Keynote paper: Non local damage model with evolving internal length based on micromechanics

A modified non local damage model with evolving internal length based on micromechanics is developed in this contribution. It is shown in particular that the non local influence between two points depends on the value of damage at each point. The resulting weight function is non symmetric and truncated, which prevents a widening of the FPZ in the course of failure. The finite element implementation on a one dimensional problem is presented, focusing on the variation of the weight function. Comparisons with experimental data on model materials with controlled porosity are recalled. Acoustic emission analyses provide results with which the theoretical model is consistent qualitatively. This model opens also the path for durability mechanics analyses where it has been demonstrated that the internal length in the non local model should change.