On ensuring structural integrity for configurations with stress singularities: a review

Abstract

At the outset in attempting to ensure structural integrity for configurations with stress singularities, it is important to recognize their presence. In addition to the asymptotic identifications of stress singularities available in the literature, the engineer can use divergence checks in numerical stress analysis to this end. After a review of the current state of the art of asymptotic identifications, this paper outlines some divergence checks that can also be effective in this role. Once singularities are recognized, there are four options open to engineers for attempting to ensure structural integrity: relying solely on experimental testing, drawing on the experience of others for like configurations, employing a fracture mechanics approach and removing singular stresses via improved modelling. This paper focuses on the last of these options. With suitable care, the requisite improved modelling can be realized by the introduction of stress‐separation laws. Resulting stresses then offer the potential of comparing with appropriate strengths to obtain structural integrity.

Effect of Loading Frequency on the Fatigue Response of Adhesive Joints up to the VHCF Range

“…Indeed, the scientific and technical interest in detecting, quantifying, and assessing stress-singularities in adhesive joints is demonstrated by several remarkable studies, such as [26,27], two of the oldest studies concerning bi-material wedges [28,29], which concern bi-material coupons; and [30] where stress singularities were analyzed in the frame of a failure initiation. In [31], singularity analyses were performed on joint configurations not explored before; [32][33][34] offered stress evaluations based on stress-singular terms, whereas [35] produced a profound literature review regarding the presence of stress singularities in components and their effects on the structural integrity. Additionally, mixed adhesive joints have been investigated [36], as well as the magnitude of the singular field with respect to the variation in the elastic modulus [37].…”