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通过光纤光栅的方法实验研究了在热压罐成型工艺过程中,复合材料构件由金属固化模具与复合材料构件热不匹配导致的沿厚度方向和面内的固化残余应力发展,得到了固化后残余应力沿构件厚度方向和面内的分布情况,并分析了该残余应力分布的产生机制以及对构件固化后变形的影响。结果表明:复合材料与模具之间的热不匹配导致的固化残余应变沿构件厚度方向呈梯度分布,靠近模具端大于远离模具端,并且该应变会引起构件固化后的翘曲变形,变形以沿纤维方向为主。
Through the experiment of fiber grating, the curing residual stress in the thickness direction and in-plane direction caused by the thermal mismatch between the metal-cured mold and the composite material during the autoclave molding process was studied. The residual after curing The distribution of stress along the thickness and in-plane of the member, and the mechanism of the residual stress distribution and the effect on the deformation of the member after curing were analyzed. The results show that the thermal residual strain caused by the thermal mismatch between the composite material and the mold is distributed along the thickness direction of the component and is closer to the mold end than away from the mold end, and the strain will cause the component to warp after curing, Fiber-based.