A strain gage technique for the determination of mixed mode stress intensity factors of orthotropic materials

Chakraborty, Debabrata; Murthy, K.S.R.K.

doi:10.1016/j.compstruct.2016.10.044

Cited by 21 publications

(6 citation statements)

References 33 publications

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“…• Strain gauge technique: Strain gauge(s) glued to the surface of the studied test sample can measure the strain occurred at certain point(s) near the crack tip. By correlation with the anisotropic strain series solution, crack tip parameter(s) can be obtained accordingly (Shukla et al, 1989;Chakraborty et al, 2017a).…”

Section: Experimental Approachesmentioning

confidence: 99%

Crack tip fields in anisotropic planes: a review

2021

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This paper reviews crack tip asymptotic fields in generic plane anisotropic media, rigorously categorising about 400 studies devoted to the determination of the asymptote coefficients, also referred to as crack tip parameters. These studies cover a broad spectrum of methodologies focused on determining crack tip parameters in anisotropic materials, from analytical, numerical and experimental perspectives, conducted over the last six decades. Brief descriptions are given for a selected number of approaches to shed light on their general concepts and their methodology to characterise crack tip parameters. Lastly, the influence of higher order coefficients in the crack tip stress field is demonstrated by a representative example from the literature.

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Section: Experimental Approachesmentioning

confidence: 99%

Crack tip fields in anisotropic planes: a review

2021

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“…Using these strain values, K I has been calculated using Eq. (41). Similarly, in the case of the two-gage technique proposed by DS, K I has been calculated from the ε x ′ x ′ strain values at the nodes along the gage line θ = 65.16 • using Eq.…”

Section: Both Cases Of Two Rectangular Rosettes and Two Gagesmentioning

confidence: 99%

“…The same authors [38] also proposed a methodology for obtaining the valid radial locations of the strain gages in order to accurately determine the mixed-mode SIFs. Debaleena Chakraborty et al [39][40][41] and Pranjol Paul et al [42] have extended the methodologies proposed by these authors for orthotropic composite materials and for isotropic body containing a sharp V-notch, respectively. Next, experiments conducted by Sarangi et al [27,43], Debaleena Chakraborty et al [44] and Pranjol Paul et al [34] have shown the effectiveness of these theoretical methodologies and the usefulness of the optimal strain gage locations in accurate measurement of SIFs.…”

Section: Introductionmentioning

confidence: 99%

Optimal location of the two-element rectangular rosette to evaluate the stress intensity factor KI

Mejni

Nianga

Imad

2020

Theoretical and Applied Fracture Mechanics

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“…The stress intensity factor (SIF) K, which characterises the stress field strength near the crack tip, can be used to estimate whether the crack will become unstable [1]. There are many ways to measure the SIF experimentally, such as strain-based techniques [2,3] and photoelastic methods [4]. However, the photoelastic method is usually applicable only to transparent materials.…”

Section: Introductionmentioning

confidence: 99%

Optimisation Method for Determination of Crack Tip Position Based on Gauss-Newton Iterative Technique

Yang

Wei

Liang

et al. 2021

Chin. J. Mech. Eng.

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In the digital image correlation research of fatigue crack growth rate, the accuracy of the crack tip position determines the accuracy of the calculation of the stress intensity factor, thereby affecting the life prediction. This paper proposes a Gauss-Newton iteration method for solving the crack tip position. The conventional linear fitting method provides an iterative initial solution for this method, and the preconditioned conjugate gradient method is used to solve the ill-conditioned matrix. A noise-added artificial displacement field is used to verify the feasibility of the method, which shows that all parameters can be solved with satisfactory results. The actual stress intensity factor solution case shows that the stress intensity factor value obtained by the method in this paper is very close to the finite element result, and the relative error between the two is only − 0.621%; The Williams coefficient obtained by this method can also better define the contour of the plastic zone at the crack tip, and the maximum relative error with the test plastic zone area is − 11.29%. The relative error between the contour of the plastic zone defined by the conventional method and the area of the experimental plastic zone reached a maximum of 26.05%. The crack tip coordinates, stress intensity factors, and plastic zone contour changes in the loading and unloading phases are explored. The results show that the crack tip change during the loading process is faster than the change during the unloading process; the stress intensity factor during the unloading process under the same load condition is larger than that during the loading process; under the same load, the theoretical plastic zone during the unloading process is higher than that during the loading process.

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A strain gage technique for the determination of mixed mode stress intensity factors of orthotropic materials

Cited by 21 publications

References 33 publications

Crack tip fields in anisotropic planes: a review

Crack tip fields in anisotropic planes: a review

Optimal location of the two-element rectangular rosette to evaluate the stress intensity factor KI

Optimisation Method for Determination of Crack Tip Position Based on Gauss-Newton Iterative Technique

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