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提出了一种由刚性元和零厚度的内聚力单元组合而成的新型界面单元,该界面单元嵌在板壳结构界面之间,可用来模拟界面损伤的起始和演化,能考虑板壳的平动和转动对分层损伤的作用。该界面单元具有有限厚度,八个结点,每个结点有五个自由度,通过刚性元将板壳单元结点的位移和结点力转换到内部零厚度的内聚力单元上,界面损伤通过内聚力单元的损伤演化体现出来。采用板壳单元和新型界面单元建立有限元模型,对混合弯曲(MMB)试验和双悬臂梁(DCB)弯曲试验进行了计算模拟,计算结果能很好地模拟结构的界面损伤过程。相比传统的用内聚力单元和三维实体单元组成的模型,建模方便,在精度相当的前提下,可以使单元尺寸增大一倍,减少裂尖内聚力区域(cohesive zone)内的单元数量,缩小计算规模,提高计算效率。
A new type of interfacial unit consisting of rigid and zero-thickness coalescence units is proposed. The interfacial unit is embedded in the interface between plate and shell and can be used to simulate the onset and evolution of interface damage. Effect of motion and rotation on delamination injury. The interface element has a finite thickness of eight nodes with five degrees of freedom for each node. The displacement and node forces of the node of the plate and shell element are transferred to the cohesion element with zero thickness through the rigid element. The interface is damaged by The evolution of the cohesion unit damage manifests itself. The finite element model was established by using the shell element and the new interface element. The bending test of mixed bending (MMB) and double cantilever beam (DCB) were simulated. The calculated results can well simulate the interface damage process of the structure. Compared with the traditional cohesion unit and three-dimensional solid unit model, the modeling is convenient, with the same precision, the unit size can be doubled, the number of units in the cohesive zone can be reduced, Calculate the scale, improve the computational efficiency.