Failure Mode and Failure Strength of Homogeneous Metals &amp; Dissimilar Metals Bonded Single Lap-Shear Joints

Beom Chul Park; Heoung-Jae Chun; Jong Chan Park

doi:10.7734/COSEIK.2019.32.1.1

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2019 Vol.32, Issue 1 Next Page

Failure Mode and Failure Strength of Homogeneous Metals & Dissimilar Metals Bonded Single Lap-Shear Joints 동종금속 및 이종금속 단일 겹침 접착 시편의 파손모드 및 파손강도에 관한 연구

2019. pp. 1-5

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Abstract

In this paper, the experimental study and finite elements analysis were conducted on homogeneous and dissimilar metals single lap-shear bonded joints to investigate the factor that affect the joint failure load. It was found that factors which have the significant effects on the failure load of the joint was stiffness of the adherends. And from experimental results, it can be confirmed that the failure load increases linearly with overlap length increases. And the failure load of dissimilar metal joints is approximately 1KN(10~17%) larger than homogeneous metal joints. In order to confirm this phenomenon, the stress distribution and strain distribution of the specimens were analyzed through the finite element analysis. The difference between homogeneous metals joints and dissimilar metals joints is that stress and strain in adhesive are concentrated at the end of the overlap zone close to aluminium which has lower rigidity than aluminium in case of dissimilar metals joints. From high rigidity of steel, the stress concentration in bonds are decreased and it cause increase of the failure strength at dissimilar metal joints.

Keywords

adhesive

adhesive joint

bonded joint

dissimilar metals joints

homogeneous metals joints

failure mode

failure strength

single lap-shear joint

본 연구는 접착조인트의 파손모드 및 파손강도 연구를 위해 단일 겹침 시편(Single lap shear joint)을 이용하여 해석을 실 시하였다. 알루미늄과 스틸, Araldite 접착제를 이용, 시편을 제작하여 인장시험을 진행하였으며 시험데이터를 이용, 유한요 소해석 결과와 비교 · 분석하였다. 알루미늄과 스틸, 접착제 모두 비선형해석을 통해 정확한 거동을 묘사하고자 하였다. 시험 결과 파단강도는 Overlap length와 Width가 증가함에 따라 선형적으로 증가하였다. 또한 이종재료 조인트의 경우 동종재료 조인트와 비교 시 10~17% 정도의 파손강도 증가를 보였다. 이는 강성이 강한 스틸을 함께 사용함으로써 판재의 굽힘변형 이 줄어들고 이를 통해 본드의 응력집중을 막는 효과를 가져왔기에 나타난 현상으로 분석된다. 유한요소해석을 통한 응력분 포 및 변형률 분포를 분석한 결과 동종재료의 경우 본드 양 끝단, 이종재료의 경우 강성이 약한 판재와 가까운 부분에서 집 중이 발생하였다. 응력집중 및 파손의 주요 인자를 확인하기 위해 본드의 각 성분 별 응력 값을 측정해 본 결과 1-3방향 전 단응력 이 파손의 가장 큰 인자로 분석되었다.

키워드

접착조인트

단일 겹침 조인트

접착

파손모드

이종 재료

이종 접착

이종 조인트

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 32
No :1
Pages :1-5
Received Date : 2018-09-21
Revised Date : 2018-11-12
Accepted Date : 2018-11-13
DOI :https://doi.org/10.7734/COSEIK.2019.32.1.1

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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