The numerical wedge splitting tests show that in the case of brittle materials, the lower post-failure stress limit defined in the concrete damaged plasticity model resulted in energy consumption for crack propagation exceeding the defined fracture energy (114% higher in the case of a brittleness number of ). | International Journal of Mechanical Sciences 197 2021 106345 Contents lists available at ScienceDirect International Journal of Mechanical Sciences journal homepage locate ijmecsci A comparison of two damage models for inverse identification of mode fracture parameters Case study of a refractory ceramic Soheil Samadi Shengli Jin Dietmar Gruber Harald Harmuth Ceramics Montanuniversitaet Leoben 8700 Austria a r t i c l e i n f o a b s t r a c t Keywords Fracture behavior of refractories influences their durability in high-temperature applications to a great extent. The Damaged elasticity fictitious crack model has been used for simulation of the fracture process of refractories and concrete materials. Finite element analysis The present study investigates the effect of the lower post-failure stress limit of the softening law in the fictitious Wedge splitting test crack model by comparing an in-house developed subroutine for damaged elasticity model with the concrete Ceramics damaged plasticity model implemented in Abaqus. The numerical wedge splitting tests show that in the case of brittle materials the lower post-failure stress limit defined in the concrete damaged plasticity model resulted in energy consumption for crack propagation exceeding the defined fracture energy 114 higher in the case of a brittleness number of . Therefore the developed damaged elasticity model allows for a more accurate simulation of fracture since the lower post-failure stress limit was decreased to of the tensile strength. Moreover an inverse evaluation of the fracture parameters of an alumina spinel refractory material supported the developed model. 1. Introduction Que and Tin-Loi 12 reported that with increasing the number of lin- ear parts in the multi-linear softening law the ultimate displacement in Refractories are composite ceramic materials often used as lining the softening law and the accuracy of the fit increased. Several research materials in various .
