In-plane and out-of-plane constraint effects under pressurized thermal shocks

Qian, Guian; González-Albuixech, V.F.; Niffenegger, Markus

doi:10.1016/j.ijsolstr.2013.12.021

Cited by 43 publications

(30 citation statements)

References 41 publications

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“…Fracture initiation under PTS conditions does not depend solely on and the crack tip temperature; it may also be affected by the level of crack tip constraint [15]. The elastic T-stress calculated under linear-elastic conditions provides a qualitative indication of constraint loss [29], [30].…”

Section: Feasibility Of Scaled-specimen Pts Experimentsmentioning

confidence: 99%

“…In general, the most accurate method of analysis is to use elastic-plastic Finite Element Analysis (FEA) of the cracked component, and calculate the J-integral as a function of position on the crack tip line [3]. Many examples of crackedbody FEA applied to PTS events in RPVs exist, including examples of both elastic analysis [15] and inelastic analysis [16], [17]. The elastic-plastic cracked-body FEA approach is used in the current study.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Feasibility Of Scaled-specimen Pts Experimentsmentioning

confidence: 99%

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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“…The studied material is 1.2 MD07 [4,5], which was used for older RPVs. The material constitutive properties are defined by the Young's modulus E and Poisson's ratio m, as well as by the plastic flow curve which depends on the temperature.…”

Section: Finite Element Simulationsmentioning

confidence: 99%

“…The reason that geometry of the structure affects material toughness is attributed to different constraints, which are arisen from different crack tip fields at the same K [4,5].…”

Section: In-plane and Out-of-plane Constraintmentioning

confidence: 99%

“…Cleavage fracture is attributed primarily to slip induced cracking of grain boundary carbides, followed by unstable propagation of the micro cracks into the surrounding ferritic matrix. The potential failure by cleavage fracture is a key issue in the integrity assessment of nuclear installations or components made of ferritic steels [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of constraint and warm prestressing effects by means of a local approach to fracture

Qian

Niffenegger

2015

Engineering Fracture Mechanics

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A study on evaluation of stress intensity factor (K_I) andJ‐integral for 40Ni2Cr1Mo28 alloy (structural steel): analytical and finite element analysis approach

Kumar¹,

Kannan

Pramod

et al. 2022

Materialwissenschaft Werkst

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Defects like crack are common in engineering structures that are either material intrinsic or initiate during fabrication. The theory of fracture mechanics establishes a mechanistic relationship between the maximum allowable loads applied on a structural component to the size and location of an actual or assumed crack in the component. Linear-elastic or complex elastic-plastic, i. e., non-linear models, are used to conduct the fracture analysis. Established studies show that methods of non-linear fracture mechanics, in comparison to elastic methods, offer more accurate measures of the fracture behaviour in failed structures with high toughness and materials with low strength. In this work, an attempt is made to evaluate stress intensity factor-K I and J-integral of 40Ni2Cr1Mo28 alloy (structural application steel) for various crack length-a to width ratio-W (a/W = 0.25, 0.375, 0.5, 0.625 and 0.75) against the applied force in the form of load under plane stress condition by elasto-plastic finite element analysis (compact tension specimen). Non-linearity is modeled using the inverse Ramberg-Osgood relation. Compact tension specimen is modeled in ANSYS software and analyzed by using Finite element analysis. It is found that there is a good agreement between both finite element analysis and theoretical value with an error deviation in the range of 0 % to 6 %.

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In-plane and out-of-plane constraint effects under pressurized thermal shocks

Cited by 43 publications

References 41 publications

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

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

Investigation of constraint and warm prestressing effects by means of a local approach to fracture

A study on evaluation of stress intensity factor (K_I) andJ‐integral for 40Ni2Cr1Mo28 alloy (structural steel): analytical and finite element analysis approach

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In-plane and out-of-plane constraint effects under pressurized thermal shocks

Cited by 43 publications

References 41 publications

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

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

Investigation of constraint and warm prestressing effects by means of a local approach to fracture

A study on evaluation of stress intensity factor (KI) andJ‐integral for 40Ni2Cr1Mo28 alloy (structural steel): analytical and finite element analysis approach

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A study on evaluation of stress intensity factor (K_I) andJ‐integral for 40Ni2Cr1Mo28 alloy (structural steel): analytical and finite element analysis approach