Tiêu chuẩn iso 03376 2011

Reference number ISO 3376 201 1 (E) IULTCS / IUP 6 201 1 (E) © ISO 201 1 INTERNATIONAL STANDARD ISO 3376 IULTCS/IUP 6 Third edition 201 1 1 2 1 5 Leather — Physical and mechanical tests — Determinatio[.]

Refer ence n mb r

ISO 3 7 :2 1 (E)

IULTCS/IUP 6:2 1 (E)

©

ISO 2 1

6

Thir d e itio

2 1 -12-15

Cuir— Es ais p ysiq es et méca iq es — Détermin to de la

résista ce à la tracto et du p urce ta e d'alo g me t

IULTCS/ IUP 6:201 (E)

© ISO 2 1

Al rig ts reserv d Unles oth rwise sp cifie , n p r t of this p blc tio ma b re ro u e or uti ze in a y form or b a y me ns,

ele tr onic or me h nic l in lu in p oto o y in a d microfim, w ith ut p rmis io in writin from eith r ISO at th a dres b low or

ISO's memb r b d in th c u try of th re u ster

ISO c p rig t ofic

Case p stale 5  C -121 Ge e a 2

Tel + 41 2 7 9 01 1

Fa + 41 2 7 9 0 4

E-mai c p rig t@iso.org

We w w iso.org

Pu lsh d in Sw itzerla d

IULT CS/ IUP 6:2011(E)

Foreword

ISO (he International Organization for Stan ar dization) is a worldw ide federation of national stan ard b dies

(ISO memb r b dies) The w ork of pre ar i g Inter national Stan ard is nor maly caried out throu h ISO

tec nical commite s Eac memb r b d inter ested in a s bject for w hic a tec nical commite has b en

esta ls ed has the r i ht to b r epr esented on that commite International organization , governmental an

non-governmental, in laison with ISO, also take p rt in the work ISO cola or ates closely w ith the

Inter national Electrotec nical Commis ion (IEC) on al maters of electr otec nical stan ardization

International Stan ard ar e dr afed in ac ordan e with the rules given in the ISO/IEC Directiv es, Part 2

The main task of tec nical commite s is to pre are International Stan ard Draf Inter national Stan ar ds

ado ted by the tec nical commite s are cir culated to the memb r b dies for votin Publcation as an

International Stan ar d req ir es a pr oval by at le st 7 % of the memb r b dies castin a vote

A ttention is draw n to the p s ibi ty that some of the elements of this doc ment may b the s bject of p tent

rig ts ISO s al not b held r esp n ible for identifyin an or al s c p tent r i hts

ISO 3 7 w as pre ared by the Eur op an Commite for Stan ar dization (CEN) Tec nical Commite

CEN/T C 2 9, L eath r, in cola oration w ith the Ph sical T est Commis ion of the Inter national Union of

L ather Tec nologists an Chemists Societies (IUP Commis ion, IULT CS), in ac ordan e w ith the Agr eement

on tec nical co p ration b tw een ISO an CEN (Vien a A gr eement

IULT CS, or i inaly formed in 18 7, is a w or l -w ide or ganization of profes ional le ther societies to further the

ad an ement of le ther s ien e an tec nolog IULTCS has thre Commis ion , whic ar e resp n ible for

esta ls in inter national method for the sampln an testin of le the ISO recog izes IULTCS as an

international stan ardizin b d for the pre ar ation of test method for le ther

This third edition can els an re laces the secon edition (ISO 3 7 :2 0 ), whic has b en tec nicaly

r ev ised in 4.4, 6.2.1, 7.1 an 8

IULTCS/ IUP 6:2011(E)

This International Stan ar d sp cifies a method for determinin the ten ie str en th, elon ation at a sp cified

lo d an elon ation at br ea of le ther It is a plca le to al typ s of le ther

The folow in referen ed doc ments ar e in isp n a le for the a plcation of this doc ment For dated

r eferen es, only the edition cited a ples For u dated refer en es, the latest edition of the referen ed

doc ment (in lu in an amen ments) a ples

ISO 2 18, L eath r— Ch mical, p ysicala dmech nicala dfastn s tests — Sampln locato

ISO 2 19, L eath r— Ph sicala dmech nicaltests — Sample pre arato a dco di o in

ISO 2 8 , L eath r— Ph sicala dmech nicaltests — Determin to ofthick es

ISO 7 0 -1:2 0 , Metalc materials — Verificato of statc u ia ial testn machin s — Part 1:

