树脂基碳纤维卷铺管件热残余应力分析

THERMAL RESIDUAL STRESS ANALYSIS OF POLYMER MATRIX CARBON FIBER REINFORCED COMPOSITE WINDING TUBES

对树脂基碳纤维卷铺管在高温固化后冷却至室温过程中进行了热应变实验,基于实体单元的分层属性建立了多种铺层复合材料管件的热残余应力数值模型,数值计算结果与实验结果吻合较好。在该数值模型基础上,从纤维方向应力的角度分析了铺层角度、环向层纤维含量、环向层铺设位置以及径厚比对卷铺管件热残余应力的影响。结果表明,上述诸因素均对残余应力有较大的影响,(±φ)_n铺层和90°/0°正交组合铺层中的0°纤维在纤维方向上残余应力均为轴向受压、环向受拉,该应力状态可能导致管件出现微裂缝等初始缺陷。

Thermal strain test of polymer matrix carbon fiber-reinforced composite winding tube curing on high temperature was carried out during the process of cooling to room temperature. The thermal residual stress numerical model of composite tube with various plies was established based on hierarchical attributes of the entity unit and the numerical results are in good agreement with the test results. On the basis of the numerical model, from the respect of the stress of fiber direction, the influence factor of thermal residual stress, such as the ply angle, contents of hoop fiber, position of hoop lays and the aspect ratio of the winding tube, are analyzed. The results show that the above influence factors have great influence on the residual stress. The residual stress in the fiber direction of the ply angle of （ ±φ）n and the 90% plies orthogonal combination 0° fibers are compressive, and the hoop direction are extensive, which could cause the pipe initial defect micro-cracks.