Mapping and load response of overload strain fields: Synchrotron X-ray measurements

Croft, Mark; Shukla, V.; Jisrawi, N.; Zhong, Z.; Sadangi, Rajendra; Holtz, R.L.; Pao, P.S.; Horváth, Klaudia; Sadananda, K.; Ignatov, Alexander

doi:10.1016/j.ijfatigue.2009.01.020

Cited by 37 publications

(26 citation statements)

References 11 publications

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“…Although this capability exists in neutron diffraction facilities and some high energy synchrotron user facilities, no such capability exists for bench-top laboratory conditions [1][2][3][4][5]. Under Air Force funding, a new method was developed to measure strain depth profiles of shot peened surface treatments using standard NDE laboratory equipment [6].…”

Section: Introductionmentioning

confidence: 99%

Volumetric measurement of residual stress using high energy x-ray diffraction

Whitesell¹,

McKenna²,

Wendt³

et al. 2016

AIP Conference Proceedings

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Section: Introductionmentioning

confidence: 99%

Volumetric measurement of residual stress using high energy x-ray diffraction

Whitesell¹,

McKenna²,

Wendt³

et al. 2016

AIP Conference Proceedings

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“…Two different families of techniques have been used, namely, synchrotron X-ray diffraction and displacement field measurement either by Digital Image Correlation (DIC) or tracking of individual markers. Synchrotron X-ray diffraction studies allow mapping the crack tip strain field [4][5][6][7]. This method is mainly applied to unloaded samples and it focuses on measurement of the residual strains in the wake and at the tip of a post overload fatigue crack with a rather coarse spatial resolution along the crack front where the strain is averaged through the sample thickness for 1-mm thick samples where plane stress should prevail [7] or sampled every 300 µm to understand the stronger crack retardation observed near the specimen edges [5].…”

Section: Introductionmentioning

confidence: 99%

“…Such diffraction studies bring valuable insight into the overload effect. For example, the post-overload residual strain was shown to persist after crack propagation with the overload response being "turned off" when loading above a critical load value [5]. However, no attempt was made to convert the measured strain maps into Stress Intensity Factors (SIFs) as has already been done in DIC studies.…”

Section: Introductionmentioning

confidence: 99%

Influence of closure on the 3D propagation of fatigue cracks in a nodular cast iron investigated by X-ray tomography and 3D volume correlation

et al. 2010

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Synchrotron X-ray tomography was performed during in-situ fatigue crack propagation in two small size specimens made of nodular graphite cast iron. While direct image analysis allows to retrieve the successive positions of the crack front, and to detect local crack retardation, volume correlation enables for the measurement of displacement fields in the bulk of the specimen. The Stress Intensity Factors (SIF) which are extracted from the measured displacement fields and the corresponding local crack growth rate all along the front are in good agreement with published results. In particular, it is possible to link the non propagation

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“…Third generation synchrotron X-ray facilities allow experimental measurement of the strain at the interior of the specimen. Recent works have shown that it is possible to map in 2D the strain fields around the cracktip [3][4][5]. However, our highest spatial resolution measurements (25m) were made on a very fine grained Al-Li alloy, with low fracture toughness such that the plastic zone was very small.…”

Section: Introductionmentioning

confidence: 99%

Study of overload effects in bainitic steel by synchrotron X-ray diffraction

López-Crespo¹,

Withers²,

Yates³

et al. 2013

Frattura Ed Integrità Strutturale

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This work presents an in-situ characterisation of crack-tip strain fields following an overload by means of synchrotron X-ray diffraction. The study is made on very fine grained bainitic steel, thus allowing a very high resolution so that small changes occurring around the crack-tip were captured along the crack plane at the mid-thickness of the specimen. We have followed the crack as it grew through the overload location. Once the crack-tip has progressed past the overload event there is strong evidence that the crack faces contact in the region of the overload event (though not in the immediate vicinity of the current locations of the crack tip) at K min even when the crack has travelled 1mm beyond the overload location. It was also found that at K max the peak tensile strain ahead of the crack-tip decreases soon after the overload is applied and then gradually recovers as the crack grows past the compressive region created by the overload.

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Mapping and load response of overload strain fields: Synchrotron X-ray measurements

Cited by 37 publications

References 11 publications

Volumetric measurement of residual stress using high energy x-ray diffraction

Volumetric measurement of residual stress using high energy x-ray diffraction

Influence of closure on the 3D propagation of fatigue cracks in a nodular cast iron investigated by X-ray tomography and 3D volume correlation

Study of overload effects in bainitic steel by synchrotron X-ray diffraction

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