ISO 844:1978
(Main)Cellular plastics — Compression test of rigid materials
Cellular plastics — Compression test of rigid materials
Plastiques alvéolaires — Essai de compression des matériaux rigides
Penjeni polimerni materiali - Trde pene - Tlačni preskus
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INTERNATIONAL STANDARD 844
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME)((LIYHAPOAHAR OPrAHH3AUHfl fl0 CTAHAAPTH3A~HH.ORGANfSATlON INTERNATIONALE DE NORMALISATION
\
L-
Cellular plastics - Compression test for rigid materials
Plastiques alvéolaires - Essai de compression des matériaux rigides
First edition - 1978-09-01
---.-
~~
678-496.8 : 678.01 : 539.411 Ref. NO. IS0 844-1978 (E)
UDC
Descriptors : plastics, cellular materials, cellular plastics, tests, compression tests.
Price based on 3 pages
, I
---------------------- Page: 1 ----------------------
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
(IS0 member bodies). The work of developing
of national standards institutes
International Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set
up has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated
as International
to the member bodies for approval before their acceptance
IS0 Council.
Standards by the
IS0 844 was developed by Technical Committee
InTernational Standard
Plastics, and was circulated to the member bodies in November 1975.
ISO/TC 61,
It has been approved by the member bodies of the following countries :
Romania
Australia Hungary
South Africa, Rep. of
Austria India
Spain
Belgium Iran
Sweden
Brazil Israel
Canada Italy Switzerland
Turkey
Czechoslovakia Japan
United Kingdom
Finland Mexico
U.S.A.
France New Zealand
U.S.S. R.
Germany Poland
__-
No member body expressed disapproval of the document
This International Standard cancels and replaces IS0 Recommendation R 844-1 968,
of which it constitutes a technical revision.
6 international Organization for Standardization, 1978
Printed in Switzerland
---------------------- Page: 2 ----------------------
INTERNATIONAL STANDARD IS0 844-1978 (E)
Cellular plastics - Compression test for rigid materials
SCOPE AND FIELD OF APPLICATION 5 APPARATUS
1
This International Standard specifies a method of deter-
5.1 Compression testing machine
mining
Any compression testing machine suited to the range of
the compressive strength and corresponding relative
a)
force and displacement involved and having two square
L deformation,
or circular plane parallel plates which are polished and
or
cannot be deformed, and of which the length of one side
b) the compressive stress at 1 O % relative deformation
(or the diameter) is at least 10 cm. One of the plates shall
be fixed and the other movable; the latter shall be capable
of rigid cellular plastics.
of moving at a constant rate of displacement in accordance
with the conditions laid down in clause 7.
2 REFERENCES
IS0 291, Plastics - Standard atmospheres for conditioning
5.2 Measuring devices for displacement and force
and testing.
IS0 1923, Cellular materials - Determination of linear
5.2.1 Measurement of displacement
dimensions.
The compression testing machine shall be fitted with a
system allowing continuous measurement of the displace-
3 PRINCIPLE
ment x of the movable plate with an accuracy of * 5 %
or * 0,l mm if this latter value is a more accurate measure-
Application, at constant speed, of a compressive force in an
ment (see note after 5.2.2).
axial direction to the faces of a rectangular parallelepiped
test specimen. Calculation of the maximum stress supported
5.2.2 Measurement of force
by the test specimen.
A force sensor shall be fixed to one of the machine plates
If the value of the maximum stress corresponds to a relative
L
in order to measure the force F produced by the reaction
deformation of less than 10 %, it is noted as the "compress-
of the test specimen upon the plates during the test. This
ive strength". Otherwise, the compressive stress at 10 %
sensor shall be such that its own deformation during the
relative defprmation is calculated and its value noted as
the "compressive stress at 1 O % relative deformation". course of the measuring operation is negligible compared
with that being measured and in addition it shall allow the
continuous measurement of the force at any point in time
4 DEFINITIONS
with an accuracy off 1 %. (See note.)
4.1 relative deformation (E) : Quotient of the reduction
NOTE - It is recommended that a device be used for the simul-
(in relation to its initial value) in thickness of the test taneous recording of the force F and the displacement x that allows,
by obtaining a curve of F = fk), the graphical determination of the
specimen by its initial thickness. It is expressed as a per-
pair of values of F, x, required in clause 8 with the accuracy laid
centage.
down in 5.2.1 and 5.2.2 and provides additional information on the
behaviour of the product.
