含离散源损伤Z向增强复合材料加筋板压缩特性研究

以含穿透中央筋条的切口模拟离散源损伤,对无增强、Z-pin增强、改进锁式缝合增强、Tufting缝合增强复合材料加筋板进行轴向压缩试验,研究含离散源损伤Z向增强加筋板的损伤扩展模式与破坏特征。结果表明,壁板和筋条间的Z向增强有效控制了壁板与筋条的脱粘,提高了加筋板的屈曲载荷。切口前端的分层只引起局部的屈曲,沿切口方向未切断筋条的断裂和壁板边缘的突然压溃导致加筋板的最终破坏。三维有限元渐进损伤分析结果显示,选用Hashin判据作为失效判据,可以很好地模拟含离散源损伤复合材料加筋板的轴向压缩渐进损伤过程。采用线约束模拟壁板与筋条翼缘之间的Z向增强是合理的,线约束的引入在损伤扩展至筋条下方壁板区域后有效控制了损伤的扩展。

STUDY ON COMPRESSIVE PROPERTIES OF Z-REINFORCED STIFFENED COMPOSITE PLATE WITH DISCRETE-SOURCE DAMAGE

Simulated the discrete-damage with a notch in stiffened composite plate.The mechanical responses of stiffened composite plates with a notch reinforced by Z-pin,improved locking type stitch,Tufting type stitch and unreinforced under compress were investigated.Stiffened panel of Z-reinforced with discrete-source damage had been studied on damage propagation and failure property.The results indicated that Z-reinforced could restrain debonding between web plate and ribs.Partial delamination at the tip of the notch only caused local buckling,cracking along notch direction between unbroken web plate and edge of rib resulted in ultimate failure of stiffened plate.Three-dimensional FEA(finite element analysis) simulation of stiffened composite panel with discrete-source damage showed that Hashin criteria could be used to simulate progressive damage effectively.Simulated Z-reinforced with linear constraints between web plate and ribs were reasonable,those constraints controlled damage extension and changed damage region of the whole model.