Photothermal determination of vertical crack lengths in silicon nitride

Rantala, Jukka; Hartikainen, J.; Jaarinen, J.

doi:10.1007/bf00324569

Cited by 31 publications

(11 citation statements)

References 8 publications

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“…Perhaps the best known means is the method called optical beam deflection or the "mirage" technique. With the mirage technique very thin cracks can be detected [1], but the method is very slow. Another technique that has shown considerable success in crack detection is the so-called "flying spot" method.…”

Section: Introductionmentioning

confidence: 99%

Observations on Image Formation in the Line Scanning Thermal Imaging Method

Varis

Oksanen

Rantala

et al. 1995

Review of Progress in Quantitative Nondestructive Evaluation

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Section: Introductionmentioning

confidence: 99%

Observations on Image Formation in the Line Scanning Thermal Imaging Method

Varis

Oksanen

Rantala

et al. 1995

Review of Progress in Quantitative Nondestructive Evaluation

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“…Previous mirage experiments found that mirage indicated radial crack length was at least 90 pm longer than the optically observed radial crack length [8]. However, compressive residual stresses in prepared surfaces of M,N, down to about 20 pm are known [4] and could easily account for some surface closure of radial cracks.…”

Section: Discussionmentioning

confidence: 99%

Photoacoustic microscopy of indentation lateral cracks

Rose¹,

Bryk²,

Arutunian³

et al. 1994

J. Phys. IV France

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Abstract:Understanding the fracture process in advanced ceramics is of obvious use for improving their strength, toughness and ultimately performance. The lateral cracking process is related to wear in particular. Photoacoustic microscopy is used here to view lateral cracks produced in a controlled manner by Vicker's indentations in hot pressed silicon nitride (NC 132, Norton Co.). Eventually, a figure of merit related to bearing performance may emerge.

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“…The computational method used for evaluating the heat diffusion equation follows the CranckNicolson finite difference scheme and it has been described on several earlier works also [5][6][7]. A delamination (14 rom x 22 mm) characterized by a thermal contact resistance, Rc, was placed either between the first and the second or the second and the third layer (Fig.…”

Section: Methodsmentioning

confidence: 99%