钢-玻璃单端面胶接接头剪切受力的几何参数分析

Geometric parameters analysis of shear stress of steel-glass single end adhesive joints

采用单端面拉伸剪切试件进行试验,模拟了钢-玻璃组合I形梁胶接接头的受力特性,观察了结构胶的破坏模式和局部破坏现场,测定了硅酮结构胶剪切力学性能随着胶接长度、厚度和宽度的变化规律。研究结果表明:当胶接长度为30 mm时,易受剥离作用的影响,当胶接长度大于30 mm时,剥离作用可忽略不计;随胶接长度的增加,接头的极限承载力线性增加,承载力提高的梯度约8.75 N/mm,而极限位移变化不大;随着胶接厚度的增加,接头的极限承载力以约41 N/mm的梯度线性降低,而极限位移以约2.6 mm/mm梯度线性增加;随胶接宽度的增加,接头的极限承载力显著提高。

The mechanical behavior of bonded joint of steel glass composite I beam is simulated by tensile shear test bonded at the end face.The failure modes and local failure phenomena of structural adhesives are observed.The shear mechanical properties of silicone structural adhesive are studied with the change of bonding length,bonding thickness and bonding width.The results of the study show that：when the bonding length is 30 mm,the joint is easy to be affected by the peel effect,and when the bonding length is greater than 30 mm,the peeling effect can be neglected.With the increase of bonding length,the ultimate bearing capacity of the joint is increased linearly with the gradient of about 8.75 N/mm,while the ultimate displacement does not change significantly.With the increase of bonding thickness,the ultimate bearing capacity of the joint is decreased linearly with the gradient of about 41 N/mm,while the ultimate displacement is increased linearly with the gradient of about 2.6 mm/mm.With the increase of bonding width,the ultimate bearing capacity of the joint is increased significantly.