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Phase‐field‐crystal study on the crack propagation behavior in a nanoscale two‐dimensional lattice in the presence of nonlinear disturbance strains
Author(s) -
Hu Shi,
Li Jianwei,
Liu Quanyi,
He Yuanhua
Publication year - 2021
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.13539
Subject(s) - materials science , brittleness , fracture mechanics , disturbance (geology) , nonlinear system , amplitude , brittle fracture , nanoscopic scale , phase transition , fracture (geology) , mechanics , condensed matter physics , composite material , nanotechnology , physics , geology , optics , paleontology , quantum mechanics
Abstract The nanoscale crack propagation behavior in the presence of nonlinear disturbance strains is studied by using the phase‐field‐crystal method. The influences of amplitude A and frequency ω on fracture mode and crack growth are discussed. The simulation results suggest that the disturbance strains can make fracture mode change between brittle fracture and ductile fracture. When amplitude A is large, increasing frequency ω will lead to the brittle‐to‐ductile transition (BDT). Further increasing ω can make ductile‐to‐brittle transition (DBT) happen. Meanwhile, the value of A can influence the critical frequencies for BDT and DBT. Crack growth is also affected by the disturbance strains. When ω is small, increasing ω or A can accelerate crack growth. When ω is large enough, increasing A will retard it. Through this work, we provide a new way to effectively explore the nanoscale mechanism and behavior of crack propagation.