Overview of ASTM Symposium on Analytical and Experimental Methods for Residual Stress Effects in Fatigue

Champoux, Robert; Underwood, J. H.; Kapp, J. A.

doi:10.21236/ada205622

Cited by 5 publications

(6 citation statements)

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“…However, flash-butt welds produced using both stationary (fixed) and mobile welding machines present high tensile residual stress, especially in the web region of the weld. Residual stresses can have a significant influence on the fatigue lives of engineering components [3]. In particular, tensile residual stresses near surface tend to accelerate the initiation and growth phases of the fatigue process while compressive residual stresses close to the surface may prolong fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Reaserch on Measurement of Residual Stresses in Flash-Butt-Weld Rails Using X-Ray Diffraction

Shao

Chen

Gou

et al. 2011

AMR

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The residual stress,which is unavoidable in the process of flash-butt-weld rails,plays important roles in the service life of the railway rails.However,knowledge of magnitude,direction,and sign of the residual stress is useful for maintenance and failure prevention.In this paper,we measured the residual stresses in the flash-butt weld of the U71Mn railway rail,using X-ray diffraction method.Besides,we investigated the influence of grinding on residual surface stress.This investigation showed that residual stress generated by grinding could be removed by electro-polishing,we also found that there was longitudinal compressive stress in the foot and head region,while the web region presented tensile stress,and in the transverse position,all of the three regions existed both compressive and tensile stress.

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Section: Introductionmentioning

confidence: 99%

Reaserch on Measurement of Residual Stresses in Flash-Butt-Weld Rails Using X-Ray Diffraction

Shao

Chen

Gou

et al. 2011

AMR

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“…They concluded that fatigue lives were below the predictions if residual stress relaxation was not taken into consideration. The understanding and accurately quantifying residual stress relaxation and redistribution under cyclic mechanical load still remain as a technical challenge for the researchers [7] .…”

Section: Introductionmentioning

confidence: 99%

Relaxation of Residual Stress Part 2: Relaxation of Stage 2

Zaroog¹,

Ali²,

Sahari³

et al. 2009

American J. of Engineering and Applied Sciences

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Problem statement: Compressive residual stress induced by surface treatment such as shot peening increased components fatigue life. However the initial induced residual stresses relax during component operating life and it is important to consider the relaxation in the design. Approach: In this study, a 2024-T351 aluminum alloy specimens were shot peened into three shot peening intensities condition to induce compressive residual stresses. Then fatigue test for two loads was performed for the 10, 1000 and 10000 cyclic loads. The initial residual stresses at the initial condition and after 10, 1000 and 10000 cycle of fatigue loading were measured using X-ray diffraction method. Results: The results showed that the relaxation of the residual stress for the load 15.5 kN is less than the relaxation of the load 30 kN for the three shot peening intensity. The maximum relaxation for load 15.5 kN is 46% of the initial residual stress at 10000 cycles for intensity 0.009 A while the maximum relaxation for load 30 kN is 54% at 10000 cycles for the intensity of 0.0054% A. this result indicated that the residual stress relaxation depended on the load amplitude. Conclusion: The initial residual stress did not remain stable during the components fatigue life. Within the second phase relaxation, micro-plastic strains accumulating from cycle to cycle. The residual stress relaxation for second phase is in logarithmic relationship

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“…With respect to a fatigue crack growth concept with a proper superposition of the residual and load stress state, the reader is referred to a recent paper by Beghini et al [ 11. Such a compressive residual stress state-uR, aR>O, lowers the middle value of a stress cycle AaL to -aR + A 4 2 and, therefore, slows down the growth of a crack. For reference, specifically with respect to shot-peening, see Champoux et al [2]; with respect to surface rolling and grinding, see Xu et al [3], and with respect to nitriding see e.g. Tietz et al [4] and Spies [ 5 ] .…”

Section: Introductionmentioning

confidence: 99%

“…[2,4,5], that fatigue occurs due to the growth of flaws embedded near the surface of a specimen. Here a flaw with an elliptical contour (semiaxis a, b) is assumed.…”

Section: Introductionmentioning

confidence: 99%

Elliptical Subsurface Cracks Under a Normal Stress and a Residual Stress Field

Fischer

Mayrhofer

Parteder

1996

Fatigue Fract Eng Mat Struct

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Abstnx-Tbe distribution of residual stresses due to surface treatments, such as nitriding, induction hardening or shot-peening, is explained in the introduction. The stress intensity factor distribution along an elliptical plane crack near the surface in such a residual field is presented. Existing methods including the weight function method do not allow one to find this distribution directly. Therefore, a finite element study was undertaken showing the complex character of the stress intensity factor distribution. Additionally, the calculation of the stress intensity factor distribution around the crack front for an external tension or bending load stress is explained. In these cases some simplified semi-analytical expressions can be found.

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Overview of ASTM Symposium on Analytical and Experimental Methods for Residual Stress Effects in Fatigue

Cited by 5 publications

References 0 publications

Reaserch on Measurement of Residual Stresses in Flash-Butt-Weld Rails Using X-Ray Diffraction

Reaserch on Measurement of Residual Stresses in Flash-Butt-Weld Rails Using X-Ray Diffraction

Relaxation of Residual Stress Part 2: Relaxation of Stage 2

Elliptical Subsurface Cracks Under a Normal Stress and a Residual Stress Field

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