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聚酰亚胺基复合材料由于其自身反应复杂,成型难度较大,带拐角的聚酰亚胺基复合材料构件,其拐角区域(以下称为R区或R角)更容易产生分层、架桥等缺陷,本研究从拐角处的应力及固化过程中的模具、零件热膨胀差异等方面着手,探讨了拐角处的分层缺陷的成因及机理,并通过试验进行验证。发现,铺层结构、模具形式、热匹配等因素对拐角处分层缺陷影响较大。
Polyimide matrix composites are more difficult to form because of their complex reactions. Polyimide matrix composites with corners are more likely to delaminate in the corner areas (hereinafter referred to as R zone or R corner) Bridge and other defects, this study from the corner of the stress and the curing process of the mold, parts thermal expansion differences and so on, discussed the corner of the delamination defects in the cause and mechanism, and verified by the test. Found that the layer structure, mold form, thermal matching and other factors on the corner of the stratification defects.