Numerical analysis of a testing technique to investigate the dynamic crack propagation in armour ceramic

Abstract : Ceramic materials are numerically studied to understand their fracturing behaviour upon dynamic conditions and impact loadings. During a ballistic impact of a projectile against a ceramic armour system, an intense fragmentation composed of numerous oriented cracks, develops in the target. It is the reason why the conditions of crack initiation, propagation and arrest in these materials need to be investigated. In the present work, a dynamic testing configuration has been developed in order to characterise the dynamic fracture toughness (K_I,d), considering a single crack that propagates from the specimen notch tip. The "Rockspall" testing technique, which employs a two-notch specimen loaded in a spalling experiment, was used. Thanks to the reflection of a compression wave into a tensile load from the sample free-end, a single dynamic crack is triggered. The sample geometry is optimised by means of a series of FE numerical simulations involving an anisotropic damage model.
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Submitted on : Monday, January 28, 2019 - 2:16:24 PM
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Yannick Duplan, Pascal Forquin, Bratislav Lukić, Dominique Saletti. Numerical analysis of a testing technique to investigate the dynamic crack propagation in armour ceramic. DYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading, DYMAT (association); Commissariat à l'énergie atomique et aux énergies alternatives (CEA); Palais des Congrès d'Arcachon, Sep 2018, Arcachon, France. pp.Modelling and Numerical Simulation, ⟨10.1051/epjconf/201818302039⟩. ⟨hal-01996479⟩

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