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Influence of local water aging mechanisms on the mechanical behavior of bonded assemblies
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DOI：10.1016/j.ijadhadh.2026.104357.png)
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Abstract
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The objective of this paper is to analyze the constitutive behavior of an adhesive material in presence of water, so as to better predict the mechanical response of bonded assemblies in a marine environment. First, experimental calibration tests are performed with the aim to characterize the long-term behavior of a given adhesive material for different amounts of absorbed water. Then, the problem of a single-lap joint is specially investigated, as it corresponds to the most fundamental bonding configuration. A diffusion model previously identified by the authors is used so as to predict the local water content in the adhesive layer after different immersion times of the assembly. Next, numerical simulations of the single-lap joint under tensile forces are performed. A specific enriched 1D finite element model is developed, which is devoted to the numerical modeling of the overlap region of single-lap joints and provides an accurate description of the stress/strain distributions. A Mahnken-Schlimmer type elastoplastic constitutive law is integrated into the finite element model, whose parameters depend on the water content, enabling the multi-physics modeling of a single-lap joint robustly and efficiently. Finally, for validation purposes, 2D reference finite element simulations using Abaqus software (still considering the effects of water aging) and tensile experimental tests on assemblies are carried out, leading to highly consistent results. In the end, the major finding is that water aging reduces the joint strength in short times, whereas this degradation is partially reversed at longer times, revealing thus a non-monotonic aging behavior.
Keywords:
adhesive material
water aging
single-lap joint
finite element modeling
mechanical behavior
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