摘要
T型接头作为常见的复合材料结构连接型式,其力学性能直接关系到结构的安全性。建立了考虑胶层的复合材料T型接头有限元模型,将仿真结果与试验图像进行对比,其变形形式和破坏模式与试验吻合较好。研究表明,在垂向载荷作用下,T型接头呈现"S"型弯曲;在蒙皮折角处以及端部胶接处出现应力集中;胶层剪应力两端大,中间出现低应力槽型区,弯曲正应力、等效应力呈现出双峰值特征;T型接头最有可能出现的破坏形式为胶层与蒙皮之间剥离,而芯材则由于应力集中引起剪切破坏或拉伸破坏。在折角处倒圆、在胶接处光滑过渡可以明显消除应力集中。
As common connection form of composite structure,T-joints＇ mechanical properties is directly related to the safety of structure. This paper establishes finite element model of composite T-joints considering bond layers. Then the simulation results are compared with experimental images,whose deformation and failure modes fit the experiment well. Research indicates that： T-joint presents ＂S＂bending in the vertical loading; stress concentration appears in the corner of skin and at the end of weld; shear stress is high at both end,while the middle part appears low stress groove area; the bending normal stress and the equivalent stress appear double peak value feature; the most likely damage form is stripping between skin and bond layer,while the failure of core is shear failure and tensile failure due to stress concentration. Rounding in the corner of skin and smooth transition at the end of weld can obviously eliminate stress concentration.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2015年第4期41-46,共6页
Fiber Reinforced Plastics/Composites
关键词
T型接头
胶层
应力集中
T-joint
bond layer
stress concentration
