湿热环境对碳纤维增强聚苯硫醚层合板感应焊接接头性能的影响

以碳纤维增强聚苯硫醚(Carbon fiber reinforced polyphenylene sulfide, CF/PPS)复合材料层合板为研究对象，采用感应焊接方法对CF/PPS层板进行了焊接，重点研究了湿热环境对CF/PPS层板焊接接头性能的影响，实验结果表明:吸湿前后PPS树脂未发生化学变化；室温环境下，随着吸湿时间的增加，焊接接头剪切强度逐渐下降，与干态焊接接头相比分别降低了15%、18%、23%、32%和38%，不锈钢网-树脂基体-碳纤维界面处的湿应力不断增大，削弱了焊接接头界面的结合性能，影响了焊接接头的失效形式；120℃环境下，不同吸湿时间焊接接头剪切强度的下降率分别为12%、15%、22%、37%和44%，高温高湿使不锈钢网-树脂基体-碳纤维界面处热应力和湿应力增大，加剧了界面结合的损伤，界面脱粘成为焊接接头主要的失效形式。 

Effect of hygrothermal environment on properties of induction welding joint of carbon fiber reinforced polyphenylene sulfide laminate

The carbon fiber reinforced polyphenylene sulfide (CF/PPS) composite laminate was taken as the research object, and the induction welding method was used to weld the CF/PPS laminate. It was focused on the effect of hygrothermal on the welded joint performance of the CF/PPS laminate. The experimental results show that the PPS resin does not undergo chemical changes before and after moisture absorption. At room temperature, the shear strengths of the welded joints gradually decrease with the increase of moisture absorption time, and compared with the dry welded joints, they are reduced by 15%, 18%, 23%, 32%, and 38%, respectively. The wet stress increases at the interface of the stainless steel mesh, resin matrix and carbon fiber, which weakens the bonding performance of the welded joint interface, and affects the failure mode of the welded joint. Under the environment of 120℃, the shear strength values of the welded joints with different moisture absorption times decrease by 12%, 15%, 22%, 37% and 44%, respectively. High temperature and high humidity make the thermal stress and wet stress at the interface of the stainless steel mesh, resin matrix and carbon fiber greater, which aggravates the damage of interface bonding performance. Interface debonding is the main failure form of the welded joints.