Effect of pre-water immersion period on fatigue resistance of adhesive bonded thin steel

In this study, two types of adhesive bonded joints whose base materials are JIS SPCC590Y and JIS SUS316, respectively, were examined to determine the fatigue strength and fracture morphology after water immersion. The fatigue strength and cohesive failure rate of the adhesive bonded joints with JIS SPCC590Y adherends significantly decreased, with a similar tendency to that of the static tensile test. However, the fatigue strength of the JIS SUS316-adherend joints decreased slightly, and the cohesive failure rate increased. Oxides, etc., were generated at the bonding interface after long-term use in structures that were adhesively bonded to adherends such as JIS SPCC590Y with poor corrosion resistance, and the bonded interface strength rapidly decreased. By contrast, for the adherends with excellent corrosion resistance, interfacial failure did not occur but cohesive failure did; as a result, both static and fatigue presented high strength.

Automated summary

Two types of adhesive bonded joints with different base materials were tested for fatigue strength and fracture morphology after water immersion. The fatigue strength of the joints with JIS SPCC590Y adherends significantly decreased, while the joints with JIS SUS316 adherends showed a slight decrease in fatigue strength and an increase in cohesive failure rate. Oxides were generated at the bonding interface in structures bonded to JIS SPCC590Y, leading to rapid decrease in bonded interface strength. In contrast, for adherends with excellent corrosion resistance, interfacial failure did not occur but cohesive failure did, resulting in high static and fatigue strength.