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Crack tip microplasticity mediated by microstructure gradients

Journal Article · · Fatigue and Fracture of Engineering Materials and Structures
DOI:https://doi.org/10.1111/ffe.13493· OSTI ID:1788272
 [1];  [2];  [2];  [2]
  1. School of Aerospace, Transport and Manufacturing Cranfield University Bedford MK43 0AL UK
  2. Department of Computational Materials and Data Science Sandia National Laboratories Albuquerque New Mexico NM 87185 USA
Abstract

Traditional fracture theories infer damage at cracks (local field) by surveying loading conditions away from cracks (far field). This approach has been successful in predicting ductile fracture, but it normally assumes isotropic and homogeneous materials. However, myriads of manufacturing procedures induce heterogeneous microstructural gradients that can affect the accuracy of traditional fracture models. This work presents a microstructure‐sensitive finite element approach to explore the shielding effects of grain size and crystallographic orientation gradients on crack tip microplasticity and blunting. A dislocation density‐based crystal plasticity model conveys texture evolution, grain size effects, and directional hardening by computing the constraint from dislocation structures. The results demonstrate that the microstructure can act as a buffer between the local and far fields that affects the crack tip microplasticity variability. For nominal opening loading, grain size and texture affect the local ductility and induce a non‐negligible multiaxial plastic deformation. Furthermore, driving forces based on measuring displacements away from the crack tip are less affected by the microstructure, which suggests that traditional experimental methods smear out important crack tip variability.

Sponsoring Organization:
USDOE
OSTI ID:
1788272
Alternate ID(s):
OSTI ID: 1788275
Journal Information:
Fatigue and Fracture of Engineering Materials and Structures, Journal Name: Fatigue and Fracture of Engineering Materials and Structures Journal Issue: 9 Vol. 44; ISSN 8756-758X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

References (61)

Bioinspired Design Criteria for Damage-Resistant Materials with Periodically Varying Microstructure journal August 2011
Influence of grain size on the mechanical behaviour of some high strength materials journal June 1986
Theory of workhardening 1934-1984 journal December 1985
A numerical study into element type and mesh resolution for crystal plasticity finite element modeling of explicit grain structures journal September 2020
Crack Tip Shielding or Anti-shielding due to Smooth and Discontinuous Material Inhomogeneities journal September 2005
Modeling ductile to brittle fracture transition in steels—micromechanical and physical challenges journal March 2008
Assessment of small fatigue crack growth driving forces in single crystals with and without slip bands journal June 2012
Grain-size effects on tensile behavior of nickel and AISI 316L stainless steel journal October 2003
The computer simulation of microstructural evolution journal September 2001
Predicting Mesoscale Microstructural Evolution in Electron Beam Welding journal March 2016
Influence of polycrystal grain size on fracture toughness of and fatigue threshold in Armco iron journal January 1987
An extension of the self-consistent scheme to plastically-flowing polycrystals journal October 1978
The ductile fracture of metals: A microstructural viewpoint journal May 1983
Theory of plastic deformation: - properties of low energy dislocation structures journal July 1989
Computational crystal plasticity journal January 2000
Physics and phenomenology of strain hardening: the FCC case journal January 2003
Micromechanics-based model for trends in toughness of ductile metals journal January 2003
A dislocation-based model for all hardening stages in large strain deformation journal September 1998
Crack interaction with microstructure journal September 2007
Modeling dislocation storage rates and mean free paths in face-centered cubic crystals journal December 2008
Grain-boundary engineering markedly reduces susceptibility to intergranular hydrogen embrittlement in metallic materials journal August 2009
Modeling size effects on fracture toughness by dislocation dynamics journal January 2010
Overview of constitutive laws, kinematics, homogenization and multiscale methods in crystal plasticity finite-element modeling: Theory, experiments, applications journal February 2010
Improvements of strength and fracture resistance by spatial material property variations journal April 2014
Microstructurally based cross-slip mechanisms and their effects on dislocation microstructure evolution in fcc crystals journal February 2015
Persistent slip bands: Similitude and its consequences journal February 2016
Failure of metals I: Brittle and ductile fracture journal April 2016
An atomistic investigation of the interaction of dislocations with Guinier-Preston zones in Al-Cu alloys journal January 2019
A comprehensive framework for verification, validation, and uncertainty quantification in scientific computing journal June 2011
Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization journal May 2012
Probability-interval hybrid reliability analysis for cracked structures existing epistemic uncertainty journal November 2013
Microstructure-sensitive estimation of small fatigue crack growth in bridge steel welds journal July 2018
Analytical modelling of intragranular backstresses due to deformation induced dislocation microstructures journal May 2008
A perspective on trends in multiscale plasticity journal September 2010
Special rotational deformation and grain size effect on fracture toughness of nanocrystalline materials journal March 2013
On fracture in finite strain gradient plasticity journal May 2016
A three-dimensional cellular automata-crystal plasticity finite element model for predicting the multiscale interaction among heterogeneous deformation, DRX microstructural evolution and mechanical responses in titanium alloys journal December 2016
Crystal plasticity finite element analysis of ferritic stainless steel for sheet formability prediction journal June 2017
Mesoscale cyclic crystal plasticity with dislocation substructures journal November 2017
Multiple slip dislocation patterning in a dislocation-based crystal plasticity finite element method journal January 2018
A rationale for modeling hydrogen effects on plastic deformation across scales in FCC metals journal December 2018
Investigating mesh sensitivity and polycrystalline RVEs in crystal plasticity finite element simulations journal October 2019
On the fracture behavior of inhomogeneous materials––A case study for elastically inhomogeneous bimaterials journal January 2005
Crack growth versus blunting in nanocrystalline metals with extremely small grain size journal February 2009
Effect of inclusion density on ductile fracture toughness and roughness journal February 2014
Crystal plasticity model for BCC iron atomistically informed by kinetics of correlated kinkpair nucleation on screw dislocation journal April 2014
Crystal plasticity finite element modelling of low cycle fatigue in fcc metals journal November 2015
Engineering the crack path by controlling the microstructure journal March 2017
The role of plastic strain gradients in the crack growth resistance of metals journal May 2019
Microstructure and mesh sensitivities of mesoscale surrogate driving force measures for transgranular fatigue cracks in polycrystals journal July 2015
Sensitivity of polycrystal plasticity to slip system kinematic hardening laws for Al 7075-T6 journal February 2017
Scaling laws for dislocation microstructures in monotonic and cyclic deformation of fcc metals journal August 2011
Unravelling the physics of size-dependent dislocation-mediated plasticity journal January 2015
The theory of dislocation-based crystal plasticity journal April 1999
Modern fracture mechanics journal September 2013
Effect of cooperative nanograin boundary sliding and migration on dislocation emission from a blunt nanocrack tip in nanocrystalline materials journal November 2013
The importance of fracture toughness in ultrafine and nanocrystalline bulk materials journal March 2016
Computational modelling of mesoscale dislocation patterning and plastic deformation of single crystals journal May 2015
The determination of the elastic field of an ellipsoidal inclusion, and related problems journal August 1957
Plastic Hinge Model: a Generalization to a Two-Dimensional Situation journal October 1994
Micromechanics Simulations of Fracture journal August 2002

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