Numerical predictions and experimental measurements of residual stresses in fatigue crack growth specimens

Lammi, Christopher J.

doi:10.1016/j.engfracmech.2011.01.029

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…The residual stress will influence the FCG behaviours and change the material response to the dynamic loads [9]. Beneficial residual compressive stresses can impede crack initiation and growth [10]. The growth of large and small cracks is associated with a plasticity-induced crack closure model [11].…”

Section: Introductionmentioning

confidence: 99%

Study of fatigue crack growth behaviour of Al-Mg and Al-Mg-Sc-Zr alloys

Jiang

Liu

et al. 2023

Materials Science and Technology

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Fatigue crack growth behaviour of Al-Mg and Al-Mg-Sc-Zr alloys is studied under different orientations and stress ratios. The microstructures and the fracture morphologies of each alloy are observed. For both alloys, they have Brass, S and Goss texture; while only Al-Mg alloy has Cube texture which indicates recrystallisation; as fatigue crack propagated, intergranular fracture transformed into transgranular fracture accompanied with gradually coarser crack surfaces. Al-Mg alloy is featured by large recrystallised grain, favourable plasticity, rougher crack surfaces, and with relatively strong crack growth resistance before rapid growth. While Al-Mg-Sc-Zr alloy with small grain size and relatively smoother crack surfaces, shown cyclic stability at higher Δ K level.

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Section: Introductionmentioning

confidence: 99%

Study of fatigue crack growth behaviour of Al-Mg and Al-Mg-Sc-Zr alloys

Jiang

Liu

et al. 2023

Materials Science and Technology

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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.…”

mentioning

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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“…In addition, residual stresses may induce premature failure through cracking, reduce fatigue strength and induce stress corrosion. Therefore, it is necessary to take measures to prediction and eliminate quenched residual stresses [8,9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Residual Stresses in Quenched High-Strength Aluminum Alloy Ultra-Thick Plates and their Reduction through Single-Side Cold Compression Method

Liu

Wang

Chen

2014

AMR

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Residual stresses developed after quenching of high-strength aluminum alloy ultra-thick plates have an important effect on the quality and reliability of parts, and should be reduction to meet the requirement. In this investigation, numerical techniques of SIMUFACT software are used to simulate residual stresses in quenched 340mm×127mm×124mm Al-Zn-Mg-Cu high-strength aluminum alloy ultra-thick plate, and the results have been verified. On the basis of verified simulation parameters, residual stresses in quenched 4000mm×720mm×285mm ultra-thick plate and their reduction through single-side cold compression method were simulated by SIMUFACT software. After quenching, the value of maximum tension stress located at the interior center of the plate is 200MPa, and the value of maximum compression stress located on the surface of the plate is-169MPa. Through analysis of single-side cold compression processes, it can be concluded that more than 90% quenching residual stresses can be reduced by 1% upsetting ratio and 75% feed of the top die. Residual stresses after compression can be reduced down to the range of-25~9MPa. Mean residual stress values of simulation after compression are identical to the XRD testing data.

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Numerical predictions and experimental measurements of residual stresses in fatigue crack growth specimens

Cited by 6 publications

References 12 publications

Study of fatigue crack growth behaviour of Al-Mg and Al-Mg-Sc-Zr alloys

Study of fatigue crack growth behaviour of Al-Mg and Al-Mg-Sc-Zr alloys

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

Numerical Analysis of Residual Stresses in Quenched High-Strength Aluminum Alloy Ultra-Thick Plates and their Reduction through Single-Side Cold Compression Method

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