Vibratory Stress Relief—An Investigation of the Underlying Processes

Walker, C.A.; Waddell, A.J.; Johnston, Daniel

doi:10.1243/pime_proc_1995_209_228_02

Cited by 59 publications

(44 citation statements)

References 9 publications

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“…Despite many years of research, there is still disagreement over the fundamental mechanism by which this acts to reduce stresses, or indeed whether it has any significant effect at all [98,99]. It has been proposed that VSR provides a driving force for dislocation movement at the intra-granular level [100], or even that it initiates a martensitic transformation in steels [101]. However currently the most widespread view is that under some conditions, VSR is able to cause local plastic deformation in the regions of material which, due to the presence of residual stress, are already close to their yield point.…”

Section: Vibratory Stress Reliefmentioning

confidence: 99%

Contemporary approaches to reducing weld induced residual stress

Coules

2013

Materials Science and Technology

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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. AbstractSelf-equilibrating residual stresses may occur in materials in the absence of external loading due to internal strain inhomogeneity. While favourable distributions of residual stress can bestow an object with the appearance of superior material properties, most welding processes leave behind residual stresses in particularly unfavourable patterns, causing a greater susceptibility to fracture-based failure mechanisms and unintended deformation. Currently, heat treatment is the primary means of removing these stresses, but since the formation of residual stress is dependent upon many material and process factors, there are several other viable mechanisms (using thermal, mechanical or phase transformation effects) by which it may be modified. It is only now, using relevant advances in numerical and experimental methods, that these techniques are being fully explored. This article gives a brief introduction to weld-induced residual stresses and reviews the current state-of-the-art with regard to their reduction. Emphasis is placed on the recent development of unconventional techniques, and the mechanisms by which they act.

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Section: Vibratory Stress Reliefmentioning

confidence: 99%

Contemporary approaches to reducing weld induced residual stress

Coules

2013

Materials Science and Technology

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“…Different from these studies, the application of VSR on the machined rings reverses the surface machining residual stresses from tension to compression and at the same time increases somewhat the subsurface compressive stresses along FD. On the cold rolled bar [5], Walker et al reversed the residual stress field from cold rolling, turning the surface layer into low …”

Section: Discussionmentioning

confidence: 99%

“…The vibratory frequency is increased to reach a resonant frequency. Relaxation of the residual stresses is attributed to a large peak stress, the sum of stress amplitude from vibration and local residual stress, that induces local plasticity [4][5][6]. The main advantages of VSR over TSR include higher process efficiency, lower energy consumption, no surface oxidation, feasibility for large components, etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of Vibration and Heat Treatment on Residual Stress of a Machined 12%Cr-Steel

Moverare

Avdovic³

et al. 2014

AMR

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In this paper we investigated the influence of vibratory stress relieving technique, which is widely used for stress relaxation of weld and casting components/structure, on machining residual stresses in a ring-component of 12%Cr-steel. It was shown that the employed vibratory treatment, without significantly altering the microstructure, turned the surface layer from tension into compression but retained the compressive residual stresses in the subsurface. In comparison, a stress relieving heat treatment, included as a reference in the study, removed completely the surface tensile residual stresses and reduced the subsurface compressive residual stresses to a low level. Significant microstructural changes in the form of recrystallization also occurred in a thin surface layer of the machining affected zone after the heat treatment.

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“…When the superposition of the dynamic stress and initial residual stress reaches the elastic limit of the material, plastic deformations occur in local positions, which leads to the residual stress release. Low cyclic stress amplitude can also release the stress after enough cycle times due to the generation of dislocation slip and multiplication at the micro level [21]. As a highly efficient and low-energy consumption method, VSR has received much attention from scholars and engineers in recent years.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Fatigue Life of Ti-6Al-4V Treated by Vibratory Stress Relief

Zhang

Song³

2017

Metals

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Vibratory stress relief (VSR) is a highly efficient and low-energy consumption method to relieve and homogenize residual stresses in materials. Thus, the effect of VSR on the fatigue life should be determined. Standard fatigue specimens are fabricated to investigate the fatigue life of Ti-6Al-4V titanium alloy treated by VSR. The dynamic stresses generated under different VSR amplitudes are measured, and then the relationship between the dynamic stress and vibration amplitude is obtained. Different specimen groups are subjected to VSRs with different amplitudes and annealing treatment with typical process parameters. Residual stresses are measured to evaluate the stress relieving effects. Finally, the fatigue behavior under different states is determined by uniaxial tension-compression fatigue experiments. Results show that VSR and annealing treatment have negative effects on the fatigue life of Ti-6Al-4V. The fatigue life is decreased with the increase in VSR amplitude. When the VSR amplitude is less than 0.1 mm, the decrease in fatigue limit is less than 2%. Compared with specimens without VSR or annealing treatment, the fatigue limit of the specimens treated by VSR with 0.2 mm amplitude and annealing treatment decreases by 10.60% and 8.52%, respectively. Although the stress relieving effect is better, high amplitude VSR will lead to the decrease of Ti-6Al-4V fatigue life due to the defects generated during vibration. Low amplitude VSR can effectively relieve the stress with little decrease in fatigue life.

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Vibratory Stress Relief—An Investigation of the Underlying Processes

Cited by 59 publications

References 9 publications

Contemporary approaches to reducing weld induced residual stress

Contemporary approaches to reducing weld induced residual stress

Influence of Vibration and Heat Treatment on Residual Stress of a Machined 12%Cr-Steel

Experimental Investigation on the Fatigue Life of Ti-6Al-4V Treated by Vibratory Stress Relief

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