Calibration of orthotropic plasticity- and damage models for micro-sandwich materials

Abstract

Article highlights This work describes a methodology for calibrating and simulating micro-sandwich materials, using an anisotropic elasto-plastic constitutive model.A stress-state dependent damage and failure model is calibrated for out-of-plane shear and transverse tensile tests. Experimental T-peels tests are used as a validation case. A great dispersion is found in the force response of the micro-sandwich material, with the highest and lowest force value differing by a factor of approximately 2. Statistical methods are used to analyze the experimental data, and the mean and standard deviation are computed. The numerical models of the T-peel test are able to recreate the response of the experimental data within one standard deviation. It is concluded that statistically based constitutive and damage/failure models should be developed for a full description of the micro-sandwich material studied in the present work.

Keywords

• Micro sandwich
• Hybrix
• Lightweight
• Modeling
• T-peel test