Experimental measurement and finite element simulation of the interaction between residual stresses and mechanical loading

Smith, David J.; Farrahi, G.H.; Zhu, Wenbo; McMahon, Chris

doi:10.1016/s0142-1123(00)00104-3

Cited by 65 publications

(31 citation statements)

References 6 publications

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“…For this reason, it's important to use numerical approach based on the FE method. Indeed, the proposed FE models [20,21,25,[31][32][33][34] have the advantage to simulate the cyclic hardening behaviour of the surface layers which represents the main phenomenon of residual stress relaxation. However, the implementation of these models presents the difficulty to identify the cyclic hardening law and the calibration of its material constants [20,32].…”

Section: Introductionmentioning

confidence: 99%

“…Smith et al [32] have analyzed, using FE simulations, the interaction between residual stresses and cyclic mechanical loading in the case of forged and shot-blasted bars of En 15R. The initial residual stress distribution and the initial state of the material model are introduced in the FE model.…”

Section: Introductionmentioning

confidence: 99%

“…The hardening of each layer of 10 lm was taken into account following the method proposed in Ref. [32] to ensure steady-state of initial residual stresses.…”

Section: Introduction Of Initial Surface Propertiesmentioning

confidence: 99%

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Evaluation of residual stress relaxation and its effect on fatigue strength of AISI 316L stainless steel ground surfaces: Experimental and numerical approaches

Laamouri

Sidhom

Braham

2013

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This paper is aimed at evaluating the residual stress relaxation and its effect on the fatigue strength of AISI 316L steel ground surfaces in comparison to electro-polished surfaces. An experimental evaluation was performed using 3-point and 4-point bending fatigue tests at R r = 0.1 on two sets of notched specimens finished by electro-polishing and grinding. The residual stress fields were measured at the notch root of specimens, before and after fatigue tests, by means of the X-ray diffraction technique. It was found a degradation of about À35% for the 4-point bending fatigue limit at 2 Â 10 6 cycles of the ground specimens in comparison to the electro-polished ones. This degradation is associated with a slight relaxation of the grinding residual stresses which remain significant tensile stresses at the stabilized state. While under the 3-point bending test, these residual stresses relax completely and provoke a noticeable increase of the fatigue limit estimated at about 50% in comparison to the 4-point bending fatigue test. The numerical evaluation of residual stress relaxation was carried out by FE analyses of the cyclic hardening behaviour of the ground layer. The isotropic and nonlinear kinematic model proposed by Chaboche was used and calibrated for the base material and the ground layer. The results show that residual stresses relax to a stabilized state characterized by elastic-shakedown response. This stabilization is occurred after the first cycle of the 4-point bending test corresponding to the higher stress concentration (K t4p = 1.66), while it requires many cycles under the 3-point bending test corresponding to the lower stress concentration (K t-3p = 1.54). The incorporation of stabilized residual stress values into the Dang Van's criterion has permitted to predict with an acceptable accuracy the fatigue limits under both bending modes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of residual stress relaxation and its effect on fatigue strength of AISI 316L stainless steel ground surfaces: Experimental and numerical approaches

Laamouri

Sidhom

Braham

2013

International Journal of Fatigue

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“…This means that laboratory x-ray diffraction data is not useful, while incremental hole drilling is unreliable and semi-destructive, and hence shifts crack initiation to the hole under subsequent fatigue cycling. Numerical models of shot peened components have been attempted but show poor correspondence between their results and those obtained from x-ray and hole drilling data [9]. The authors (with colleagues for Sheffield University -J. R. Yates and D. Asquith) recently performed a systematic synchrotron diffraction investigation of residual stresses in shot peened 7050-T7451 alloy using specimens made with several machining sequences and two shot peening coverage values.…”