4.2 compressive strength (U,) : Quotient of the maximum
compressive force F,, reached when the relative defor-
5.2.3 Calibra tion
mation E is < 10 %, by the initial surface area of the cross-
section of the test specimen. The relative deformation cor-
The readings of force and displacement provided by the
U, is noted as E,.
responding to
measuring devices of the compression testing machine (and,
if applicable, by its graphical recording device) shall be
4.3 compressive stress at 10 % relative deformation (U, : a series of standard masses
checked periodically using
Quotient of the compressive force F, at 10 % relative
(corresponding to the sensitivity used for the forces) and
deformation (E,~), by the initial surface area of the cross-
spacers of thickness all of which are known to a greater
section of the test specimen.
degree of accuracy than that required in 5.2.1 and 5.2.2.
1
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7 PROCEDURE
5.3 Instruments for measuring the dimensions of the test
specimens shall be in accordance with IS0 1923.
The testing t
...
SLOVENSKI STANDARD
SIST ISO 844:1996
01-januar-1996
3HQMHQLSROLPHUQLPDWHULDOL7UGHSHQH7ODþQLSUHVNXV
Cellular plastics -- Compression test of rigid materials
Plastiques alvéolaires -- Essai de compression des matériaux rigides
Ta slovenski standard je istoveten z: ISO 844:1978
ICS:
83.100 Penjeni polimeri Cellular materials
SIST ISO 844:1996 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST ISO 844:1996
---------------------- Page: 2 ----------------------
SIST ISO 844:1996
INTERNATIONAL STANDARD 844
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME)((LIYHAPOAHAR OPrAHH3AUHfl fl0 CTAHAAPTH3A~HH.ORGANfSATlON INTERNATIONALE DE NORMALISATION
\
L-
Cellular plastics - Compression test for rigid materials
Plastiques alvéolaires - Essai de compression des matériaux rigides
First edition - 1978-09-01
---.-
~~
678-496.8 : 678.01 : 539.411 Ref. NO. IS0 844-1978 (E)
UDC
Descriptors : plastics, cellular materials, cellular plastics, tests, compression tests.
Price based on 3 pages
, I
---------------------- Page: 3 ----------------------
SIST ISO 844:1996
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
(IS0 member bodies). The work of developing
of national standards institutes
International Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set
up has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated
as International
to the member bodies for approval before their acceptance
IS0 Council.
Standards by the
IS0 844 was developed by Technical Committee
InTernational Standard
Plastics, and was circulated to the member bodies in November 1975.
ISO/TC 61,
It has been approved by the member bodies of the following countries :
Romania
Australia Hungary
South Africa, Rep. of
Austria India
Spain
Belgium Iran
Sweden
Brazil Israel
Canada Italy Switzerland
Turkey
Czechoslovakia Japan
United Kingdom
Finland Mexico
U.S.A.
France New Zealand
U.S.S. R.
Germany Poland
__-
No member body expressed disapproval of the document
This International Standard cancels and replaces IS0 Recommendation R 844-1 968,
of which it constitutes a technical revision.
6 international Organization for Standardization, 1978
Printed in Switzerland
---------------------- Page: 4 ----------------------
SIST ISO 844:1996
INTERNATIONAL STANDARD IS0 844-1978 (E)
Cellular plastics - Compression test for rigid materials
SCOPE AND FIELD OF APPLICATION 5 APPARATUS
1
This International Standard specifies a method of deter-
5.1 Compression testing machine
mining
Any compression testing machine suited to the range of
the compressive strength and corresponding relative
a)
force and displacement involved and having two square
L deformation,
or circular plane parallel plates which are polished and
or
cannot be deformed, and of which the length of one side
b) the compressive stress at 1 O % relative deformation
(or the diameter) is at least 10 cm. One of the plates shall
be fixed and the other movable; the latter shall be capable
of rigid cellular plastics.
of moving at a constant rate of displacement in accordance
with the conditions laid down in clause 7.
2 REFERENCES
IS0 291, Plastics - Standard atmospheres for conditioning
5.2 Measuring devices for displacement and force
and testing.
