复合材料孔边分层灌胶修理强度恢复能力研究

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

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。

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 2 DHashin failure criterion,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 repairing with glue,the Cohensive element was re-established in the layered area to analyze the strength recovery ability of carbon fiber composites.In conclusion,Hole-edge delamination of composites 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 delamination 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.