Abstract
A computational formulation able to simulate crack initiation and growth in layered structural systems is proposed. In order to identify the position of the onset interfacial defects and their dynamic debonding mechanisms, a moving mesh strategy, based on Arbitrary Lagrangian-Eulerian (ALE) approach, is combined with a cohesive interface methodology, in which weak based moving connections are implemented by using a finite element formulation. The numerical formulation has been implemented by means of separate steps, concerned, at first, to identify the correct position of the crack onset and, subsequently, the growth by changing the computational geometry of the interfaces. In order to verify the accuracy and to validate the proposed methodology, comparisons with experimental and numerical results are developed. In particular, results, in terms of location and speed of the debonding front, obtained by the proposed model, are compared with the ones arising from the literature. Moreover, a parametric study in terms of geometrical characteristics of the layered structure are developed. The investigation reveals the impact of the stiffening of the reinforced strip and of adhesive thickness on the dynamic debonding mechanisms.
Highlights
During the last decades, layered structures in the form of laminates or thin films have employed extensively in many engineering fields, ranging from nano to macro scale applications
From the physical point of view, they represent the portion in which the traction separation laws are distributed. Since those regions are assumed to be moved rigidly, by means of the Arbitrary Lagrangian-Eulerian (ALE) strategy, the nonlinearities involved by the traction forces may be reduced to a small region close to the crack tip, avoiding as a result spurious and oscillatory effects typically documented in pure Cohesive Zone Model (CZM)
In order to validate the procedure to describe the crack front speed, dynamic debonding mechanisms concerning a FRP strengthened steel beam specimen have been investigated by means comparisons with numerical results arising from the literature
Summary
During the last decades, layered structures in the form of laminates or thin films have employed extensively in many engineering fields, ranging from nano to macro scale applications. The formulation of the governing equations for the ALE and interface approach is presented and, subsequently, the numerical implementation of the finite element model is reported.
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