IS0 1923, Cellular materials - Determination of linear
5.2.1 Measurement of displacement
dimensions.
The compression testing machine shall be fitted with a
system allowing continuous measurement of the displace-
3 PRINCIPLE
ment x of the movable plate with an accuracy of * 5 %
or * 0,l mm if this latter value is a more accurate measure-
Application, at constant speed, of a compressive force in an
ment (see note after 5.2.2).
axial direction to the faces of a rectangular parallelepiped
test specimen. Calculation of the maximum stress supported
5.2.2 Measurement of force
by the test specimen.
A force sensor shall be fixed to one of the machine plates
If the value of the maximum stress corresponds to a relative
L
in order to measure the force F produced by the reaction
deformation of less than 10 %, it is noted as the "compress-
of the test specimen upon the plates during the test. This
ive strength". Otherwise, the compressive stress at 10 %
sensor shall be such that its own deformation during the
relative defprmation is calculated and its value noted as
the "compressive stress at 1 O % relative deformation". course of the measuring operation is negligible compared
with that being measured and in addition it shall allow the
continuous measurement of the force at any point in time
4 DEFINITIONS
with an accuracy off 1 %. (See note.)
4.1 relative deformation (E) : Quotient of the reduction
NOTE - It is recommended that a device be used for the simul-
(in relation to its initial value) in thickness of the test taneous recording of the force F and the displacement x that allows,
by obtaining a curve of F = fk), the graphical determination of the
specimen by its initial thickness. It is expressed as a per-
pair of values of F, x, required in clause 8 with the accuracy laid
centage.
down in 5.2.1 and 5.2.2 and provides additional information on the
behaviour of the product.
4.2 compressive strength (U,) : Quotient of the maximum
compressive force F,, reached when the relative defor-
5.2.3 Calibra tion
mation E is < 10 %, by the initial surface area of the cross-
section of the test specimen. The relative deformation cor-
The readings of force and displacement provided by the
U, is noted as E,.
responding to
measuring devices of the compression testing machine (and,
if applicable, by its graphical recording d
...
NORME INTERNATIONALE 844
INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON.MEW(LIYHAPO4HAR OPrAHHJAUWR Il0 CTAH4APTH3AUHH.ORGANlSATlON INTERNATIONALE DE NORMALISATION
“L Plastiques alvéolaires - Essai de compression des matériaux
rigides
Cellular plastics - Compression test for rigid materials
Première édition - 1978-09-01
CDU 678-496.8 : 678.01 : 539.411 Réf. no : IS0 844-1978 (F)
Descripteurs : matière plastique, matière alvéolaire, produit alvéolaire rigide, essai, essai de compression.
Prix basé sur 3 pages
---------------------- Page: 1 ----------------------
AVANT-PROPOS
L’ISO (Organisation internationale de normalisation) est une fédération mondiale
d’organismes nationaux de normalisation (comités membresde I’ISO). L’élaboration
des Normes internationales est confiée aux comités techniques de I‘ISO. Chaque
comité membre intéressé par une étude a le droit de faire partie du comité technique
correspondant. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I’ISO, participent également aux travaux. U’
Les projets de Normes internationales adoptés par les comités techniques sont
soumis aux comités membres pour approbation, avant leur acceptation comme
Normes internationales par le Conseil de I‘ISO.
La Norme internationale IS0 844 a été élaborée par le comité technique
ISO/TC 61, Plastiques, et a été soumise aux comités membres en novembre 1975.
Les comités membres des pays suivants l‘ont approuvée :
Pologne
Afrique du Sud, Rép. d’ France
Allemagne Hongrie Roumanie
Australie Inde Royaume-Uni
Autriche Iran Suède
Suisse
Belgique Israël
Tchécoslovaquie
Brésil Italie
Turquie
Canada Japon
U.R.S.S.
Espagne Mexique
Nouvelle-Zélande U.S.A.
Finlande
Aucun comité membre ne l‘a désapprouvée.
Cette Norme internationale annule et remplace la Recommandation ISO/R 844-1 968,
dont elle constitue une révision technique.
