Unraveling the myth of closure corrections: Sharpening the definition of opening and closure stresses with an energy approach

The substantiation of fatigue crack closure corrections is disputed, based on the closure stress definition. The ΔK_eff equation lacks a physical explanation. An inconsistency is observed between the opening stress S_{op_phen} as used by this equation and the physical opening stress S_{op_phys}....

Prediction models for distortions and residual stresses in thermoset polymer laminates: An overview

This paper reviews predictive models developed for the development of residual stresses and shape distortions during the manufacturing of thermoset polymeric/composite materials. Different sources that produce residual stresses and shape changes in the laminated panels are described and reviewed. An overview is presented on the...

On the physics of applying finite width and geometry correction factors in fatigue crack growth predictions of GLARE

In general, a finite width correction to stress intensity factor (SIF) is required in the fatigue crack growth. The finite width correction factor can be explained physically from the energy point of view. It is assumed that the finite width correction factor primarily constitutes an energy correction factor, i.e. it corrects the applied load...

Analytical solutions for crack opening displacements of eccentric cracks in thin-walled metallic plates

In the context of the prevalence of thin-walled metallic aerospace structures, the added resistance to crack propagation offered by a built-up structure is desirable from a damage tolerance standpoint. The analysis of failure in such structures, however, is limited by the lack of crack opening solutions. This paper develops analytical models...

Analytical prediction model for non-symmetric fatigue crack growth in Fibre Metal Laminates

This paper proposes an analytical model for predicting the non-symmetric crack growth and accompanying delamination growth in FMLs. The general approach of this model applies Linear Elastic Fracture Mechanics, the principle of superposition, and displacement compatibility based on the understanding of deformation behaviour in eccentrically...