低温条件下含孔碳纤维复合材料层合板拉伸损伤特性研究

Study of tensile damage characteristics of carbon fiber composite laminates containing holes under low temperature conditions

基于碳纤维复合材料损伤机理研究,建立数值仿真模型,并预测损伤初始发生及极限载荷。在室温(23±3)℃干态与低温(-60±3)℃干态两种环境下,对三种不同开孔形状及孔径的碳纤维复合材料(CFRP)层合板进行拉伸破坏实验,分析其拉伸性能和损伤机理。实验验证在两种环境下,具有圆形孔的层合板拉伸强度最大;低温环境下含孔层合板的抗拉强度要强于室温环境下;对层合板不同位置的应变进行测量得知,在拉伸试验中,最大应变发生在与载荷平行的孔切线的切点附近,最小应变发生在与载荷垂直的孔切线的切点附近。

Based on the damage mechanism study of carbon fiber composites, this article established a numerical simulation model and predicted the initial occurrence of damage and ultimate loads. Under dry state at room temperature(23±3) ℃ and dry state at low temperature(-60±3) ℃, tensile damage experiments were conducted on three carbon fiber composite(CFRP) laminates with different hole shapes and diameters, and their tensile properties and damage mechanisms were analyzed. The result shows that the tensile strength of the laminate with circular holes is the highest in both environments, the tensile strength of the laminate with holes in low temperature environment is stronger than that in room temperature environment. Measurements of strains at different locations in the laminate showed that the maximum strain in the tensile test occurred near the tangent point of the hole tangent line parallel to the load, and the minimum strain occurred near the tangent point of the hole tangent line perpendicular to the load.