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Shape Design of Adhesive Joints for Strength Improvement of Epoxy Adhesive Structures

에폭시 접착제 접합구조물의 강도향상을 위한 접착부 형상설계

  • 서도원 (전북대학교 공과대학 기계설계학과) ;
  • 김효진 (전북대학교 공과대학 기계설계학) ;
  • 임재규 (전북대학교 기계항공시스템공학부, 공학연구원 공학기술연구센터)
  • Published : 2004.06.01

Abstract

Adhesive-bonded joints are widely used in the industry. Recently, applications of adhesive bonding joints have been increased extensively in automobile and aircraft industry. The strength of adhesive joints is influenced by the surface roughness, adhesive shape, stress distribution, and etc. However, the magnitude of the influence has not yet been clarified because of the complexity of the phenomena. In this study, as the fundamental research of adhesive bonding joints, the effects of adhesive shape and loading speed on bonding strength properties and durability of aluminum to polycarbonate single-lap joints were studied. To evaluate the effect of adhesive shape, several modified shapes were used, and loading speeds were varied from 0.05 to 5 mm/min. As a result, the load-displacement distribution was shown a brittle fracture tendency. The trigonal edged single lap and bevelled lap joints showed the higher strength than the plain single lap, trigonal single lap, joggle lap and double lap joints in same adhesive area. The fractures of trigonal single lap and trigonal edged single lap joints that had the higher strength level were shown as the mixture type of the cohesive and interfacial-failure, mostly joggle lap joints that had the lower strength level were shown as the adhesive-failure.

Keywords

Adhesive Joint;Adhesive Strength;Adhesive Shape;Loading Speed;Surface Treatment;Lap Joint

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