Influence of fiber volume content and resin-rich area on process distortions of V-shaped composite parts
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摘要: 为研究模具因素对复合材料纤维体积含量、富树脂以及固化变形的影响，利用热压罐工艺完成了T700/QY9611复合材料V型结构成型试验，对其纤维体积含量、富树脂厚度以及回弹变形进行测量与研究。建立了考虑热载荷、树脂收缩载荷、模具接触、纤维体积含量以及富树脂等因素的复合材料回弹变形预测三维有限元分析模型，定量分析了纤维体积含量梯度和富树脂对回弹变形的影响。研究结果表明：使用阴模模具产生10.0%的纤维体积含量梯度和2.2 mm的富树脂，拐角半径增大后分别减小为6.8%和1.2 mm，模具材料的影响较小；使用阴模成型试验件变形增大21.0%，使用拐角半径较大的阴模，变形减小了9.6%，阴模模具主要通过纤维体积含量和富树脂影响回弹变形；模拟结果表明：V型构件的变形与纤维体积含量梯度和富树脂厚度呈正比例，10%的纤维体积含量梯度导致13.5%的变形差异，3.0 mm厚的富树脂会产生45.8%的变形差异。模拟结果与实验结果对比验证了模型的准确性。Abstract: 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.
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Keywords:
- composite /
- autoclave process /
- spring-in /
- fiber volume content /
- resin-rich /
- FEA
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