An orthotropic non-local approach to modeling intra-laminar damage progression in laminated composites

[摘要] A non-local macroscopic constitutive model is presented to simulate the progression of intra-laminar damage in laminated composite structures. A novel feature of the model is an orthotropic, non-local averaging scheme that is specially designed to capture the preferred path of damage / fracture propagation in laminated structures consisting of strongly orthotropic layers. In addition to maintaining the objectivity-of-the-numerical results, through-rendering them mesh size and mesh orientation invariant, the orthotropic nonlocal regularization results in a more realistic prediction of damage pattern and damage growth trajectory in orthotropic laminates. The new model, CODAM2, has been implemented in the open source finite element (FE) code, OOFEM, as well as the commercial explicit FE code, LS-DYNA. Numerical examples are presented to demonstrate the capabilities of CODAM2 in predicting the overall response and extent of damage in quasi-statically loaded, notched laminated specimens with various root notch radii ranging from sharp to blunt geometries. The developed methodology serves as a useful tool for robust and efficient inelastic analysis of large-scale composite structures leading to their damage tolerant design. (C) 2019 Elsevier Ltd. All rights reserved.

[发布日期] 2019-12-15

[关键词] Composites;Continuum damage mechanics;Orthotropic non-local regularization;Notched laminated specimens;Explicit finite element analysis