MODELING FAILURE WAVES IN GLASS

Failure waves in glass were first observed in planar impact tests in 1991. Since then they have been further investigated for various glasses and at different laboratories. Kanel et al. introduced a failure wave in a wave code by assuming its existence and propagation from the outset. We propose a model in which the failure wave forms and propagates as part of the overall dynamics. Our model includes two main components: • An equation that relates damage accumulation rate to the damage parameter gradient. • Degradation of the shear modulus as damage accumulates. We incorporated the model in a special purpose 1D plane Lagrange wave code and reproduced data obtained at the Cambridge Impact Laboratory for soda-lime and borosilicate glasses. The agreement we get is quite good.