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2020 №03 (02) DOI of Article
10.37434/tdnk2020.03.03
2020 №03 (04)

Technical Diagnostics and Non-Destructive Testing 2020 #03
Technical Diagnostics and Non-Destructive Testing #3, 2020, pp. 23-29

Fracture resistance and damageability of linear-elastic ceramics under the conditions of edge local loading: a statistical analysis

V.V. Khvorostianyi, Y.M. Rodichev, O.B. Soroka
G.S. Pisarenko Institute for Problems of Strength of NAS of Ukraine. 2 Timiryazevska Str, 01014, Kiyv, Ukraine. E-mail: khvorostianyi.v.v@ipp.kiev.ua

A statistical analysis of experimental data of linear-elastic single-phase ceramics, tested under local loading by scratching of specimen surface up to the edge chipping by the Rockwell indenter, was performed. Experimental dependences of Weibull distribution for the parameters of damageability and fracture resistance of the edge were constructed and monomodal approximations were applied. The diagrams of fracture of ceramic materials are obtained taking into account the data of statistical analysis, which refect the patterns of change in the value of the edge damageability parameter at diferent values of fracture probability. A comparison of experimental and calculated statistical results was given. It is concluded that the combination of empirical and analytical data on the damageability of the edges and their resistance to fracture under the indicated test conditions makes it possible to obtain reasonable values of the corresponding parameters, which are necessary for further reliable prediction of the performance of ceramics. The proposed approach significantly increases the accuracy of estimation of the used parameters of mechanical behavior of brittle materials and contributes to rational selection of optimal operating conditions for them. 20 Ref, 2 Tabl. 2, 5 Fig.
Keywords: ceramics, scratching up to edge chipping, damageability and fracture resistance parameters, diagrams of fracture, Weibull distribution, statistical estimation and prediction

Received: 06.08.2020

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