Figure 4 shows that short samples have a great effect of friction at the ends of
the sample and they give excessive values of tensile strength. When the relative
height of the sample is more than 1.5 the effect of friction decreases and samples
with the relative height
h/R
= 2
.
0
; 2,5 can be used for determining (finding) the
compressive strength characteristics. As the height of the samples increases their
destruction can occur in consequence of loosing stability and such samples can
not be also used to determine the compressive strength.
Conclusion.
Numerical and experimental investigation of the deflected mode
of the samples on compression, on base of which it is concluded that the optimal
relative height of the cylindrical samples on compression should be
h/R
= 2
.
5
.
REFERENCES
[1]
Avdeev B.A.
Technique of determining the mechanical properties of materials. M.:
Engineering, 1972. 298 p. (In Russian).
[2]
ASM Handbook
, Vol. 8. Mechanical Testing and Evaluation, ASM International,
Materials Park, OH 44073-0002.
[3]
ASTM Standard
D 695. Standard Method for Compressive Properties of Plastics,
ASTM International, Pa., 2002.
[4]
Chait R.N.
,
Papirno R.F.
Compression Testing of Homogeneous Materials and
Composites, 1983. 294 p.
[5]
Adams D.F.
Current Status of Compression Testing of Composite Materials.
Proceedings of the 40th International SAMPE Symposium, Anaheim, Calif., May
1995.
[6]
Zenkevich O.C.
,
Morgan K.L.
Finite elements and approximation. Trans. from
English. (In Russian). M.: World, 1986. 312 p.
[7]
Reddy J.N.
(2005) An Introduction to the Finite Element Method (Third ed.),
McGraw-Hill. 307 p.
The original manuscript was received by the editors in 11.04.2014
Еремичев Александр Николаевич — канд. техн. наук, доцент кафедры “Космические
аппараты и ракеты-носители” МГТУ им. Н.Э. Баумана. Автор более 50 научных ра-
бот в области испытаний на прочность материалов при сложном напряженном со-
стоянии.
МГТУ им. Н.Э. Баумана, Российская Федерация, 105005, Москва, 2-я Бауманская ул.,
д.5.
A.N. Eremichev — Cand. Sci. (Eng.), assoc. professor of Spacecrafts and Launch Vehicles
department of the Bauman Moscow State Technical University. Author of more than 50
publications in the field of structural tests of materials with compound stress.
Bauman Moscow State Technical University, Vtoraya Baumanskaya ul. 5, Moscow,
105005 Russian Federation.
Издательство МГТУ им. Н.Э. Баумана
Сдано в набор 15.04.2014
Подписано в печать 25.05.2014
Формат
70
×
108
/
16
Усл.-печ. л. 12,25
Уч.-изд. л. 13,1
Заказ
Отпечатано в типографии МГТУ им. Н.Э. Баумана
140 ISSN 0236-3941. Вестник МГТУ им. Н.Э. Баумана. Сер. “Машиностроение”. 2014. № 3
