An FFT-based micromechanical model for gradient enhanced brittle fracture

Zecevic, Miroslav

doi:10.1016/j.mechrescom.2025.104455

An FFT-based micromechanical model for gradient enhanced brittle fracture

Journal Article · Tue Jun 03 04:00:00 EDT 2025 · Mechanics Research Communications

DOI:https://doi.org/10.1016/j.mechrescom.2025.104455· OSTI ID:2568913

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Damage models incorporated within FFT-based micromechanical methods have received much attention recently because of the need to better understand and predict brittle and ductile fracture. An important aspect of a damage model is non-local regularization, which removes the mesh dependence of the predictions that otherwise become physically unacceptable upon grid refinement. In this work, the Helmholtz-type equation for non-local gradient regularization of a damage model on a distorted grid is solved using an FFT-based approach. Further, the resulting system of equations is solved using the Jacobi iterative method. The model is applied to simulate brittle fracture of an intermetallic. The influence of the time and space discretization, the length-scale parameter, and intermetallic crystallographic orientation on crack evolution is studied.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2568913

Report Number(s):: LA-UR--24-32550; 10.1016/j.mechrescom.2025.104455

Journal Information:: Mechanics Research Communications, Journal Name: Mechanics Research Communications; ISSN 0093-6413

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Brittle fracture
Continuum damage mechanics
Distorted gird
FFT-based method
Gradient regularization
Intermetallic

An FFT-based micromechanical model for gradient enhanced brittle fracture

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References (24)

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