Invariability of singular stress fields in adhesive bonded joints

• Published in: International journal of fracture Vol. 56; no. 1; pp. 75 - 83
• Main Authors: WEISSBERG, V, ARCAN, M
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.07.1992
• Subjects: Exact sciences and technology; Fundamental areas of phenomenology (including applications); Mechanical contact (friction...); Physics; Solid mechanics; Structural and continuum mechanics; Finite element method; Singularity; Stress analysis; Stress intensity factor; Adhesive joint; Mechanical joint; Comparative study
• ISSN: 0376-9429; 1573-2673
• DOI: 10.1007/BF00042432

A numerical study of the influence of adherend stiffness on adhesive bonded joints provided an insight into some of their fundamental properties. The stress yield in the vicinity of singular locations, in stiff and flexible adherent joints, was investigated. Linear elastic finite element analysis was used to compare the different systems. A special gradual refinement technique in the vicinity of stress singularities was used and proved to be very efficient. Parametric finite element analysis allowed for development of closed form expressions for the distribution in the vicinity of the singular points. The singular stress distribution zone is limited by the adhesive strip thickness. Thus the stress intensity factors are attenuated in comparison with homogeneous bodies. The stress field in the singular region normalized to the developed stress concentration factor, appears to be invariant, and independent of joint configuration. The subsequent invariability leads to a general relationship between the stress concentration factor (SCF) unique for adhesively bonded joints. Aluminum and graphite composites are discussed.