Determination of Residual Stresses and the Resulting Stress Intensity Factors in the Ligament of Pre-Cracked Plates

Schindler, Hans-Jakob; Finnie, I.

doi:10.1016/b978-0-08-042820-8.50063-7

Cited by 8 publications

(16 citation statements)

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“…In the present investigation, a detailed analysis of the fatigue crack propagation in residual stress field is presented. The compression residual stresses present in highly overloaded blunt‐notched C(T) specimens were measured by the cut‐compliance method 19–21 …”

Section: Introductionmentioning

confidence: 99%

Fatigue crack propagation assessment based on residual stresses obtained through cut‐compliance technique

Ghidini

Donne²

2006

Fatigue Fract Eng Mat Struct

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A B S T R A C T Crack growth rate versus crack length curves of heavily overloaded parent material specimens and fatigue crack propagation curves of friction-stir-welded aluminium samples are presented. It is shown that in both cases the residual stresses have a strong effect on the crack propagation behaviour under constant and variable amplitude loading. As a simplified engineering approach, it is assumed in this paper, that in both cases residual stresses are the main and only factor influencing crack growth. Therefore fatigue crack propagation predictions are performed by adding the residual stresses to the applied loading and by neglecting the possible effects of overloading and friction stir welding on the parent material properties. For a quantitative assessment of the residual stress effects, the stress intensity factor due to residual stresses K res is determined directly with the so-called cutcompliance method (incremental slitting). These measurements are particularly suited as input parameters for the software packages AFGROW and NASGRO 3.0, which are widely used for fatigue crack growth predictions under constant and variable amplitude loading. The prediction made in terms of crack propagation rates versus crack length and crack length versus cycles generally shows a good agreement with the measured values.

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Section: Introductionmentioning

confidence: 99%

Fatigue crack propagation assessment based on residual stresses obtained through cut‐compliance technique

Ghidini

Donne²

2006

Fatigue Fract Eng Mat Struct

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“…3) is zero, leading to a finite Kt value even at the special point where the denominator in eq (4b) is zero. Applying eq (9) to the strains measured at M1 and eq (14) to the strains measured at M2 as shown in Fig. 6 results in the curve Klrs(a/D) shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In several cases, as shown in Ref. 13 and by examples in the next section, the desired analytical solutions for (YyF (X, S) and…”

Section: Determination Of Influence Functionsmentioning

confidence: 99%

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Experimental determination of stress intensity factors due to residual stresses

Schindler

Wan

Finnie

1997

Experimental Mechanics

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An experimental method is presented that enables stress intensity factors due to residual stress to be determined directly, without prior determination of the residual stress. The method is based on the crack compliance method, where a narrow cut is introduced progressively into the considered component, and the resulting strain change is measured by a strain gage. The required mathematical relations to determine stress intensity factors from strain measurements are established by means of some basic relations of linear elastic fracture mechanics. They are derived explicitly for two exemplary geometrical systems, which allowed for analytical treatment. Experimental data obtained in the case of a steel roller are presented and discussed.

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“…The CCM is used worldwide and it has been applied to various geometries. The most common specimens examined are beams and cylinders [4, 8] and [9] which can be either solid or hollow [10]. Other geometries that can be tested include rectangular bars and brackets welded to a plate [11–13].…”

Section: Introductionmentioning

confidence: 99%

Residual Stresses in Beams (With and Without Prior History) Numerically Assessed by the Crack Compliance Method

Urriolagoitia-Sosa

Urriolagoitia-Calderón

Pineda

et al. 2011

Strain

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This work assesses the Crack Compliance Method (CCM) by the Finite Element Method (FEM). The CCM is a very powerful method that is based on Fracture Mechanics Theory. Its experimental application and set up is validated by this work. The numerical assessment of the CCM is performed on bending beams with and without prior straining history, to determine the best position and orientation of strain gauges, as well as the optimum number of readings. The prior straining history condition, in the analyzed components, is induced by an axial pulling before the beam is bent. Three levels of preloading are considered: low, medium and high (which are related to the yield strain of the simulated material); Isotropic and Kinematic hardening rules are also considered. Additionally, an experimental evaluation is also presented by introducing a new supporting system to cut a slot in the beams. The results obtained in this work, provide a quantitative demonstration of the effect of hardening strain on the distribution of the residual stress in beams. In the same manner, the theoretical formulation of the CCM has been evaluated validating the application of this method for the determination of residual stress fields in mechanical components.

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Determination of Residual Stresses and the Resulting Stress Intensity Factors in the Ligament of Pre-Cracked Plates

Cited by 8 publications

References 4 publications

Fatigue crack propagation assessment based on residual stresses obtained through cut‐compliance technique

Fatigue crack propagation assessment based on residual stresses obtained through cut‐compliance technique

Experimental determination of stress intensity factors due to residual stresses

Residual Stresses in Beams (With and Without Prior History) Numerically Assessed by the Crack Compliance Method

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