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정남용,오봉택,Jeong, Nam-Yong,O, Bong-Taek 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.7
Recentrly advantages in composite and light weight material techniques have led to the increased use of bonded dissimilar materials such as ceramics/metal bonded joints, IC package, brazing, coating and soldering in the various industries. It is required to analyze the evaluation method of fracture strength and design methodology of bonded joints in dissimilar materials. Stress singularity according to changes of scarf angles for bonded scarf joints in dissimilar materials was investigated by the boundary element method and static experiments. In this paper, effect of the stress singularity factors at the interface edges of scarf joints on various dissmilar materials combinations were investigated by analysis of its stress and stress singularity index using 2-dimensional elastic program of boundary element method. And the variations of stress singularity index by changes for Young's modulus ratios of materials and scarf angles were investigated. Also, it is found that stress singularities at bonded interface edges are disappeared for certain combination of scarf angle in a pair of bonded dissimilar materials. As the results, it is proposed that the strength evaluation by using stress singularity factors, $\Gamma$, considering stress singularity at the interface edges of bonded dissimilar materials, is very useful.
정남용,오봉택 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.1
Advantages of adhesively bonded joints and techniques of weight reduction have led to increasing use of structural adhesives such as LSI(large scale integration) package, automobile, aircraft in the various industries. In spite of such wide applications of adhesively bonded joints, the evaluation method of bonding strength has not been established. Stress singularity occurs at the interface edges of adhesively bonded joints and it is required to analyze it. In this paper, the stress singularity using 2-dimensional elastic boundary element method(BEM) with the changes of lap length and adhesive for dingle lap joint was analyzed, and experiments of strength evaluation were carried out. As the results, the evaluating method of bonding strength considering stress singularity at the results, the evaluating method of bonding strength considering stress singularity at the interface edges of adhesively bonded joints and stress intensity factor of interface crack have been proposed in static and fatigue test.
정남용(N.Y.Chung),오봉택(B.T.Oh) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
Recently advantages joining dissimilar materials and light weight material technique have led to. increasing uses of structural adhesives in various industries. In spite of such wide applications of adhesive joints, the evaluation method of bonding strength has not been established.<br/> Stress singularity occurs at the bonded interface edge of adhesive joints and it influences on bonding strength.<br/> In this paper, boundary element method and experimental analysis were investigated according to changes of adherends, lap length and adhesive thickness for single-lap joints.<br/> As the results, a evaluation method of bonding strength considering stress singularity at the bonded interface of adhesive joints has been proposed in stalk test.<br/>