A three-dimensional Finite Fracture Mechanics model to predict free edge delamination in angle-ply laminates

• DOI: 10.1016/j.engfracmech.2024.110156
• Publication Date: 2024-05-23T02:32:50Z
• Authors: Mohammad Burhan; Tommaso Scalici; Zahur Ullah; Zafer Kazancı; Giuseppe Catalanotti
• Keywords: Delamination

The layered structures exhibit a weakly singular stress state in the vicinity of free edges, attributable to elastic mismatch adjacent plies, thereby promoting delamination. In present study, this so-called edge effect is investigated for symmetric angle-ply laminates framework Finite Fracture Mechanics (FFM). For given intrinsic properties, such as fracture toughness and strength, computation interlaminar stresses energy release rate imperative evaluation coupled FFM criterion. These quantities are determined terms non-dimensionalised functions employing comprehensive three-dimensional Element Method (FEM) model. Dimensional analysis facilitates finding these all laminate configurations only once while preserving generality functions. A semi-elliptically shaped crack presumed nucleate at dissimilar interface post-crack initiation. Given that, considered has two dimensions, solution 3D model leads an optimisation problem. It hypothesised that homothetic extensions occur, i.e., cracks extend self-similar manner, maintaining constant aspect ratio semi-ellipse. validation purposes, prediction using proposed criterion compared with experimental test results found literature various types (AS1/3501-6, T800/914, G947/M18) layups ([±10n]s, [±15n]s, [±20n]s, [±30n]s). observed close agreement can be achieved between experiments when properties known.