Ecaillage, cratérisation et comportement en traction dynamique de bétons sous impact : approches expérimentales et modélisation

TL;DRAbstract

Concrete is a material widely used for constructions like bridges, nuclear power stations or bunkers. These buildings can be subjected to dynamic loadings such as industrial accidents or projectile-impacts. Consequently a good knowledge of the mechanical behaviour of concrete is a significant safety issue. This work aims to study the damage mechanisms activated in concrete structures under a projectile-impact or a blast loading. First, numerical simulation of impact tests reveals the significance of the dynamic tensile behaviour of concrete targets to simulate accurately their response under impact. Few test data are available in the open literature for strain rates up to 10^2/s. Nevertheless, these results are dispersed: at 100/s, the dynamic increase factor (DIF, dynamic strength to static strength ratio) varies from 5 for one author to 10 for another. The rate sensitivity of concrete has been studied in LPMM over a wide range of strain rates by means of direct tensile tests on a hig

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