Special Hybrid Stress Finite Elements for the Analysis of Interface Stress Distribution in Adhesive Joints
ARMY RESEARCH LAB WATERTOWN MA MATERIALS DIRECTORATE
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The widespread application of adhesively bonded joints has necessitated the development of methodology to predict ultimate static joint strength and service life under cyclic loading. Due to the complexity of mathematically modelling adhesive joint response, analytical treatments are limited to highly idealized joint configurations, simplified assumed stress states, applied loading and material behavior. To overcome these limitations, a specialized finite element-based numerical approach is investigated wherein special 2-D and 3-D layered finite elements are formulated to improve the computational efficiency and accuracy of determining stresses in adhesive joints. The hybrid stress technique is used to explicitly enforce stress equilibrium throughout the element domain and stress continuity conditions at layer interfaces. The emphasis of this research is to explore a variety of possible element configurations to assess element performance. The optimum 2-D and 3-D element formulations demonstrate improved performance compared to standard displacement-based finite elements in predicting joint stresses.
- Couplers, Fasteners and Joints