真空渗漏工艺缺陷对VARI成型复合材料质量及性能的影响

Effect of vacuum leakage process deficiency on quality and performance of VARI molded composite

分析了真空辅助树脂渗透(VARI)工艺系统真空对成型质量的重要性。通过在VARI工艺的进胶截门前、出胶截门后及进出胶截门之间3个区域分别设置渗漏点,调整渗漏点的大小控制真空渗漏的严重程度,对研制的不同渗漏位置以及不同渗漏严重程度的试验件进行外观评价、厚度测试以及超声缺陷检测。并通过测试不同试验件的开孔压缩性能开展了工艺试验,得到了VARI工艺过程中真空渗漏的位置和程度对复合材料质量的影响:当系统真空出现轻微渗漏时,对VARI工艺成型复合材料制件的最终质量的影响需根据渗漏点进行判定;当系统真空出现严重渗漏时,对VARI工艺成型复合材料制件的最终质量有严重影响,与渗漏的部位无关;VARI工艺成型复合材料层合板的开孔压缩强度与制件的孔隙率成反比关系。

The importance of the vacuum pressure in the VARI process system to the quality of molding was analyzed.In this paper,experiments were designed and conducted to investigate the effect of position and degree of vacuum leakage to the quality of the composite.Leakage sites were pre-installed before the inlet valve,after the outlet valve,and between the inlet valve and the outlet valve of the VARI process separately,and the leakage severity was controlled by the size of the leakage site.The test articles produced with different leakage sites and different leakage severities were examined on appearance evaluation,thickness test and ultrasonic defect detection.And the open hole compression performance of different test articles were tested.Provided that slight vacuum leakage is present in the system,the corresponding effect on the final quality of the composite article prepared by VARI process should be judged according to the leakage sites.Provided that serious vacuum leakage is present in the system,the final quality of the composite article prepared by VARI process will be seriously affect regardless of the leakage sites.The open hole compression(OHC)strength of VARI molded composite laminate plate and the porosity of the article have an inverse relationship.