Detail publikace
ACCURACY ESTIMATION OF ELASTICITY MODULI EVALUATED BY FOUR-POINT BENDING
BURŠA, J. JANÍČEK, P. VAJDÁK, M.
Český název
ACCURACY ESTIMATION OF ELASTICITY MODULI EVALUATED BY FOUR-POINT BENDING
Anglický název
ACCURACY ESTIMATION OF ELASTICITY MODULI EVALUATED BY FOUR-POINT BENDING
Typ
článek v časopise - ostatní, Jost
Jazyk
en
Originální abstrakt
The present paper deals with practical applicability of four-point bending in determination of elasticity moduli. In [1] and [2], a theory was derived for evaluation of elasticity moduli by four point bending, namely for materials showing different moduli in tension and in compression, and for thin layers (e.g. plasmatic coatings), respectively. The limitations for reasonable exploitation of this method lie in the inaccuracy of results. As it can be expected, and as it was already mentioned in [2], the influence of input quantities inaccuracy on the results error can be very substantial. This is, in particular, the case of thin layers; since the measured plasmatic layer represents a small part of the specimen cross – section (usually less than 10%), the influence of the layer parameters (modulus of elasticity, thickness) on the resulting strain is relatively low. In an inverse problem, consequently, small changes in measured strains or thickness can result in large deviations in the determined moduli of elasticity for these layers. These non-linear dependences are analysed in the paper and, as a consequence, general rules for practical use of this method are formulated.
Český abstrakt
The present paper deals with practical applicability of four-point bending in determination of elasticity moduli. In [1] and [2], a theory was derived for evaluation of elasticity moduli by four point bending, namely for materials showing different moduli in tension and in compression, and for thin layers (e.g. plasmatic coatings), respectively. The limitations for reasonable exploitation of this method lie in the inaccuracy of results. As it can be expected, and as it was already mentioned in [2], the influence of input quantities inaccuracy on the results error can be very substantial. This is, in particular, the case of thin layers; since the measured plasmatic layer represents a small part of the specimen cross – section (usually less than 10%), the influence of the layer parameters (modulus of elasticity, thickness) on the resulting strain is relatively low. In an inverse problem, consequently, small changes in measured strains or thickness can result in large deviations in the determined moduli of elasticity for these layers. These non-linear dependences are analysed in the paper and, as a consequence, general rules for practical use of this method are formulated.
Anglický abstrakt
The present paper deals with practical applicability of four-point bending in determination of elasticity moduli. In [1] and [2], a theory was derived for evaluation of elasticity moduli by four point bending, namely for materials showing different moduli in tension and in compression, and for thin layers (e.g. plasmatic coatings), respectively. The limitations for reasonable exploitation of this method lie in the inaccuracy of results. As it can be expected, and as it was already mentioned in [2], the influence of input quantities inaccuracy on the results error can be very substantial. This is, in particular, the case of thin layers; since the measured plasmatic layer represents a small part of the specimen cross – section (usually less than 10%), the influence of the layer parameters (modulus of elasticity, thickness) on the resulting strain is relatively low. In an inverse problem, consequently, small changes in measured strains or thickness can result in large deviations in the determined moduli of elasticity for these layers. These non-linear dependences are analysed in the paper and, as a consequence, general rules for practical use of this method are formulated.
Klíčová slova česky
Modul pružnosti, čtyřbodový ohyb
Klíčová slova anglicky
Modulus of elasticity, four-point bending
Rok RIV
2004
Vydáno
01.12.2004
ISSN
1210-2717
Ročník
11
Číslo
6
Počet stran
12
BIBTEX
@article{BUT46483,
author="Jiří {Burša} and Přemysl {Janíček} and Michal {Vajdák},
title="ACCURACY ESTIMATION OF ELASTICITY MODULI EVALUATED BY FOUR-POINT BENDING",
year="2004",
volume="11",
number="6",
month="December",
issn="1210-2717"
}