Te sio /compres io testn machin s — Verificato a dcalbrato ofth force-me surin system

A test piece is exten ed at a sp cified rate u ti the f or ces re c a predetermined value or u ti the test piece

bre ks

4.1 T en i e te tin ma hin , w ith:

 a for ce r an e a pr opr iate to the sp cimen u der test;

 a me n of recordin the force to an ac urac of at le st 2 % as sp cified by Clas 2 of ISO 7 0 -1;

 a u iform sp ed of se aration of the jaw s of 10 mm/min  2 mm/min;

 a me n of recordin the for ce, e.g as an exten ion c rv e;

 jaws, minimum len th 4 mm in the direction of the a pled lo d, desig ed to a ply con tant clampin by

mec anical or pneumatic me n The texture an desig of he in ide faces of the jaw s s al b s c that,

at the maximum lo d atained in the test, the sp cimen do s not slp in either jaw by an amou t

ex e din 1 % of the original jaw se aration

IULTCS/ IUP 6:201 (E)

4.2 A me n of determinin th e te sion of the te t pie e, either by monitor i g the se aration of the

jaw s or by sen or s whic monitor the se ar ation of tw o fixed p ints on the test piece

4.3 T hick ne s g ug , as sp cified in ISO 2 8

4.4 Pre s k niv es, as sp cified in ISO 2 19, ca a le of c tin a test piece as s ow n in Fig re 1 to the

dimen ion given in Ta le 1

Fig re 1 — Sh pe of te t pie e

T able 1 — Dime sions of te t pie e

Dime sio s in mi metr es

2

1

R

4.5 Vernier c l pers, r eadin to 0,1 mm

5.1 Sample in ac or dan e w ith ISO 2 18

5.2 Fr om the sample, c t six test pieces in ac ordan e with ISO 2 19 by a plyin a pr es knife (4.4) to the

grain s rface, thre test pieces w ith the lon er sides p ralel to the b ckbone an thr ee test pieces with the

lon er sides p rp n ic lar to the b ckbone If previou testin has s own that there is slp age of the test

piece in the jaw s, u e the large pres knife (4.4)

If there is a r eq irement for more than two hides or skin to b tested in one b tc , then only one test piece in

e c dir ection ne d b taken from e c hide or skin, provided that the over al total is not les than thre test

pieces in e c direction

5.3 Con ition the test pieces in ac or dan e w ith ISO 2 19

IULT CS/ IUP 6:2011(E)

6.1.1 Usin ver nier cal p r s (4.5), me s r e the w idth of e c test piece to the ne rest 0,1 mm at thr ee

p sition on the grain side an thr ee on the fles side In e c group of thre me s rements, make one at the

mid-p int E (as s ow n in Fig re 1) an the other tw o at p sition a pr oximately midw ay b tw een the mid

-p int E an the lnes A B an CD Take the ar ithmetic me n of the six me s rements as the width of the test

piece, w For sof ( flexible”) le ther, the width s al b taken as the width of the pr es knife

6.1.2 Me s re the thicknes of e c test piece in ac or dan e w ith ISO 2 8 Make the me s r ements at

thre p sition , namely the mid-p int E an at p sition a pr oximately midway b twe n the mid-p int E an

the lnes A B an CD T ake the arithmetic me n of the thr ee me s rements as the thicknes of the test piece, t

6.2 Determination of te si e strength

6.2.1 Set the jaws of the ten ie testin a p r atu (4.1) 5 mm  1 mm a art if u in the stan ar d test piece

or 10 mm a art if u in the lar ge test piece Clamp the test piece in the jaw s so that the ed es of the jaw s le

alon the lnes A B an CD When the test piece is clamp d, en ure its gr ain s r face les in one plane The

len th axis s al b p r alel to the tr action direction

6.2.2 Ru t he ma c hine u t il t he t est piec e breaks a nd rec ord t he hig est f or c e ex er t ed a s t he brea kin f orc e, F

6.3 Determination of the perc ntage elongation ca s d by a s e ifie load

6.3.1 Clamp the test piece b tw een the jaw s of the a p r atu , as des rib d in 6.2.1 Me s re the distan e

b tw een the jaw s at le st to the ne r est 0,5 mm an record this distan e, L

0 , as the initial len th of the test

piece for the pur pose of the test

6.3.2 Start the test Unles the a p ratu aut omaticaly draws a force/exten ion c rv e with the neces ary

ac urac (se 4.2), folow the distan e b twe n the p ir of jaws or the sen ors as the force in re ses

