纤维增强复合材料层合板分层破坏的研究

本文对纤维增强复合材料层合板的分层破坏进行了大量的试验,同时用三维有限元进行应力分析。试验和分析结果表明此类层合板的分层总是发生在θ/90界面上,该界面上不仅层间剪应力大而且层间正应力也大。通过对不同θ/90界面的临界能量释放率的测定表明,对层合板不同的θ/90分层界面的G_ⅠC和G_ⅡC是随θ角的变化而变化。文中对一个Ⅰ型,Ⅱ型耦合型能量释放率分层判据的应用作了改进,试验结果表明此改进是有效的。

AN INVESTIGATION ON THE DELAMINATION DAMAGE OF FIBER-REINFORCED COMPOSITE LAMINATED PIATES

In this paper the investigations on the delamination damage of fiber-reinforced composite laminated plates have been done by both experiments and three dimensional finite element analysis.The obtained results show that the delamination of these laminates always occurs on A/90 interfaces where both interlaminar shear stresses and interlaminar normal stress are much bigger. It can also be seen that the critical strain energy release rates GⅠC and GⅡC vary with the stacking angle θ for different A/90 interfaces of laminates.A delamination criterion of mixed mode strain energy release rate has been improved for its applications.The experimental results obtained show that this improvment is effective.