Zhao Quanyue, Wu Hantai, Chen Xinyu, Chen Xiaoxuan, Xu Shuaiheng, He Chunwang, Zhao Tian
Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
Polymers (Basel). 2023 Aug 26;15(17):3555. doi: 10.3390/polym15173555.
Ultrasonic welding technology represents an advanced method for joining thermoplastic composites. However, there exists a scarcity of systematic investigations into welding parameters and their influence on the morphological characteristics and quality of the welded regions. Furthermore, a comprehensive experimental understanding of the welded joint failure mechanisms remains deficient. A robust model for simulating the failure behavior of welded joints under loading has yet to be formulated. In this study, ultrasonic welded specimens were fabricated using distinct welding control methods and varied parameter combinations. Diverse experimental methodologies are employed to assess the morphological features of the welded areas, ascertain specimen strength, and observe welding interface failure modes. Based on a cohesive model, a finite element model is developed to predict the strength of the ultrasonic welded joints and elucidate the failure mechanisms. The results showed that, under identical welding parameters, the specimens welded with a high amplitude and low welding force exhibit superior welding quality. The specimens produced under displacement control exhibit minimal dispersion in strength. The proposed finite element model effectively prognosticates both welded joint strength and failure modes.
超声波焊接技术是一种用于连接热塑性复合材料的先进方法。然而，目前对于焊接参数及其对焊接区域形态特征和质量的影响缺乏系统的研究。此外，对焊接接头失效机制的全面实验理解仍然不足。尚未建立一个用于模拟加载条件下焊接接头失效行为的可靠模型。在本研究中，使用不同的焊接控制方法和多种参数组合制备了超声波焊接试样。采用多种实验方法来评估焊接区域的形态特征、确定试样强度并观察焊接界面失效模式。基于内聚模型，开发了一个有限元模型来预测超声波焊接接头的强度并阐明失效机制。结果表明，在相同的焊接参数下，采用高振幅和低焊接力焊接的试样具有更好的焊接质量。在位移控制下生产的试样强度分散最小。所提出的有限元模型有效地预测了焊接接头的强度和失效模式。
