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Razušenie materialov pri dinamičeskom kontaknom nagruženii

Bogdanovič P., Tkačuk D., Bliznec D.

Acta Mechanica et Automatica

2007

Vol. 1, no. 1

15-18

The paper reports data on the kinetics, failure mechanism, and wear rate of silicate glass and sapphire in high-speed abrasive machining. Regularities of the effect of the load the velocity of abrasive particle movement, and the duration of the cutting of sapphire and the diamond monocrystal on temperature fields in the cutting zone and adjacent areas are discussed. I is shown that at high velocities me maximal surface temperature position shifts outside the contact site and temperature stresses cause the thermal cracking of sapphire and glass in this zone. When cutting a diamond monocrystal the temperature in the cutting zone can reach values sufficient for its local graphitization to occur.

Studies of failure of high-strength concrete

Hola J.

Engineering Transactions

1998

Vol. 46, iss.3/4

333-351

This paper presents results of studies, conducted by means of the acoustic emission techni-que and strain measurements, of the failure of high-quality concrete. Several concretes differing in their composition and compression strength were tested. It has been determined that the failure of high-strength concrete can be regarded as a three-stage process. The values of the stresses initiating the stable development of microcracks and those of the critical stresses after which the unstable development and propagation of microcracks begin were determined. It has been established that the values of these stresses for the tested concretes depend on compression strength and they increase with this strength. The obtained results are of significance to both the theory and practice.