三明治结构中T形焊接接头力学性能测试分析

Mechanical property testing and analysis of T-joints in sandwich panels

摘要: 提出双剪切试验模型和T形接头的弯矩试验模型,用于测定焊缝及接头在不同工作应力状态下的不均匀变形和失效过程,并利用有限元计算对接头中焊缝变形及应力状态进行分析.结果表明,金属三明治板在承受弯矩载荷时面板和芯板连接处的焊接接头主要承受平行于面板的剪应力和弯矩作用;随着加载,损伤起始于焊缝焊根处,并向纵深扩展.针对接头失效分析,试验与数值计算得到了较统一的结果.

Abstract: The deformation and failure of welded joints in the typical sandwhich panels have been studied by means of the shearing test and the T-joint bending test,combining with FEM simulation. The results show that during bending process,the welded joints between front panel and web panel are mainly subjected to shearing and bending moment parallel to the front panel. With load increasing,there is damage initiation at the weld root,along with a deep expanding cracking path. Aimed at the failure analysis of welded joints,experiments have a good agreement with numerical results.