INFLUENCE OF THE SIZE OF A PATCH
ON THE SHEAR STRENGTH OF AN ADHESIVE JOINT
E. I. Suzdal’tsev
and E. V. Mironova
Translated from Novye Ogneupory, No. 4, pp. 44 – 46, April, 2014.
Original article submitted November 15, 2013.
An analysis of the shear strength of samples of the metal – sealant – ceramic system in the case of different ar
eas of the adhesive joint is presented.
Keywords: shear strength, area of joint, sealant
Tests of patches of ceramic prisms with metallic plates
are performed for the purpose of certification of articles that
represent an assemblage of a ceramic shell with a metallic
transverse frame produced by means of Viksint U-2-28NT
organic sealant, moreover the area of the adhesive joints in
the articles and that of the check samples differ significantly.
If it is provisionally assumed that the area of the adhe-
sive joint in the article is equal to the area of the lateral sur-
face of a cylinder and that the area of the adhesive joint in the
sample represents the area of a rectangle with known sides,
then for different articles the ratio of these areas may range
from 1/100 to 1/400.
Here the area of the lateral surface of a cylinder is calcu
lated by means of the formula
where r is the radius of the endface of the article and h the
height of the adhesive joint.
The substantial difference in the areas raises the question
of the commensurability of the magnitudes of the strength of
the adhesive joint of a metal – sealant – ceramic system in
samples for tests and in particular articles.
With this in mind, the objective of the present study was
to determine the influence of the area of a patch on the
strength of an adhesive joint.
Three batches of metallic plates measuring 20 ´ 60 (stan-
dard), 20 ´ 75, and 20 ´ 90 mm as well as three batches of
ceramic prisms measuring 20 ´ 15 (standard), 20 ´ 30, and
20 ´ 45 mm were fabricated for the studies. The samples of
metal and ceramic were then glued with U-2-28NT sealant to
the above plates and prisms of the respective dimensions.
Shear strength tests of the adhesive joint were performed
with the use of special devices and the P-0.5 breaking ma
chine. A load on the samples in each of the batches was ap
plied along adhesive joints of different lengths.
The actual thickness of the glue line was determined
prior to the tests by means of the formula
, and h
are, respectively, the thick
ness of the glue line, of the sample in the fitting, of the ce
ramic sample, and of the metallic sample. The mean thick
ness of the glue line in each of the batches was from 0.30 to
– B ) ´ 100, (3)
was used to calculate the area of the adhesive joint, where a
are the length of the adhesive joint; b
width of the ceramic and metallic samples, respectively, near
Refractories and Industrial Ceramics Vol. 55, No. 2, July, 2014
1083-4877/14/05502-0148 © 2014 Springer Science+Business Media New York
GNTs Russian Federation OAO Obninsk Tekhnologiya Scientific
Production Enterprise, Obninsk, Kaluga District, Russia.
E. I. Suzdal’tsev, E. V. Mironova, P. Yu. Yakushkin, et al., Influ
ence of thickness of glue line and roughness of metallic substrate
on strength properties of a metal — ceramic adhesive joint, All
Materials: Encyclopedic Reference [in Russian] (OOO Nauka i
Tekhnologiya, Moscow), No. 8, 50 – 58 (2013).