IN A CERAMIC SURFACE LAYER
UNDER ACTION OF AN EXTERNAL LOAD.
PART 4. COMBINED EFFECT OF FORCE AND THERMAL LOADS
V. V. Kuzin,
S. N. Grigor’ev,
and V. N. Ermolin
Translated from Novye Ogneupory, No. 2, pp. 29 – 34, February 2014.
Original article submitted November 18, 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.
An effective method for studying formation and structure
of structurally-inhomogeneous materials is computer model-
ing [1, 2]. The possibility of versatile analysis of deformation
processes at macro- and microlevels logically supplements
the traditional potential of materials science and physical ex
periments . Comprehensive analysis of these studies
makes it possible not only to evaluate features of the
stress-strained state and reasons for failure of ceramic under
action of different loads, but also to formulate new ideas for
creating ceramic materials .
Formalization of internal bonds in such a quite complex
system as a loaded structurally-inhomogeneous material, and
contemporary possibilities of the Solidworks software Simu
lation module, has made it possible to study the separate ef
fect of force and thermal loads on stress inhomogeneity in a
surface layer of zirconium dioxide ceramic [5 – 7]. In addi
tion, it is well known that the combined effect of force and
thermal loads significantly complicates the overall
stress-strained state of ceramic [8 – 13]. It is apparent that in
this case there is also a change in conditions for stress forma-
tion in its surface layer.
The aim of this work is to evaluate stress inhomogeneity
in the surface layer of zirconium dioxide ceramic, formed as
a result of combined action of force and thermal loads.
Solution of the formulated problem is based on numeri
cal modelling of deformation processes using a set of models
[14, 15]. The procedure for performing experiments is simi
lar to that described in the first part of this work . There
fore, here we only note the most important conditions of the
procedure. Numerical experiments were carried out in
Solidworks software Simulation module.
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
ponent D1 consists of three grains Z1, Z2, Z3 of ellipsoidal
shape that are fixed in a matrix through intergranular phase.
At the outer side of grains, intergranular phase, and matrix
there is a fragment of component D2. Grains and matrix of
component D1 are made from zirconium dioxide ZrO
sity r = 5.68 g/cm
, elasticity modulus E = 180 GPa, Pois
son’s ratio m = 0.2), the intergranular phase is made of mag
nesium oxide MgO (r = 3.4 g/cm
, E = 315 GPa, m = 0.18),
Refractories and Industrial Ceramics Vol. 55, No. 1, May, 2014
1083-4877/14/05501-0040 © 2014 Springer Science+Business Media New York
Conclusion. Parts 1 – 3 of the article were published in Novye
Ogneupory Nos. 10 and 12 for 2013 and in No. 1 for 2014.
FGBOU VPO Moscow State Technological University Stankin,