Shear Damage Model Identification for Off-axis IBII Composites Specimen Loaded and Unloaded at High Strain Rates

Abstract

AbstractTesting polymer matrix composites in shear at high strain rates is a difficult task using standard test methods like the Kolsky bar because of the low wave speed and low strain to failure. Moreover, it is well known that such composites exhibit a non- linear response in shear generally attributed to a combination of damage and matrix plasticity. In quasi-static conditions, such models are generally identified by performing cycles of loading and unloading to discriminate damage from plasticity.However, current high strain rate test methods are unable to do this. The present paper details how the new Image-Based Inertial Impact (IBII) test naturally provides loading/unloading and how a damage model can be identified using the Virtual Fields Method from full-field strain and acceleration maps.Key wordsIBII testHigh strain rateCompositeShear damage