Effects of grain boundary heterogeneities on creep fracture studied by rate-dependent cohesive model

Yu, Chi; Huang, Chung-Huei; Chen, Chuin Shan; Gao, Yanfei; Hsueh, Chia‐Hsiang

doi:10.1016/j.engfracmech.2012.04.034

Cited by 15 publications

(12 citation statements)

References 31 publications

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“…Rate-dependent and rateindependent models as well as physically based and phenomenological models have been employed. However, to the authors' knowledge, apart from the work of Onck and van der Giessen (1998), van der Giessen and Tvergaard (1994), Thouless et al (1983) and Yu et al (2012) damage zone type models have not been used to study the development of creep damage and/or creep crack growth.…”

Section: Introductionmentioning

confidence: 99%

A theoretical and computational framework for studying creep crack growth

Elmukashfi

Cocks

2017

Int J Fract

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In this study, crack growth under steady state creep conditions is analysed. A theoretical framework is introduced in which the constitutive behaviour of the bulk material is described by power-law creep. A new class of damage zone models is proposed to model the fracture process ahead of a crack tip, such that the constitutive relation is described by a traction-separation rate law. In particular, simple critical displacement, empirical Kachanov type damage and micromechanical based interface models are used. Using the path independency property of the C * -integral and dimensional analysis, analytical models are developed for pure mode-I steady-state crack growth in a double cantilever beam specimen (DCB) subjected to constant pure bending moment. A computational framework is then implemented using the Finite Element method. The analytical models are calibrated against detailed Finite Element models. The theoretical framework gives the fundamental form of the model and only a single quantityĈ k needs to be determined from the Finite Element analysis in terms of a dimensionless quantity φ 0 , which is the ratio of geometric and material length scales. Further, the validity of the framework is examined by investigating the crack

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Section: Introductionmentioning

confidence: 99%

A theoretical and computational framework for studying creep crack growth

Elmukashfi

Cocks

2017

Int J Fract

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“…This proposed model is for 3-dimensional. A slightly simple version has been developed by [17], where the annihilation was not considered, also it is a two-dimensional version.…”

Section: Introductionmentioning

confidence: 99%

“…The grain element has been modelled by simple power law in [3] and [17], both have captured the main features of the creep damage occurring in the grain boundary; sophisticated slip-system model has also been developed and utilized in [10]. Thus, it is justified to adopt simple power law in this type research unless it has been found it is not suitable anymore.…”

Section: Introductionmentioning

confidence: 99%

Development of the FE In-House Procedure for Creep Damage Simulation at Grain Boundary Level

2019

Metals

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A two-dimensional (2D) finite element framework for creep damage simulation at the grain boundary level was developed and reported. The rationale for the paper was that creep damage, particularly creep rupture, for most high temperature alloys is due to the cavitation at the grain boundary level, hence there is a need for depicting such phenomenon. In this specific development of the creep damage simulation framework, the material is modeled by grain and GB (grain boundary), separately, where smeared-out grain boundary element is used. The mesh for grain and grain boundary is achieved by using Neper software. This paper includes (1) the computational framework, the existing subroutines, and method applied in this procedure; (2) the numerical and programming implementation of the GB; (3) the development and validation of the creep software; and (4) the application to simulate plane stress Copper–Antimony alloy. This paper contributes to the development of finite element simulation for creep damage/rupture at a more realistic grain boundary level and contributes to a new understanding of the intrinsic relationship of stress redistribution and creep fracture.

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“…In engineering practice, materials suffer from various types of fracture, such as cleavage, ductile fracture, rupture, and intergranular creep fracture . Some materials are brittle and fragile, whereas others are ductile and deformable .…”

Section: Introductionmentioning

confidence: 99%

Phase‐field‐crystal study on deformation behavior of nanoscale monocrack system in the ductile‐to‐brittle transition region

2019

Fatigue Fract Eng Mat Struct

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Phase‐field‐crystal method is applied to study deformation behavior in the ductile‐to‐brittle transition region of the nanoscale monocrack system in this work. The influence of temperature, crystal orientation angle, and crack shape on the deformation behavior is investigated. Temperature can induce fracture mode change, while crystal orientation angle and crack shape can only affect the specific evolutionary behavior. In the ductile region, if the orientation of a vertex is approximately aligned with a certain close‐packed direction, crack extends shortly in cleavage mode at this vertex, which means cleavage crack propagation can be promoted in a particular range of crystal orientation angle. Additionally, the influence of crack shape is achieved by varying the orientation relationship between crack and lattice structure. In the brittle region, crystal orientation angle impacts on the specific cleavage evolution process, and crack shape can promote or hinder plastic deformation by affecting stress concentration.

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Effects of grain boundary heterogeneities on creep fracture studied by rate-dependent cohesive model

Cited by 15 publications

References 31 publications

A theoretical and computational framework for studying creep crack growth

A theoretical and computational framework for studying creep crack growth

Development of the FE In-House Procedure for Creep Damage Simulation at Grain Boundary Level

Phase‐field‐crystal study on deformation behavior of nanoscale monocrack system in the ductile‐to‐brittle transition region

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