Fig. 3. The fracture mode of cylindrical samples under compression (from right to
left
h/R
= 0
,
50
; 1,00; 1,75; 2,00 and 3,00)
The effect of the relative height of the sample on the maximum compression
σ
(the compression at which the sample is destroyed) as investigated experimentally
in this paper.
When the velocity of the active gripping of testing machine was 0.5 mm/min,
the samples of 20 mm in diameter with the relative height
h/R
= 0
.
50
; 1.00; 1.50;
1.75; 2.00; 2.25; 2.50 and 3.00 were tested. Each series with the same relative
height consisted of eight samples. The samples were prepared by mechanical
processing from highly filled polymeric material.
Maximum tension was determined with the instrumental error not exceeding
0.2MPa.
The fracture mode of almost all samples with different relative height was
similar (Fig. 3). There was a shift of one part of a sample toward another along a
plane inclined to the axis of the sample at an angle of approximately 450.
Dependence of compressive strength
σ
defined as the average according to
the results of testing eight samples for each relative height of the sample
h/R
is
shown in figure 4.
Fig. 4. The dependence of compressive
strength
σ
from the relative height of
the samples
ISSN 0236-3941. Вестник МГТУ им. Н.Э. Баумана. Сер. “Машиностроение” 2014. № 3 139
