工艺与制造英文2025
焊接表面粗糙度对热塑性复合材料焊接接头性能的影响机制
Mechanism of Welding Surface Roughness on Weld Joint Performance in Thermoplastic Composite Structures
Qian Wang, Yinwu Yan, Caixia Jia, Yunpeng Qiu, Zhixin Li, Bowen Feng · College of Aerospace Engineering, Shenyang Aerospace University Shenyang China
摘要整理
本研究探究了玻纤增强PA6（GF/PA6）热塑性复合材料的超声波焊接（USW）工艺，首次揭示了无能量导向器（ED）条件下表面粗糙度的影响规律。建立了耦合热-力学有限元（FE）模型，通过分析焊接参数对界面温度场和熔融区演变过程的影响，深入研究了焊接表面粗糙度对接头性能的关键作用。研究结果表明，采用优化焊接工艺参数——焊接振幅为额定值的70%、焊接时间为0.8 s——GF/PA6的搭接剪切强度（LSS）达到27.6 MPa的较高水平。在此基础上，通过简单砂磨将焊接表面粗糙度从16.3 μm降低至9 μm以下，促进了熔融树脂和纤维的扩散和结合，进一步将LSS提升至29.9 MPa。研究表明表面粗糙度的降低能够显著改善接头性能，为热塑性复合材料超声波焊接工艺优化提供了重要指导。
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