Multiscale Simulation of Dynamic Fracture in Polycrystalline SiC-Si3N4 Using a Molecularly Motivated Cohesive Finite Element Method

2007 ◽  
Author(s):  
Vikas Tomar
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Fracture ◽  
Multiscale Simulation ◽  
Element Method

Micromechanical Simulation of Dynamic Fracture Using the Cohesive Finite Element Method

2004 ◽  
Vol 126 (2) ◽  
pp. 179-191 ◽  
Author(s):  
Jun Zhai ◽  
Vikas Tomar ◽  
Min Zhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Fracture ◽  
Phase Distribution ◽  
Two Phase ◽  
Fracture Patterns ◽  
Phase Size ◽  
Microstructural Morphology ◽  
Actual Material ◽  
Element Method

Dynamic fracture in two-phase Al2O3/TiB2 ceramic composite microstructures is analyzed explicitly using a cohesive finite element method (CFEM). This framework allows the effects of microstructural heterogeneity, phase morphology, phase distribution, and size scale to be quantified. The analyses consider arbitrary microstructural phase morphologies and entail explicit tracking of crack growth and arbitrary fracture patterns. The approach involves the use of CFEM models that integrate cohesive surfaces along all finite element boundaries as an intrinsic part of the material description. This approach obviates the need for any specific fracture criteria and assigns models the capability of predicting fracture paths and fracture patterns. Calculations are carried out using idealized phase morphologies as well as real phase morphologies in actual material microstructures. Issues analyzed include the influence of microstructural morphology on the fracture behavior, the influence of phase size on fracture resistance, the effect of interphase bonding strength on failure, and the effect of loading rate on fracture.

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