The treatment of thermal and residual stresses in fracture assessments

Ainsworth, R.A.

doi:10.1016/0013-7944(86)90008-1

Cited by 67 publications

(43 citation statements)

References 5 publications

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“…Due to plasticity and relaxation effects the resulting K factor does no longer equal the sum of p I K and s I K . As a consequence an additional correction term V has to be applied following a concept originally introduced in [144]. Eq.…”

Section: Specific Problems Of Welded Structures (A) Welding Residual mentioning

confidence: 99%

Fracture and damage mechanics modelling of thin-walled structures – An overview

Zerbst¹,

Heinimann

Donne³

et al. 2009

Engineering Fracture Mechanics

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Section: Specific Problems Of Welded Structures (A) Welding Residual mentioning

confidence: 99%

Fracture and damage mechanics modelling of thin-walled structures – An overview

Zerbst¹,

Heinimann

Donne³

et al. 2009

Engineering Fracture Mechanics

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“…It is seen that, in this case, the total J values for the combined thermal and mechanical loading are very similar. Schemes for estimating the total J have been discussed in [5] and [6]. For small amounts of plasticity, simple superposition may be used.…”

Section: J Results For Thermomechanical Loadingmentioning

confidence: 99%

“…The good agreement between the J estimate and total J is evident up to PIP0 G 0.8. For higher levels of load it was proposed in [5] that a modified reference load be used to account for the effect of the thermal loading on the total J , the effectiveness of such an approach was not investigated here. …”

Section: J Results For Thermomechanical Loadingmentioning

confidence: 99%

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Effect of Thermomechanical Loading on Near Tip Constraint

O’Dowd

Sumpter²

1996

J. Phys. IV France

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Abstract. Two parameter approaches to elastic-plastic fracture mechanics were introduced to remove some of the conservatism inherent in the one parameter approach based on the J integral, ([I]) and to account for constraint effects on fracture toughness. It was shown in [Z], [3] and [4] among others that much of the dependence of fracture toughness on specimen geometry could be explained by two parameter fracture theories based on Q or T. This paper examines the effect of residual or thermal stress fields on constraint in a mechanically loaded body. Finite element analyses of representative thermal loadings which give rise to high and low constraint stress fields (high and low T o r Q) have been conducted. The structure is then subjected to mechanical loading, both tension and bending dominated to assess the effect on the near tip constraint. It is observed that the two parameter structure of the fields is maintained and values of Q stress have been obtained from the analyses. The thermal loading initially has a strong effect on the Q value but at higher loads when the mechanical loading dominates, this effect is much weaker. The ability of a two parameter approach using the T stress to account for constraint is assessed

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“…In many cases, pre-existing residual stresses contribute further to the secondary loading experienced by the component. The effects of primary and secondary loading on elastic-plastic fracture combine in a non-linear manner [11], [12]. The amount that secondary loading contributes to the crack-driving force depends on the nature of the fracture process; i.e.…”

Section: Introductionmentioning

confidence: 99%

Parametric design of scaled-down pressurised thermal shock test specimens using inelastic analysis

Coules

Orrock²,

Truman³

2017

Engineering Fracture Mechanics

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractPressurised thermal shock tests that simulate fracture conditions relevant to nuclear reactor pressure vessels are difficult to perform and require very large specimens. This study examines the feasibility of scaled-down specimens to allow easier testing. A series of finite element models was used to design scaled-down specimens that produce a crack-driving force, crack tip temperature trajectory and constraint conditions very similar to those which occurred in a previous large-scale spinning cylinder experiment known as NESC-1. It is shown that equivalent conditions can be achieved in much smaller specimens than NESC-1 using a practical set of testing parameters.Keywords: Thermal shock, finite element analysis, pressure vessel, spinning cylinder, J-integral Graphical abstractHighlights  Thermal shock tests for nuclear reactor pressure vessels can be miniaturised.  Models show that scaled-down tests can give equivalent fracture initiation conditions.  Specimens equivalent to the NESC-1 thermal shock test have been designed.

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The treatment of thermal and residual stresses in fracture assessments

Cited by 67 publications

References 5 publications

Fracture and damage mechanics modelling of thin-walled structures – An overview

Fracture and damage mechanics modelling of thin-walled structures – An overview

Effect of Thermomechanical Loading on Near Tip Constraint

Parametric design of scaled-down pressurised thermal shock test specimens using inelastic analysis

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