论文部分内容阅读
建立了非对称胶接接头位移理论,它能严格满足包括胶层端头剪应力为零在内的所有边界条件。由于上被粘物、下被粘物具有不同材料和厚度,研究非对称胶接接头更具一般性。以位移理论解为基础,通过一组特定位移约束条件确立了被粘物纵向和横向位移函数,获得了非对称T形、L形和单搭接接头简化有限元单元的单元刚度矩阵。这些胶接接头简化单元能大幅降低整体有限元模型的自由度数量,避免以往胶层单元胶层厚度估计过大的不足,并考虑了被粘物间连续传力的特性,更适于大型有限元模型中对胶接接头的简化建模。精细有限元模型的数值验证表明,三种胶接接头简化有限元单元精度很好,使其应用到诸如汽车白车身、飞机等大型有限元模型中成为可能。
The asymmetric cement joint displacement theory is established, which can strictly satisfy all the boundary conditions including zero shear stress at the end of the rubber layer. Due to the different materials and thicknesses of the top and bottom adherends, it is more general to study asymmetric cement joints. Based on the displacement theoretical solution, the longitudinal and transverse displacement functions of the adherent were established by a set of specific displacement constraints, and the element stiffness matrix of the simplified finite element element with asymmetric T-shape, L-shape and single-lap joints was obtained. The simplified joints of these adhesive joints can greatly reduce the number of degrees of freedom of the overall finite element model and avoid the over-estimation of the previous layer thickness of the glue layer unit, taking into account the continuous force transmission between the adherends and the large-scale limited Simplified Modeling of Bonded Joints in Metamodel. The numerical simulation of the fine finite element model shows that the three kinds of plastic joints simplify the accuracy of the finite element unit and make it possible to apply it to large-scale finite element models such as automobile body-in-white and aircraft.