Load displacement characteristics and interface failure mechanism of butt joint bimaterial

ZHANG Rui zhi, DING Hao, FU Dong lin, CHAI Guo zhong

（Ministry of Education/Zhejiang Province Key Laboratory of Special Purpose Equipment and Advanced 
Manufacturing Technology, Zhejiang University of Technology, Hangzhou 310014, China）


Abstract: Aiming at the problems of insufficient tensile strength and uneven distribution of stress, the bimaterial was experimental studied and theoretical analyzed in the areas of stress strength, stress distribution, load displacement curves, etc. Utilizing the result of the bimaterial of Al/PE, Al/PE, Al/PE, the TS813 bonding samples and the Ergo5800 ones were compared. Then, comparing the elastic modulus and the interface strength of PE, PP, POM, the load displacement curves and fractography were analyzed. The results indicate that the interface strength of bimaterial are decreasing with the increase of elastic modulus, the interface strength of the TS813 bonding samples is the Ergo5800 ones 4.44, 2.17, 2.89 times, while the former of the Al/rubber is the latters 76.47%. The desquamating at different positions of the interface and the phenomenon of fluctuations in the LD curve are led by the uneven interface strength result from the fractography and LD curve, and the interface strength of the sample is lower, the fluctuation is more obvious between the samematerial samples and same bondersamples.

Key words: bi material; fractography; interface strength; load displacement curve;