Abstract
Adhesive joints are often used in several areas, including offshore systems and automobiles. The development of suitable models to predict the joint behavior has several challenges, especially due to creep phenomena. The aim of this study is to investigate the creep lifetime of single lap joints considering two different adhesives (epoxy and polyurethane). Long-term tests are performed using a pneumatic creep equipment (PCE). The parameters to the creep model are obtained for each adhesive, where load and life span are related. The models obtained and the times of joints life span are compared with two other adhesives previously studied. The results confirm that the knowledge of the lap shear strength value is just a reference to the designer, however experimental tests in creep for each different adhesive is necessary. The comparison between the joints bonded with two different epoxies shows similar results, what was demonstrated by the similar curves obtained by the models. The comparison between polyurethane adhesives did not show similar behavior in the curves obtained from the models, especially in the time of life span.
Highlights
Structural adhesives have been used in several areas in recent years, including civil, automotive and oil and gas
The comparison between the joints bonded with two different epoxies shows similar results, what was demonstrated by the similar curves obtained by the models
The comparison between polyurethane adhesives did not show similar behavior in the curves obtained from the models, especially in the time of life span
Summary
Structural adhesives have been used in several areas in recent years, including civil, automotive and oil and gas. Despite some recent advances in fatigue [3] and fracture [4] modeling of bonded joints adhesives usually present time-dependent stress behavior under static mechanical loading conditions [5], which means that the mechanical properties change over time. For this reason, creep phenomenon must be investigated experimentally aiming to correctly predict the joint behavior until the failure, there is great difficult due to low productivity of results, since common test machine only work with one specimen per time. The primary creep takes place and a high rate of strain over time occurs.
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