Numerical analysis of retained residual stresses in C(T) specimen extracted from a multi-pass austenitic weld and their effect on crack growth

Muránsky, Ondrej; Smith, Marcus; Bendeich, Philip J.; Hosseinzadeh, Foroogh; Edwards, L.

doi:10.1016/j.engfracmech.2014.04.008

Cited by 14 publications

(8 citation statements)

References 34 publications

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“…It is of technological importance to know the magnitude and direction of these WRS, as they can superimpose on operational stresses and thus contribute to premature failure of the welded component or structure [1,2]. It has also been shown that WRS can provide the driving force for crack initiation and growth [3], thereby affecting the service lifetime of a welded structure.…”

Section: Introductionmentioning

confidence: 99%

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The influence of constitutive material models on accumulated plastic strain in finite element weld analyses

Muránsky

Hamelin

Patel

et al. 2015

International Journal of Solids and Structures

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Please cite this article as: Muránsky, O., Hamelin, C.J., Patel, V.I., Luzin, V., Braham, C., The influence of constitutive material models on accumulated plastic strain in finite element weld analyses, International Journal of Solids and Structures (2015), doi: http://dx. AbstractRecent studies in computational weld mechanics have revealed the importance of the material plasticity model when predicting weld residual stresses. The present work seeks to extend this level of understanding to include the effects of the assumed material annealing behaviour, particularly when modelling multi-pass welds that comprise several thermo-mechanical loading cycles. A series of numerical analyses are performed to examine the variability in predicted residual stress profiles for different material models, using a validated finite element model for a three-pass slot weld in AISI 316LN austenitic steel. The material models consider both the work hardening and annealing assumptions for the chosen material. Model sensitivity is established not only from a weld residual stress perspective, but also from an assessment of the post-weld plastic strain accumulated in the weldment. Predictions are compared with indirect measurements acquired using crossweld micro-hardness maps taken from benchmark specimens. Sensitivity studies reveal that the choice of annealing behaviour will have a significant impact on plastic flow predictions, which is dependent on the annealing temperature specified. Annealing assumptions will have a varying impact on the weld residual stress predictions, such that the extent of sensitivity is dependent on the plasticity model chosen. In contrast, the choice of plasticity model will have a significant effect on the predicted weld residual stresses, but relatively little effect on predictions of equivalent plastic strain.

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Section: Introductionmentioning

confidence: 99%

“…Density (ρ), thermal conductivity (λ), and specific heat (c p ) 3. Young's modulus (E), Poisson's ratio (ν), and work-hardening behaviour 4.…”

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confidence: 99%

The influence of constitutive material models on accumulated plastic strain in finite element weld analyses

Muránsky

Hamelin

Patel

et al. 2015

International Journal of Solids and Structures

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“…Residual stresses that arise within the weld structure can affect the failure life predictions in a CT specimen with tensile ones assisting crack opening and compressive residual stresses reducing the crack growth rate. 37,38 Thus, the following residual stress compensation expression for reference stress C * -value is suggested by Nikbin 34…”

Section: Ct Specimenmentioning

confidence: 99%

Practical considerations of the use of cross-weld and compact tension specimens’ creep data

Petkov

Hyde

2016

The Journal of Strain Analysis for Engineering Design

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The present article gives an overview of the use of cross-weld and compact tension specimen modelling and analyses data to characterise creep behaviour of high temperature components. Cross-weld and CT specimens are used to describe creep crack growth in heterogeneous material structures, such as welds, and a number of factors that affect the creep behaviour of the structure, associated with this heterogeneity, have been identified. Creep data obtained from cross-weld specimen modelling is substantially affected by the material model used (e.g. Norton Power law, Liu/Murakami model, etc.), stress singularities that arise at the material interfaces and in between the columnar and equiaxed zones of the weld material, residual stresses which arise though the thickness of a multi-pass weld and the extraction orientation of the specimen relative to the welding direction. Creep crack growth data obtained from CT specimen testing and analyses is strongly dependent on the material models used (isotropic hardening models, Norton Creep law, Liu/Murakami model, etc.), the path-dependence of the C*-contour integral fracture parameter for certain heterogeneous material configurations and the accurate computation of material constants for damage mechanics models, and the agreement between loading state to the actual stress state of the component to which the CT specimen creep data is applied to. The present study examines typical results and observations from cross-weld specimen and CT specimen creep analyses, identifying the advantages, disadvantages and limitations of each specimen procedure.

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“…The specimen thickness constraint [22] and multi-axial states of stress [23,24] the pre-straining of the notched CT specimen, but the obtained residual stress is different from that in the actual complex weld structure. If we cut the CT sample directly from the macro weld joint, the residual stress will be relaxed [25] and leads to inaccurate prediction. Shi et al [26] found the life of heat treated brazed joints is longer than that of non-heat treated braze joints because the residual stress has been decreased by the heat treatment, which confirms the importance of an accurate calculation of residual stress in creep damage analysis.…”

Section: Introductionmentioning

confidence: 99%

Creep damage and crack initiation in P92–BNi2 brazed joint

Jiang

Zhang

et al. 2015

Materials & Design

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Numerical analysis of retained residual stresses in C(T) specimen extracted from a multi-pass austenitic weld and their effect on crack growth

Cited by 14 publications

References 34 publications

The influence of constitutive material models on accumulated plastic strain in finite element weld analyses

The influence of constitutive material models on accumulated plastic strain in finite element weld analyses

Practical considerations of the use of cross-weld and compact tension specimens’ creep data

Creep damage and crack initiation in P92–BNi2 brazed joint

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