IN A CERAMIC SURFACE LAYER
UNDER ACTION OF AN EXTERNAL LOAD.
PART 3. EFFECT OF A DISTRIBUTED FORCE LOAD
V. V. Kuzin,
S. N. Grigor’ev,
and V. N. Ermolin
Translated from Novye Ogneupory, No. 1, pp. 42 – 46, January 2014.
Original article submitted October 24, 2013.
Results are provided for a comprehensive study of stress inhomogeneity in a ceramic surface layer. The
stress-strained state of a ceramic surface layer based on zirconium dioxide under the action of a complex me-
chanical load is studied. High stress inhomogeneity is revealed in ceramic structural elements. A requirement
is noted for considering stress inhomogeneity in describing a wear and failure mechanism, and also in design-
ing objects of this ceramic for prescribed operating conditions.
Keywords: ceramic, inhomogeneity, stress-strained state, surface layer, modelling, zirconium dioxide, design.
Physicochemical processes occurring in surface layers of
structurally inhomogeneous materials attract special atten-
tion of researchers [1, 2]. This interest is connected both with
fundamental science and with numerous engineering and
technical applications. Mainly results of these studies are im-
portant for solid physics in understanding the behavior of
complex systems consisting of a considerable number inter-
acting elements, each of which is characterized by a unique
combination of properties . Expansion and deepening of
this knowledge will make it possible to create ceramic mate-
rial with special service properties and to predict the life of
objects made from these materials during operation . A list
of other examples of applied significance for this research
can easily be continued [5 – 8].
A study of grain boundary conditions in a ceramic sur-
face layer is of priority importance since they are a unique
independent phase, having nano- and microparameters. Their
special structure and numerous physicochemical processes
occurring in very localized areas of material under action of
an external load, markedly affect ceramic properties and be-
havior. In particular, an extremely unfavorable consequence
of forming high local stresses at grain boundaries is genera-
tion of operational defects, whose accumulation leads to ce-
ramic surface microfailure [9, 10].
In order to reduce the role of this unfavorable connection
it is necessary to know features of the effect of different ex-
ternal loads on the stress-strained state of a ceramic surface
layer. The effect of a complex mechanical and thermal load
on stress inhomogeneity in a zirconium dioxide ceramic sur-
face layer has been provided in publications [11 – 13]. The
aim of this work is to estimate stress inhomogeneity in a zir-
conium dioxide ceramic surface under action of a distributed
force load. The effect of a combined thermal and force load
has also been studied; results of these studies will be pro-
vided in a future article.
Solution of the stated problem is based on numerical
modeling of deformation processes using a model complex
[14, 15]. The procedure in performing these experiments has
been described in detail in part 1 of this work . Therefore
only the most important assumptions of the procedure are
The design layout is presented in the form of a structure
consisting of fragments of components D1 and D2 made of
ceramic and copper respectively (Fig. 1). A fragment of com
Refractories and Industrial Ceramics Vol. 55, No. 1, May, 2014
1083-4877/14/05501-0036 © 2014 Springer Science+Business Media New York
Parts 1 and 2 of the article were published in Novye Ogneupory
Nos. 10 and 12 for 2013.
FGBOU VPO Moscow State Technological University Stankin,