复合材料孔边分层灌胶修理强度恢复能力研究

分层缺陷是复合材料常见的缺陷之一,对灌胶修理复合材料强度恢复进行研究。基于2DHashin失效准则,以线性准则描述其损伤演化过程,利用ABAQUS/Standard模块进行非线性分析,研究碳纤维复合材料的孔边分层缺陷,采用灌胶修理后,对分层区域重新建立Cohensive单元,分析碳纤维复合材料强度恢复能力。结果表明:复合材料孔边分层对拉伸强度、压缩伸强度几乎无影响;随着钉载比的增大,拉伸极限载荷会有一定程度的降低;随着钉载比的增大,压缩极限载荷会有一定程度的降低;灌胶修理后,孔边分层的屈服载荷可恢复到无损状态;随着钉载比的增大,屈服极限载荷会有一定程度的增大。

Research on Glue-pouring Repair Strength Recovery Ability ofComposite Material Hole Edge Layered

Delamination defect is one of the common defects of composite materials. The recovery of the stregth of the composite material repaired by glue is studied. Based on the 2DHashin failure crite-rion , the damage evolution process is described by a linear criterion, use ABAQUS/Standard module for nonlinear analysis,study the hole edge delamination defect of carbon fiber composites. After re-pairing with glue, the Cohensive element was re-established in the layered area to analyze thestrength recovery ability of carbon fiber composites. In conclusion,Hole-edge delamination of com-posites has little effect on tensile strength and compressive tensile strength.With the increase of the nail load ratio, the ultimate tensile load will decrease to a certain extent. With the increase of the nail load ratio,the ultimate compression load will decrease to a certain extent. The yield load of the de-lamination at the edge of the hole can be restored to a non-destructive state after the repair with glue.With the increase of the nail load ratio, the yield limit load will increase to a certain extent.