纤维体积含量和富树脂对复合材料V型结构 固化变形的影响

In order to study the effect of mold factors on fiber volume content, resin-rich and curing distortions of composite, a series of V-shaped T700/QY9611 composite parts were cured through autoclave process and the fiber volume, resin-rich area and spring-in were measured and studied. A three-dimensional finite element analysis (FEA) model considering the effect of thermal load, resin cure shrinkage, mold contact, fiber volume content and resin-rich was built to simulate the spring-in of V-shaped parts, and the effect of fiber content gradient and resin-rich on spring-in was quantitatively analyzed. The results show that there will be 10% of fiber volume content gradient and 2.2 mm thick resin-rich area in V-shaped parts fabricated on female mold and the value reduce to 6.8% and 1.2 mm for larger corner radius mold, meanwhile, mold materials have little effect on fiber volume content and resin-rich area. The spring-in of test specimens fabricated on female mold increase by 21.0% than male mold, and decrease by 9.6% with larger corner radius female mold. The female mold mainly affects spring-in through fiber volume content and resin-rich area. The simulation results show that spring-in are proportional to fiber volume content gradient and thickness of resin-rich area. 10% of fiber volume content gradient will lead to 13.5% of spring-in difference and 3.0 mm thick resin-rich area will result in 45.8% of spring-in difference. The comparison between simulation results and experiment verifies the model.