This study evaluates the effects of freeze/thaw cycles on the mechanical performance and failure mode of resistance-welded carbon fibre/polyphenylene sulphide composite joints. Dry and moisture-saturated joints are subjected to 1000 temperature cycles varying between –40°C and 82°C. A silane coating is applied on the stainless steel mesh heating element to improve its adhesion with the polyphenylene sulphide polymer. Results show the limited impact that freeze/thaw cycles have on the lap shear strength of joints welded without any coating on the heating element. The silane coating improves the lap shear strength by 32% when no freeze/thaw cycles are applied to the joints. This improvement of 32% reduces when joints are subjected to freeze/thaw cycles but the mechanical performance remains superior to that of joints welded using uncoated heating element. Fracture surfaces show that fibre/matrix and stainless steel/matrix interfaces are both affected by the environmental conditions although it does not translate into lower lap shear strength.

中文翻译：

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冻融循环对电阻焊碳纤维/聚苯硫醚复合材料接头力学性能的影响

本研究评估了冻融循环对电阻焊接碳纤维/聚苯硫醚复合材料接头的机械性能和失效模式的影响。干燥和饱和湿气的接头经受 1000 次在 –40°C 和 82°C 之间变化的温度循环。将硅烷涂层涂在不锈钢网状加热元件上，以提高其与聚苯硫醚聚合物的附着力。结果表明，冻融循环对加热元件上没有任何涂层的焊接接头的搭接剪切强度的影响有限。当没有冷冻/解冻循环应用于接头时，硅烷涂层将搭接剪切强度提高了 32%。当接头经受冻融循环时，这种 32% 的改进会降低，但机械性能仍然优于使用未涂层加热元件焊接的接头。断裂表面表明，纤维/基体和不锈钢/基体界面都受环境条件的影响，尽管它不会转化为较低的搭接剪切强度。