Strength degradation mechanism of epoxy resin structural adhesive under chlorine salt corrosion/freeze-thaw environment
To investigate the effects of salt corrosion/freeze-thaw cycles on the tensile and shear properties of epoxy resin adhesive materials,chlorine salt corrosion/freeze-thaw cycle tests and mechanical performance tests were conducted on 40 adhesives and 40 single-lap joints,respectively,to analyze the variations of their mechanical properties with environmental exposure time.Research shows that as the environmental exposure time increases,the failure mode of all adhesive specimens remains unchanged,while the single-lap joint chan-ges from a mixed failure mode of cohesive failure and interface debonding to an interface debonding failure mode.The tensile strength of the adhesive specimens shows an overall downward trend,with a decrease of 9.2％after 210 chlorine salt corrosion/freeze-thaw cycles.The diffusion rate of water at the interface of sin-gle-lap joints is much higher than that of adhesive specimens,resulting in a more significant decrease in the shear strength of single-lap joints compared with adhesive tensile strength.After 210 chlorine salt corrosion/freeze-thaw cycles,the shear strength decreases by 60.9％.In addition,after 2 160 chlorine salt corrosion/freeze-thaw cycles,the retention rate of adhesive tensile strength is about 31.1％,and the single-lap joint has failed.
万方数据
维普
