Mesoscale modeling of fragmentation of ceramics under dynamic compressive loading

P. H. Geubelle, S. Maiti, K. Rangaswamy

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present the results of a numerical analysis of ceramics under dynamic compressive loading conditions. The analysis is performed at the mesoscale level using a grain-based finite element scheme that accounts for the granular microstructure of the material. An explicit cohesive/volumetric finite element scheme is used to simulate the constitutive and failure response of the ceramic specimen subjected to uniform or impact-induced compressive loading. In this analysis, failure is assumed to be of intergranular nature, i.e., the cohesive elements are placed along the grain boundaries. A rate-independent, damage-dependent cohesive failure model is used to characterize the progressive failure of the cohesive surfaces. Coupling between normal and shear failure is achieved by expressing the normal and tangential components of the cohesive traction vector in terms of the L2 norm of the non-dimensionalized displacement jump vector. Contact between the fracture surfaces and between the fragments is captured through a combination of a cohesive-based and minimization-based contact enforcement schemes. The damage evolution during the fragmentation process is characterized in terms of two different and complementary damage parameters: the first one denotes the appearance and propagation of the distributed damage (or micro-cracks) as cohesive surfaces progressively fail under the effect of the dynamic loading conditions; the second one characterizes the coalescence of the micro-cracks and the creation of fragments. Special emphasis is placed in this paper on the analysis of the frictional contact effect on the initiation, propagation and final extent of the fragmentation process. A detailed parametric analysis is performed to study how the value of the friction coefficient affects the energy absorption process associated with the fragmentation event under various strain rate levels and for different grain sizes.

Original languageEnglish (US)
Title of host publication11th International Conference on Fracture 2005, ICF11
Number of pages6
StatePublished - 2005
Event11th International Conference on Fracture 2005, ICF11 - Turin, Italy
Duration: Mar 20 2005Mar 25 2005

Publication series

Name11th International Conference on Fracture 2005, ICF11


Other11th International Conference on Fracture 2005, ICF11

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology


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