Determination of mode 1 notch stress intensity factor by the photoelastic technique

Murthy, N. S.; Rao, P. Raghavendra

doi:10.1016/s0013-7944(85)80048-5

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2001

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“…See Hart [31], Ioakimidis and Theocaris [32], Bangji et al [33], and Strandberg [34] for examples. Photoelastic methods can be used to obtain notch stress intensity factors, as demonstrated by Murthy and Rao [35]. These authors measured values for Q I with a relative error of 7 · 10 −2 for a single edge notched specimen with relative notch depth a/w = 0.15 and a height to width ratio of h/w = 5.…”

Section: Other Methodsmentioning

confidence: 99%

On the computation of stress fields on polygonal domains with V‐notches

Helsing

Jönsson

2001

Numerical Meth Engineering

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The interior stress problem is solved numerically for a single edge notched specimen under uniaxial load. The algorithm is based on a modification of a Fredholm second kind integral equation with compact operators due to Muskhelishvili. Several singular basis functions for each of the seven corners in the geometry enable high uniform resolution of the stress field with a modest number of discretization points. As a consequence, notch stress intensity factors can be computed directly from the solution. This is an improvement over other procedures where the stress field is not resolved in the corners and where notch stress intensity factors are computed in a roundabout way via a pathindependent integral. Numerical examples illustrate the superior stability and economy of the new scheme.

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