Organisation internationale de normalisation, 1978 0
Imprimé en Suisse
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~~
IS0 844-1978 (F)
NORM E I NTE R NAT ION AL E
Plastiques alvéolaires - Essai de compression des matériaux
rigides
1 OBJET ET DOMAINE D'APPLICATION
5 APPAREILLAGE
La présente Norme internationale spécifie une méthode de
5.1 Machine d'essai de compression
détermination de
a) la résistance à la compression et la déformation Toute machine d'essai de compression appropriée au
L relative correspondante, domaine de force et de déplacement à mettre en œuvre,
munie de deux plateaux parallèles, plans, polis, indéfor-
ou de
mables, carrés ou circulaires, dont le côté (ou le diamètre)
b) la contrainte en compression à 10 % de déformation
soit au moins égal à 10cm. L'un des plateaux doit être
relative
fixe, l'autre mobile et pouvant être animé d'une vitesse
des matériaux alvéolaires rigides.
de déplacement constante, répondant aux prescriptions
du chapitre 7.
2 RÉFÉRENCES
5.2 Dispositifs de mesurage du déplacement et de la force
IS0 291, Plastiques - Atmosphères normales de condition-
nement et d'essai.
5.2.1 Mesurage du déplacement
IS0 1923, Matières alvéolaires - Détermination des dimen-
La machine d'essai de compression doit être pourvue d'un
sions linéaires.
système permettant le mesurage en continu du déplacement
x du plateau mobile avec une justesse de f 5 % ou de
3 PRINCIPE
k 0,l mm si cette dernière valeur correspond à une mesure
plus juste. (Voir la note après 5.2.2.)
Application, à vitesse constante, d'un effort de compression
de direction axiale sur les faces d'une éprouvette parallélé-
5.2.2 Mesurage de la force
pipédique rectangle. Calcul de la contrainte maximale
supportée par l'éprouvette.
Un capteur de force doit être fixé à l'un des plateaux de
L
la machine, de façon à mesurer la force F produite par
Si la valeur de la contrainte maximale correspond à une
réaction de l'éprouvette sur les plateaux au cours de l'essai.
déformation relative inférieure à 1 O %, elle est notée comme
Ce capteur doit être tel que sa propre déformation au cours
étant la ((résistance à la compression)). Sinon, la contrainte
du mesurage soit négligeable devant celle qui est à mesurer,
en compression à 10 % de déformation relative est calculée
et permettre, en outre, le mesurage en continu de la charge
et sa valeur est notée comme étant la ((contrainte en
à chaque instant avec une justesse de f 1 %. (Voir la note.)
compression à 10 % de déformation relative)).
NOTE - II est recommandé d'utiliser un dispositif d'enregistrement
simultané de la force F et du déplacement x, permettant, par
4 DÉFINITIONS
l'obtention de la courbe F = f(x), la détermination graphique des
couples de valeurs (F, x) indiqués dans le chapitre 8, avec les
4.1 déformation relative (E) : Quotient de la réduction
justesses exigées en 5.2.1 et 5.2.2, et fournissant des indications
(par rapport à sa valeur initiale) en épaisseur de l'éprouvette complémentaires sur le comportement du produit.
par son épaisseur initiale. Elle est exprimée en pourcentage.
5.2.3 Etalonnage
4.2 résistance à la compression (U,) : Quotient de la force
maximale de compression F,, atteinte pour E < 10 %, par
Les indications de force et de déplacement fournies par les
l'aire initiale de la section droite de l'éprouvette. La défor-
dispositifs de mesure de la machine d'essai de compression
à U, est notée E~.
mation relative correspondant
(et, éventuellement, par son dispositif d'enregistrement
graphique) doivent être vérifiées périodiquement en utili-
4.3 contrainte en compression à 10 % de déformation sant une série de masses marquées (correspondant aux sensi-
relative (U, : Quotient de la force de compression F, à bilités utilisées pour les forces) et de cales d'épaisseur,
une déformation relative de 10 % (E,~), par l'aire initiale toutes connues avec de meilleures justesses que celles
de la section droite de l'éprouvette. exigées en 5.2.1 et 5.2.2.
1
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IS0 844-1978 (F)
7 MODE OPÉRATOIRE
5.3 Matériel de mesurage des dimensions des éprouvettes,
conforme aux spécifications de I'ISO 1923.
La température d'essai doit être la même que celle du
conditionnement.
Mesurer les trois dimensions de l'éprouvette suivant
I'
...
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