The Effects of Temperature Level and Stress-to-Strength Ratio on Creep Behavior of Aluminum-Aluminum Single Lap Adhesive Joints

Polymer-based adhesives undergo creep deformation under constant loading due to their viscoelastic nature. The aim of this study was investigation of the effects of temperature level and stress- to-strength ratio on creep behavior of single lap joints (SLJs) manufactured with adhesive Araldite 2011. Static tensile tests were done on the samples at 40 and 50°C. Then, the tensile creep tests were done at 40 and 50°C and at stress-to-strength ratios of 0.25 and 0.35. With increasing the stress-to-strength ratio from 0.25 to 0.35 at 40°C, the creep displacement and the slope of the second creep stage were increased by 24% and 96.7%, while at 50°C such increase reached to 14.3% and 79.9%, respectively. With increasing the temperature from 40 to 50°C, at the stress-to-strength ratio of 0.25, the creep displacement was increased by 20.6% and the slope of second creep stage increased by 49.5%. Whereas, at the stress-to-strength ratio of 0.35, changing the temperature from 40 to 50°C resulted an increase in the creep displacement by 11.1% and the slope of second creep stage by 36.6%.