Computational crack propagation analysis with consideration of weld residual stresses

Nose, Masahiro; Amano, Hijiri; Okada, Hiroshi; Yusa, Yasunori; Maekawa, Akira; Kamaya, Masayuki; Kawai, Hiroshi

doi:10.1016/j.engfracmech.2017.06.022

Cited by 21 publications

(4 citation statements)

References 49 publications

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“…In the weld joints due to inhomogeneity, the yield strength of the material decreases, 46 moreover, the temperature in the LWRs is too high, hence the plastic strain region increases rendering Alloy 600 a susceptible material to SCC. 47 The tensile normal strain distribution concerning the crack-tip distance is shown in Figure 14. With an increase in the value of hardening exponent the values of plastic strain increase.…”

Section: Effect Of Macrostructural Parameters On Normal Plastic Strainmentioning

confidence: 99%

Effect of Material Macrostructural Parameters on Quantitative Stress Corrosion Cracking Plastic Zone Using Extended Finite Element Method in Welded Joints for Light Water Reactor Environment

et al. 2020

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Alloy 600, a nickel-chromium alloy, has an outstanding corrosion resistance with excellent fabricability and is used in light water reactors(LWRs) at elevated temperatures. The alloy is also being considered for an advanced reactor concept because of its high allowable design strength at the elevated temperature. The Alloy 600 is a power hardening material and basic plastic properties of the alloy are changed in the welded zone due to inhomogeneity in weld joints. The extended finite element method(XFEM) is used in which the problem of variations invariably in the stress intensity factors, K, at a different instant rate exists. This paper focuses on the effect of variations in macrostructural properties of the alloy on stress corrosion cracking(SCC) plastic zone ahead of crack-tip using XFEM.To control the variations in the K, a new technique is also introduced in this research. The results show that the plastic zone is affected by K(increases with the increase of K), yield strength(plastic zone decreases with the increase in yield strength), and hardening exponent ânâ(core region increases with the increase of exponent) of the materials. Simulations are carried in ABAQUS 6.14 and results are compared with experimental data.

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Section: Effect Of Macrostructural Parameters On Normal Plastic Strainmentioning

confidence: 99%

Effect of Material Macrostructural Parameters on Quantitative Stress Corrosion Cracking Plastic Zone Using Extended Finite Element Method in Welded Joints for Light Water Reactor Environment

et al. 2020

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“…It has been found that the distribution of welding residual stress depends on several main factors such as structural dimensions, material properties, restraint conditions, heat input, number of welding pass and welding sequence [10] . Additionally, the uncertainty of welding residual stress measurements and modeling predictions is not well understood [11] . At present, the effect of randomness on the residual stress distribution has rarely been investigated.…”

Section: Introductionmentioning

confidence: 99%

Influence of Material Randomness on Welding Residual Stress in Dissimilar Metal Welded Joints of Nuclear Power Plants

2022

IJFET

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The welding residual stress is one of the main factors that lead to Stress Corrosion Cracking (SCC) in dissimilar metal welded (DMW) joints of the safe-end in nuclear power plants. Based on ABAQUS software, a thermal-elastic plastic finite element method is developed to simulate residual stress for DMW joints of the safe-end. Considering the randomness of material parameters of the welding metal, the neural network response surface method is applied to calculate the change of welding residual stress distribution. Meanwhile, to improve the efficiency of numerical analysis, MATLAB is employed in the secondary development for ABAQUS. With the help of existing experimental data, the effect of random parameters of the welding metal on the residual stress in DMW joints is simulated and analyzed in this study. The results show that the residual stress distribution of the DMW joints is significantly affected by the random parameters. Among the parameters, the randomness of Yield strength and Module of Elasticity has the most significant influence on the uncertainty of the distribution of welding residual stress.

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“…Not focusing on the effect of welding process parameters and microstructural changes, we will concentrate on the effect of welding residual stress on fatigue crack propagation, which should be taken into account for predicting fatigue life. Numerical and experimental analyses of welded joints were performed to understand and describe the effect of residual stress on distributions of the stress intensity factor along the crack front and fatigue crack propagation rate …”

Section: Introductionmentioning

confidence: 99%

“…Numerical and experimental analyses of welded joints were performed to understand and describe the effect of residual stress on Nomenclature: Δa, crack increment; q T , correction function; C, n, m, Paris, Forman material constants; C T , constant in correction function; E, Young modulus; K, stress intensity factor; ΔK, stress intensity factor range; N, number of cycles; R, stress intensity factor ratio; s, crack front coordinate; T, nonsingular T-stress; x, y, z, Cartesian crack tip coordinates; r, θ, polar crack tip coordinates; X, Y, Z, Cartesian global coordinates; ν, Poisson ratio; σ Y , yield stress Subscripts: app, applied; ell, ellipse; max, maximum; min, minimum; res, residual; C, critical distributions of the stress intensity factor along the crack front and fatigue crack propagation rate. [10][11][12][13][14] In spite of significant progress in the study of the effect of welding residual stress on the fatigue crack growth rate, the interpretation of most results is given in terms of the stress intensity factor in the framework of the validity of linear elastic fracture mechanics. It should be noted that other failure theories such strain-based criteria can also be used to predict the fatigue life of welded structures.…”

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confidence: 99%

Fatigue surface crack propagation and intersecting cracks in connection with welding residual stresses

Chernyatin

Matvienko

Razumovsky

2018

Fatigue Fract Eng Mat Struct

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The effect of welding residual stress on surface fatigue crack propagation and fracture mechanics parameters of intersecting orthogonal cracks is discussed. The effect of welding residual stresses on fatigue propagation of the internal surface crack is analysed in the case of welded joint of the pipeline. To predict fatigue crack propagation, the modified Forman law taking into account the nonsingular T‐stress as the crack‐tip constraint has been employed. It is shown by means of numerical simulation (the software ANSYS and MATLAB) that welding residual stress and crack‐tip constraint effects lead to the semielliptical form of final configuration of the surface fatigue crack. Fracture mechanics parameters for intersecting surface cracks, namely, circular and semielliptical cracks in welded joint of the pipeline are also analysed by numerical simulation. It was concluded that welding residual stress intensifies the effect of intersecting orthogonal surface cracks on fracture mechanics parameters including the crack‐tip constraint.

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Computational crack propagation analysis with consideration of weld residual stresses

Cited by 21 publications

References 49 publications

Effect of Material Macrostructural Parameters on Quantitative Stress Corrosion Cracking Plastic Zone Using Extended Finite Element Method in Welded Joints for Light Water Reactor Environment

Effect of Material Macrostructural Parameters on Quantitative Stress Corrosion Cracking Plastic Zone Using Extended Finite Element Method in Welded Joints for Light Water Reactor Environment

Influence of Material Randomness on Welding Residual Stress in Dissimilar Metal Welded Joints of Nuclear Power Plants

Fatigue surface crack propagation and intersecting cracks in connection with welding residual stresses

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