Issue 71

M. Abdulla et alii, Fracture and Structural Integrity, 71 (2025) 124-150; DOI: 10.3221/IGF-ESIS.71.10

Deformation Analysis of Adhesive with Disbond Under Various Loading Conditions In this section, the behaviour of the adhesive volume with a disbond under three different loading conditions: no load, mechanical load, and thermo-mechanical load is examined. The analysis highlights the deformation characteristics of the adhesive volume near the disbond region in each scenario, providing a comprehensive understanding of how various loads impact the integrity of the adhesive with an existing defect. No Load Condition: Under no load conditions, when there is no external mechanical or thermal stress applied to the model, the adhesive volume remains in its original, undeformed state. The grid pattern in Fig. 22 representing this condition outlines the geometric configuration and boundaries of the adhesive layer near the disbonded region. In this state, the adhesive disbond is present, but there is no deformation in the adhesive volume. The absence of deformation indicates that the adhesive and the disbonded region retain their original shapes and sizes, with no induced stresses affecting the material.

Figure 22: Adhesive volume when no load is acting on the model. Mechanical Load Condition: When subjected to mechanical loading, the adhesive volume experiences deformation primarily in the direction of the applied mechanical load. Fig. 23 illustrates the deformation of the adhesive volume under mechanical loading. The grid pattern demonstrates a slight horizontal expansion, indicating the deformation along the y axis, which aligns with the direction of the externally applied mechanical load. The empty grid lines transitioning to filled lines represent this deformation. This deformation, though present, is relatively small compared to thermo-mechanical loading. The mechanical load induces stress within the adhesive, causing it to deform slightly, but the deformation remains mostly aligned with the direction of the applied load.

Figure 23: Deformation in adhesive volume when only mechanical load is acting on the model.

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