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http://dx.doi.org/10.7234/kscm.2006.19.4.015

Fracture Mechanical Characterization of Bi-material Interface for the Prediction of Load Bearing Capacity of Composite-Steel Bonded Joints  

Kim, Won-Seok (한국과학기술원 기계공학과)
Shin, Kum-Chel (현대자동차 고분자 재료 연구팀)
Lee, Jung-Ju (한국과학기술원 기계공학과)
Publication Information
Composites Research / v.19, no.4, 2006 , pp. 15-22 More about this Journal
Abstract
One of the primary factors limiting the application of composite-metal adhesively bonded joints in structural design is the lack of a good evaluation tool for the interfacial strength to predict the load bearing capacity of boned joints. In this paper composite-steel adhesion strength is evaluated in terms of stress intensity factor and fracture toughness of the interface corner. The load bearing capacity of double lap joints, fabricated by co-cured bonding of composite-steel adherends has been determined using fracture mechanical analysis. Bi-material interface comer stress singularity and its order are presented. Finally stress intensities and fracture toughness of the wedge shape bi-material interface corner are determined. Double lap joint failure locus and its mixed mode crack propagation criterion on $K_1-K_{11}$ plane have been developed by tension tests with different bond lengths.
Keywords
adhesively bonded joint; bi-material interface; stress intensity factor; co-cured double lap joint;
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