Application of fiber optic sensors to fracture mechanics problems

Narendran, Nadarajah; Shukla, Arun; Letcher, S. V.

doi:10.1016/0013-7944(91)90098-l

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…Numerous experimental reports have been devoted to measuring crack driving forces under monotonic or cyclic loading. The techniques can be broadly classified as optical methods, such as photoelasticity [1] and moiré interferometry [2], surface-based microscopy methods, such as in-situ stereoimaging with scanning electron microscopes [3], and a few limited methods such as direct strain measurement using embedded optical fiber strain sensors [4]. Some of the above techniques yield information that is essentially averaged across the through-thickness direction of a specimen, whilst many of the others reflect surface-specific two-dimensional deformation behavior.…”

Section: Introductionmentioning

confidence: 99%

Direct measurement procedure for three-dimensional local crack driving force using synchrotron X-ray microtomography

et al. 2008

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X-ray microtomography has been utilized for the observation of ductile fractures in an aluminum alloy with an Al/Al-Si dual phase structure. A procedure for analyzing a series of tomographic images is proposed for extracting the variation in the local crack-tip opening displacement (CTOD), and its feasibility is confirmed. Complicated crack growth behavior and the formation of uncracked ligaments ahead of a crack tip are observed in the alloy owing to the marked difference in local fracture toughness between the two phases. The proposed technique has provided a quantitative interpretation for such phenomena. It is clarified that a conventional measurement significantly overestimates the CTOD level. The transition behavior in CTOD has been revealed over a certain distance across an interface between the two phases, suggesting the existence of scaling effects that influence the microstructure/fracture relationship. Overall the current method could offer a highly effective way of assessing 3-D local fracture behavior.

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Section: Introductionmentioning

confidence: 99%

Direct measurement procedure for three-dimensional local crack driving force using synchrotron X-ray microtomography

et al. 2008

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“…(b) Surface-based microscopy, such as scanning probe microscopy [21] and in situ stereoimaging in scanning electron microscopes [22]. Furthermore, direct strain measurement from embedded optical fibre strain sensors has recently been reported [23]. Some of the above techniques yield information that is essentially averaged across the through-thickness direction of a specimen [13,18], whilst many of the others reflect surface-specific 2D deformation behaviour.…”

Section: Introductionmentioning

confidence: 99%

“…Some of the above techniques yield information that is essentially averaged across the through-thickness direction of a specimen [13,18], whilst many of the others reflect surface-specific 2D deformation behaviour. Several techniques enable the assessment of local crack driving forces within a material bulk, specifically, the embedded-multiple-grid moir e method [16], frozen stress photoelasticity [24], Isodyne technique [25], scattered light speckle photography technique [26] and optical fibre strain sensing [23]. Significant limitations exist however, with the embedded-multiple-grid moir e method only providing interior strains at several points with low sensitivity, whilst frozen stress photoelasticity, the isodyne and scattered light speckle photography techniques are limited to transparent materials and/or birefringent materials.…”

Section: Introductionmentioning

confidence: 99%

A 3D measurement procedure for internal local crack driving forces via synchrotron X-ray microtomography

Toda¹

2004

Acta Materialia

182

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Synchrotron X-ray microtomography has been utilized for the in situ observation of fatigue crack opening/closure during load cycles. High-resolution phase contrast imaging technique has enabled the reconstruction of clear crack images together with the details of microstructural features. Physical displacements of micro-pores in a crack-tip stress field are used to obtain local mixed-mode crack driving forces along a crack front, and its feasibility is confirmed. Complicated crack closure behaviour are observed due to the combined effects of local modes II and III displacements. The technique used provides a highly effective way of assessing local crack driving forces together with supplementary ways of verifying and interpreting it by visualising and quantifying various forms of crack-tip shielding behaviour. The proposed technique is clearly advantageous compared to the limited procedures available in the current literature, where detailed internal information can only be achieved for limited types of material.

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Determination of stress intensity factors and crack-opening stresses from jumps in crack-edge displacements

Maksimenko

1994

J Appl Mech Tech Phys

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Application of fiber optic sensors to fracture mechanics problems

Cited by 10 publications

References 13 publications

Direct measurement procedure for three-dimensional local crack driving force using synchrotron X-ray microtomography

Direct measurement procedure for three-dimensional local crack driving force using synchrotron X-ray microtomography

A 3D measurement procedure for internal local crack driving forces via synchrotron X-ray microtomography

Determination of stress intensity factors and crack-opening stresses from jumps in crack-edge displacements

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