6.3.3 Note the distan e, in mi imetres, b twe n the p ir of jaws or sen or s at the in tant when the force

first re c es the sp cified value This distan e re resents the len th of the test piece at this force, L

1 Do not

sto the a p ratu if res lts from the pr oced res des rib d in 6.2 or 6.4 are also req ir ed

6.4 Determination of the perce tage elongation at bre k

6.4.1 Carr y out the ste s given in 6.3.1

6.4.2 Ru the ten ie test mac ine u ti the test piece bre ks

6.4.3 Recor d the distan e b tw een the jaw s or sen ors at the in tant w hen rupture of the test piece oc urs

This distan e r epresents the len th of the test piece at bre k, L

2

If ther e is slp age of the test piece in either jaw w hen tested ac or din to 6.2, 6.3 or 6.4, an the slp age is

gre ter than 1 % of the initial jaw se aration, r eject the res lt an re e t the determination w ith a new test

piece c t u in the lar ge pres knife (4.4)

IULTCS/ IUP 6:201 (E)

The ten ie stren th, T

n , in MPa (or new ton p r s uare mi imetr e, if req ired) s al b calc lated u in the

eq ation:

n

F

T





where

F is the hig est for ce recorded, in new ton ;

w is the me n width of the test piece, in mi imetres;

t is the me n thicknes of the test piece, in mi imetres

2

is th folowing: 1 N/mm

2

 1 MPa

7.2 Perc nta e elongation c us d by a s e ifie loa

The p r centage elon ation cau ed by a sp cified lo d, E

1 , s al b calc lated u in the eq ation:

1

0

10

E

L



where

L

1

is the se ar at ion of the jaws or sen ors at the sp cified lo d;

L

0

is the initial se ar ation of the jaw s or sen or s

7.3 Perc nta e elongation at bre k

The p rcentage elon ation at bre k, E

b , s al b calc lated u in the eq ation:

b

0

10

E

L



where

L

2

is the se aration of the jaw s or sen ors at bre k;

L

0

is the initial se aration of the jaw s or sen or s

IULT CS/ IUP 6:2011(E)

The test r ep rt s al in lu e the folow in :

a) a refer en e to this International Stan ard, i.e ISO 3 7 :2 1 ;

b) the me n ten ie str en th, in MPa (or new ton p r s uare mi imetr e), to the ne r est 0,1 MPa, for the test

pieces with the lon er ed e c t p ralel to the b ckbone;

c) the me n ten ie stren th, in MPa (or new ton p r s uare mi imetr e), to the ne r est 0,1 MPa, for the test

pieces w ith the lon er ed e c t p rp n ic lar to the b ck bone;

d) the me n p r centage elon ation at bre k to the ne rest 1 %, for the test pieces with the lon er ed e c t

p r alel to the b ckbone;

e) the me n p r centage elon ation at bre k to the ne rest 1 %, for the test pieces with the lon er ed e c t

p r pen ic lar to the b ckbone;

f the me n p rcentage elon ation at a sp cified lo d to the ne rest 1 %, for the test pieces with the lon er

ed e c t p r alel to the b ckbone; if r eq ired;

g) the me n p r centage elon ation at a sp cified lo d to the ne rest 1 %, for the test pieces with the lon er

ed e c t p rp n ic lar to the b ck bone, if r eq ir ed;

h) the thicknes of the sample, in mi imetres, in ac ordan e w ith ISO 2 8 ;

i) an deviation from the method sp cif ied in this International Stan ard;

j) ful detais for identification of the sample an an deviation from ISO 2 18 w ith resp ct to sampln ;

k) if req ired by the c stomer or in sp cification , it is p rmited to r ep rt the r es lts des rib d in 8 l), 8 m)

an 8 n) in te d of 8 b) to 8 g);

l) the average ten ie str en th, in MPa (or new ton p r s uar e mi imetr e), to the ne r est 0,1 MPa [i.e the

arithmetic me n of b) an c)]

m) the aver age p rcentage elon ation at bre k to the ne r est 1 % [i.e the ar ithmetic me n of d) an e)]

n) the aver age p r centage elon ation at a sp cified lo d to the ne r est 1 % [i.e the arithmetic me n of

f an g)] if req ir ed;

o) the stan ard atmospher e u ed for con itionin an testin , as given in ISO 2 19

IULTCS/ IUP 6:201 (E)

ICS 59.14 30

Pric b s d o 5 p g s

© ISO 2 1 – Al r i hts re erv d