Effect of hygrothermal environment on properties of induction welding joint of carbon fiber reinforced polyphenylene sulfide laminate
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摘要: 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。Abstract: 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.
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图 1 设备及碳纤维增强聚苯硫醚(CF/PPS)层合板单搭接焊接示意图
Figure 1. Equipment and schematic diagram of single lap welding of carbon fiber reinforced polyphenylene sulfide (CF/PPS) laminates
图 2 CF/PPS层合板母材及焊接接头的吸湿曲线
Figure 2. Moisture absorption curves of CF/PPS laminates and welded joints
图 3 PPS树脂湿热处理前后红外光谱
Figure 3. Infrared spectra of PPS resin before and after hygrothermal treatment
图 4 不同测试温度和吸湿条件下CF/PPS层合板焊接接头的剪切强度
Figure 4. Shear strength of CF/PPS laminate welded joints under different test temperatures and moisture absorption conditions
图 5 不同测试温度下PPS板材的载荷-位移曲线
Figure 5. Load-displacement curves of PPS sheet at different test temperatures
图 6 室温下不同吸湿条件CF/PPS层合板焊接接头剪切断口形貌
Figure 6. Shear fracture morphologies of CF/PPS laminate welded joints under different moisture absorption conditions at room temperature
图 7 高温下不同吸湿条件CF/PPS层合板焊接接头剪切断口形貌
Figure 7. Shear fracture morphologies of CF/PPS laminate welded joints under different moisture absorption conditions at high temperature
表 1 CF/PPS层合板母材及焊接接头的吸湿参数
Table 1. Moisture absorption parameters of intact specimens and welded joints of CF/PPS laminates
Sample Time for hygroscopic equilibrium/h Saturated moisture absorption/% Hygroscopic rate/h−1 CF/PPS laminate 240 0.3812 0.0249 CF/PPS welding sample 312 0.4801 0.0264 
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