摘要
碳纤维编织层合板具有高比强度和易成形性,在工业领域内作为结构件的应用越发广泛。基于Hashin强度判据分析T300/E51碳纤维编织层合板在球形压头准静载条件下的力学响应,研究变形时的组分材料损伤,以组分材料刚度的退化表示其失效。试件损伤表现为压头背向处纤维应力较大,发生断裂,并垂直于该处纤维方向扩展,各层纤维应力差较大,试验结果与计算结果一致性较好;以此为依据设计了表层材料为T700SC的双层板,有效的改善了内外层应力差别较大的问题。
Carbon fiber braided laminates as structural part is widely used in industrial production due to its features of high specific strength and formability. Based on Hashin strength criterion,the mechanical responses of T300/E51 carbon fiber braided laminates is analyzed under quasi-static loading condition of spherical indenter. It studies the deformation damage of component materials,and using stiffness degradation to denote its failure. Specimen damage is manifested as fibers stress increase even to break on the back of indenter,and the fissure propagate perpendicular to the fiber direction,the stress difference in different layers is large. Results of computational model are in good agreement with experiments. Further,a double-layer laminate was designed T700 SC fabric as the surface layer,which solves the problem of large stress difference between the inner and surface layer.
引文
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