applications of the unidirectional fiber-reinforced composites are becoming more and more widespread under the conditions of strong compressive loads. Therefore, the prediction model of longitudinal compressive strength of mesomechanics should be established for engineering applications. The longitudinal compressive strength of unidirectional fiber-reinforced composites is related to the mechanical properties, the content of constituents and the distribution of defects in each phase of the composites. There is still not a wide and unified understanding of the longitudinal compressive failure mechanism. Therefore, Although the compression strength model more but different from each other. The compressive strengths of the unidirectional fiber-reinforced composites with the same composition predicted by the models differed greatly. In this paper, the main models for predicting the longitudinal compressive strength of unidirectional fiber reinforced composites in recent years are reviewed, and the development clues of the microcosmic compressive strength prediction model are summarized. The failure mechanisms and Considering the factors that affect the damage, the applicable conditions of different models are pointed out, and the method of combining experimental and theoretical analysis is proposed to select the model.