胶接修理方式对复合材料层合板拉伸性能的影响

Effects of Bonding Repair Methods on Tensile Properties of Composite Panels

针对含圆形穿透损伤的复合材料层合板,分别采用双面贴补和挖补两种方式进行修理,对修补结构进行了拉伸性能测试,同时进行了完好板与含圆形穿透损伤未修理试验件的对比拉伸性能试验。试验结果表明:含圆形穿透损伤未修理试验件的拉伸强度仅为完好试验件拉伸强度的49.27%;采用贴补和挖补两种方式进行修理的结构拉伸强度恢复率能达到100%左右;试验件的破坏模式均为横向断裂,完好试验件的破坏出现在靠近加强片的位置,含圆形穿透损伤未修理试验件的破坏出现在圆形穿透孔所在横截面;50%的贴补修理试验件的破坏位置出现在非修理区,对应的拉伸强度较高,达358.15 MPa,另外有50%的试验件出现在修理区,对应的强度值偏低,仅为293.3 MPa;挖补修理试验件的破坏位置均出现在非修理区,且拉伸强度均较高,达347.1 MPa。试验结果表明,挖补修理复合材料层合板的拉伸强度较贴补修理高6.5%,性能优于贴补修理。

Two different methods,double-lap repair and scarf repair were used to repair the composite panels with circular penetrated damage and tensile tests were carried out to compare their performances.As a comparison,the tensile tests of unnotched laminate and damaged laminate were also carried out and their tensile strengths were used to compute the repair efficiency.Test re-sults show that the damaged and unrepaired laminate’s tensile strength is only about 49.27%of that of the pristine laminate.Howev-er,after repaired,the ensile strength recovery rates of the double-lap-repaired and scarf repaired structure can reach about 100%.The failure modes are main transverse net-tension failure.For unnotched laminate,the failure occurs near the tabs.While for damaged laminate,the failure is found to be along the cross section of the hole.For about 50%of double-lap specimens,the failure occurs in the undamaged region and the tensile strength is also higher,which are up to 358.15 MPa.While for the other 50%of double-lap specimens,the failure occurs in the repair region and the corresponding strength is lower which is only 293.3 MPa.For all scarf re-pair specimens,the ultimate failure is found to be in the undamaged area,and the recovery tensile strength is 347.1 MPa.The tensile strength of scarf repair is 6.5%higher than that of the double-lap repair.The performance of scarf repair is superior to the double lap repair.