Print Email Facebook Twitter Simulating brittle and ductile response of alumina ceramics under dynamic loading Title Simulating brittle and ductile response of alumina ceramics under dynamic loading Author Simons, E.C. Weerheijm, J. Sluys, L.J. Publication year 2019 Abstract Alumina ceramic is often used in armour systems. This material is known to have a brittle response under tensile loading, while a ductile response is found when sufficiently high pressures are reached. During projectile impact a ceramic material experiences both tensile loading and high pressures, hence fails in both a brittle and ductile way. Properly capturing the ceramic failure in a single material model remains challenging. A viscosity regularized Johnson-Holmquist-2 model has been used to simulate dynamic loading on alumina ceramic. The simulations show that the brittle and ductile nature of the material can not be captured simultaneously in the current material model. A new failure strain formulation is proposed where the behaviour under tensile and compressive loading can be controlled independently. This allows to properly capture both the brittle and ductile response of the material in a single constitutive framework, with a single set of model parameters. © 2019 Elsevier Ltd Subject Observation, Weapon & Protection SystemsCBRN - CBRN ProtectionTS - Technical SciencesBrittleCeramicDuctileFailureJohnson-HolmquistAluminaAluminum oxideComputer system recoveryDynamic loadsHigh pressure engineeringTensile stressDynamic loadingsMaterial modelingProjectile impactTensile and compressive loadingCeramic materials To reference this document use: http://resolver.tudelft.nl/uuid:1bf78874-14be-4a5c-b738-6fc4a947cf3c DOI https://doi.org/10.1016/j.engfracmech.2019.05.013/ TNO identifier 867362 Publisher Elsevier Ltd ISSN 1379-44 Source Engineering Fracture Mechanics Document type article Files To receive the publication files, please send an e-mail request to TNO Library.