Abstract
Fracture and fatigue assessment of structures weakened by multiple site damage (MSD) currently represents a challenging problem. Here, we communicate the outcomes of an experimental study conducted on a plate weakened by two closely-spaced collinear cracks, which represents the simplest form of MSD. The experimental results are used to verify the predictions of a recently developed theoretical approach.
Highlights
multiple site damage (MSD) can undermine the overall strength and integrity of a structure
The results presented in this figure were normalised by the flow stress, or
The shift of the dotted lines highlighted by an arrow in Fig. 2a demonstrates the effect of plate thickness on the local plastic collapse conditions
Summary
MSD can undermine the overall strength and integrity of a structure. Due to the presence of mutual interaction between multiple cracks, the residual strength of structures with MSD can be significantly lower than those of structures with non-interacting cracks [1,2,3,4]. Advanced analytical approaches for the analysis of multiple crack problems are often based on the strip yield model, which was originally introduced by Dugdale [5] and Barenblatt [6]. The popularity of this model is due to the relative simplicity of the mathematical formulation, which allows for easy computation of various fracture controlling parameters, such as the crack tip opening displacement. In [12], a theoretical model was developed to investigate the local plastic collapse conditions for a finite thickness plate weakened by two collinear cracks, based on the classical strip yield model and plasticity induced crack closure concept. Effect of the crack interaction and the plate thickness on the plastic collapse of the ligament between two closely spaced collinear cracks is investigated experimentally
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