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Meshless modeling of mixed-mode fracture propagation in double lap adhesive joints
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DOI：10.1016/j.ijadhadh.2026.104336.png)
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Abstract
En 中文
Structural adhesive joints are extensively employed in the automotive and aircraft industries. These types of joints are commonly designed and simulated using well-developed commercial software, incorporating techniques based mostly on Finite Element Methods (FEM). Meshless methods provide an alternate approach to the numerical discretization of the problem domain, and approximation of the field variables, which overcomes the mesh dependency in the FEM. In this work, the Radial Point Interpolation Method (RPIM) is presented to analyze adhesively bonded Double Lap Joints (DLJ) under mixed-mode fracture conditions. Using the RPIM permits to discretize the problem domain into a set of field nodes, eliminating the need for a well-conditioned element mesh connecting the nodes. Therefore, element distortion is circumvented and local remeshing of the crack tip is expedited. The concept of influence domains to enforce nodal connectivity in the RPIM permits the construction of smooth and stable shape functions, even in the crack tip region. The Stress Intensity Factors (SIFs) are obtained using the interaction integration, allowing to implement the mixed-mode critical energy release rate criterion. Although the adhesive material is considered linear-elastic, the numerical results can predict experimental data obtained from tested DLJs with a 3.6% deviation when considering the joint with smaller overlap length and optimal criterion exponent.
Keywords:
Mixed-mode fracture
Meshless method
Double-lap joints
Stress intensity factors
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