On the estimation of the toughness of surface microcracks

Berka, L.; Murafa, Nataliya

doi:10.1023/b:frac.0000040973.14787.82

Cited by 3 publications

(1 citation statement)

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“…The hardness quantity derived on this basis is always conventional. The surface properties can be classified exactly by a combination of the indent method and external loading, which is chosen in such a way as to cause a state of homogeneous stress on the specimen surface, which is superposed with the stress state caused by the indent [3]. This technique was verified by estimation of material surface resistance to cracking initiated by an indent.…”

Section: Introductionmentioning

confidence: 99%

On a Testing of Mechanical Properties of Material Surfaces

Berka

Murafa²

2005

MSF

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Hardness testing is a method frequently used for evaluating the resistance of body surfaces to the influence of contact loading. The Vickers hardness test is applied for this purpose in a case when the material is sufficiently ductile and no cracks occur in the corners of the indents. Testing of the surface hardness of such materials as glass and ceramics on the basis of the Vickers testing method must take into account the energy that is spent on crack spreading. This paper describes a more exact and accurate method for evaluating resistance to microcrack formation on the surface of a material. To evaluate the conditions for crack spreading, it is necessary to test a specimen under loading in bulk. The suggested procedure involves a bent strip. As bending stresses are known, from them and from the differences in crack length along and across the strip, the resistance of the material surface to crack propagation is determined.

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Section: Introductionmentioning

confidence: 99%