Section: Introductionmentioning

confidence: 99%

Residual stresses and fatigue performance

James

Hughes²,

Chen³

et al. 2007

Engineering Failure Analysis

172

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Residual stresses are an inescapable consequence of manufacturing and fabrication processes, with magnitudes that are often a high proportion of the yield or proof strength. Despite this, their incorporation into life prediction is primarily handled through sweeping assumptions or conservative application of statistics. This can lead to highly conservative fatigue design methodologies or unforeseen failures under dynamic loading. The push from the desire for higher levels of materials performance, coupled with the pull of more sophisticated techniques for residual stress measurement, favours a reassessment of the accuracy of assumptions made about residual stresses and the modification during fatigue cycling. A viewpoint is also emerging that the fatigue performance of welded joints might be optimised through careful process control, coupled with understanding of the relative positions of, and interaction between, residual stress peaks, weld defects, hardness and microstructure. This paper will present information regarding the residual stress profiles in aluminium and steel welds obtained via synchrotron and neutron diffraction at the ESRF/ILL in Grenoble. Specimens were then subjected to specific cases of fatigue loading and the residual stress field was again measured. Difficulties associated with determining the strain-free lattice spacing will be mentioned, and the import of these data for life prediction modelling will be considered.

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“…X-ray diffraction is used to detect changes in the surface residual stress of materials subject to temperatures where glide type creep mechanisms can occur, and as such is used to monitor the progress of mechanically induced residual stress relaxation although this technique is not always infallible. [14,15] Experimental.…”

Section: Introductionmentioning

confidence: 99%

The Magnitude of Heat Treatment Induced Residual Stresses and the Thermal Stress Relief of Aluminium Alloys

Robinson

Tanner

2002

MSF

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Abstract. To produce useful strengthening, precipitation hardenable aluminium alloys rely on rapid quenching from the solution heat treatment temperature to suppress the formation of coarse equilibrium second phases. An unavoidable consequence of the rapid quenching of thick sections is the severe thermal gradients that quickly develop in the material. The attendant inhomogeneous plastic flow can then result in the establishment of residual stresses. Established procedures exist to minimise residual stress by quenching into boiling water or organic quenchants at the expense of ageing response. Residual stresses can also be relieved after solution heat treatment by the application of plastic deformation in a controlled manner. A limited degree of thermal stress relief is also reported to occur during subsequent artificial ageing treatments, especially duplex ageing treatments. It is generally accepted that the size of the residual stresses induced during quenching cannot exceed the yield strength of the material. However, for precipitation hardened aluminium alloys, stress magnitudes as measured by standard techniques can exceed the uniaxial stress required to cause plastic flow during tensile tests conducted immediately after quenching. An investigation to explain these observations involving measuring as-quenched tensile properties and room temperature stress relief in heat treatable and non-heat treatable aluminium alloys has been conducted. Two alloys were investigated: 7010, an Al-Zn-Mg-Cu precipitation hardenable alloy and 5251, a non-heat treatable medium strength Al-Mg-Mn alloy. Tensile properties were determined by heat-treating test specimens at 475°C, cold water quenching and then testing without delay to avoid significant microstructural modification. The progress of stress relief at room temperature was then monitored utilising test coupons and standard x-ray diffraction techniques. Natural ageing of 7010 leads to a rapid increase in strength and a subsequent locking in of residual stresses (this cannot occur in 5251) and the change in residual stress is monitored as a function of time. An attempt has also been made to determine the efficacy of x-ray diffraction to monitor thermally induced stress relief. X-ray diffraction and hole drilling techniques to ASTM E837 were utilised to follow the progress of isothermal stress relief at room temperature and 200°C in both 7010 and 5251.Introduction.

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Experimental measurement and finite element simulation of the interaction between residual stresses and mechanical loading

Cited by 65 publications

References 6 publications

Evaluation of residual stress relaxation and its effect on fatigue strength of AISI 316L stainless steel ground surfaces: Experimental and numerical approaches

Evaluation of residual stress relaxation and its effect on fatigue strength of AISI 316L stainless steel ground surfaces: Experimental and numerical approaches

Residual stresses and fatigue performance

The Magnitude of Heat Treatment Induced Residual Stresses and the Thermal Stress Relief of Aluminium Alloys

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