胶粘剂力学性能参数对劈裂载荷作用下胶接接头中应力分布的影响

运用三维有限元法分析了胶粘剂力学性能参数对劈裂载荷作用下胶接接头(简称劈裂接头)应力分布规律的影响.结果表明:胶粘剂弹性模量和泊松比的变化对劈裂接头应力分布有着直接影响;随着弹性模量或泊松比升高,胶层内应力分布重心向左端移动,左端应力集中加强,峰值应力上升,但是泊松比对胶层最大主应力峰值的影响不如弹性模量的影响明显.

Effect of Mechanical Parameters of Adhesive on Stress Distribution of Adhesive Bonded Joints under Cleavage Loading

The stress distribution of adhesively-bonded metal/metal single lap joints under cleavage loading is analyzed using three-dimensional finite element method(FEM).The influence of mechanical parameters of adhesive on the stress distribution of cleavage joints is discussed in detail.It is shown that adhesive has great influence on the stress distribution of the lap region.Increasing elastic modulus or Poisson's ratio of adhesive also can cause the stress concentration at the left end of the adhesive layer.With the increment of elastic modulus or Poisson's ratio of adhesive,peak values of stresses distribution increase and stresses concentration at left end of adhesive layer become obviously higher.However,observations having been made in particular on normal and shear stress components at the interfaces,which provide useful insight into the 3D nature of the problem,indicate that the influence of Poisson's ratio of adhesive is less than that of elastic modulus on stress distribution of adhesive layer.