Tiêu chuẩn iso 07139 1984 scan

International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON MEX,QYHAPO~HAR OPrAHM3A~MR I lO CTAH~APTM3A~MM~ORGANlSATlON INTERNATIONALE DE NORMALISATION Cross country skis Determination of el[.]

INTR ATIO AL O G NIZATIO FO STAD RIZATlO MEX,Q HP ~H R O rAM3A~MR IO CTA~ATM3A~M ~O G NlSTlO INTR ATIO AL DE N RMALISTIO

- 0 terminatio d s car at t&is tiq e @Ias tiq e

spr t eq ipment ski, c r os cou tr y skis, tests,

deter mination, elastic pr opr ties

IS0 (h Internatio al Or ganizatio f or Stan ar dizatio ) is a w orldw id f ed ratio of

natio al stan ar ds bo ie (IS0 member bo ie ) T he w ork of prep r i g Inter natio al

Stan ar ds is n rmaly carr i d o t thr ou h IS0 te h ical c m ite s E c member

b od inter este in a s bje t f or w hic a te h ical c m ite has be n e ta ls e has

t he r i ht to be repr es nte o t h c m ite Inter natio al or ganizatio s, g v er n-

me tal a nd n n-g v er nme tal in lais n w ith ISO, als tak pr t in t he w or k

Dr af t Inter natio al Stan ar ds ad pt ed by th te h ical c m ite s ar e circ late to

t he member bo ie for a pr ov al bef or e th ir ac eptan e as Inter natio al Stan ar ds by

t he IS0 Co n i T he ar e a ppr ov ed in acor dan e w ith IS0 pr oc d r es re uir i g a t

least 75 % a pr ov al by th member bo ie v otin

Spor ts a nd re r eatio al e uipme t

0 International O anization for Stan ardization, 19 4

Printed in S itzerlan

Cr oss-countr y sk is - Deter mination of elastic pr oper ties

This Internatio al Stan ar d spe ifie la or ator y meas r eme t

meth d to d termin t he elastic proper tie of cr os -c u ty

sk is Its pur po e is t o calc late th re istan e of d f in d p r ts

of th sk i to be din

This Inter natio al Stan ar d aple to cro s-c u tr y sk is w ith a

n minal le gth greater t han or e ual to 15 cm

or der t o e s r e c mpra ity betwee la or ator y meas r eme t

da t d ter min d a nd publs e by sk i man f actur er s, in titu-

tio s or oth r s

In this Inter natio al Stan ar d n atempt is mad to r elate t he

meas r eme t da t a to t he q alty of th sk i

IS0 5 0 , Alpin sk is - Deter minatio of th elastic pr oper -

tie

IS 0 6 8 , S s - Terms an d f initio s 1)

For t he d finitio s of sprin c n tant, c, mo ntin point, MP,

and n minal le gth, I s e IS0 6 8

4.1 T he ap r a tu for meas rin th spr i g c n tant of t he

c ntr al s ctio s al c n ist of

a) t w o s p or ts, w hic are plac d at a distan e that is ad-

rolers of 2 m diameter a nd w id e o g to e s r e that

t he te t sk i can be s p orte o its w hole w idth On of th

s por ts w ith low- ictio rolers has a d v ic f or clampin

th e d of t he sk i;

b) a load a plcatio d v ic w ith a n acurac of + 5 N f or

a plcatio of th te t f or ce F, mid-w ay betwee t he s p-

por ts by mean of a c ntact ram w ith a r adiu of 10 m a nd

a w idth to c in t he w hole w idth of th te t sk i;

c) a ln ar meas rin d v ic f or meas r i g t he d f le tio f

w ith a n ac urac of + 0,5 m

4.2 T he apa r atu f or meas rin th s ov el a nd r ear sprin

c n tants s al c n ist of

a) a clampin d v ic , c n istin of a flat jaw a nd thr ee

clamps, e s r i g t h t he w hole w idth of th sk i can be

clampe (s e f ig r e 2 of IS0 5 0 );

b) a load a plcatio d v ic w ith a n acurac of + 2 N f or

aplcatio of t he te t forc s F, a nd F, at an adju ta le

dist an e fom t he e g of h f lat jaw of h clampin d v ic

by mean of a low -fr i tio roler of 2 m diameter a nd

w id e o g t o t ou h th w hole w idth of th te t sk i;

c) a ln ar meas rin d v ic as spe ifie in 4.1 c)

In or der to e s r e c mp ra ity it is r ec m e d d to u e f or

publcatio o ly dat a of th folow in sk i siz s :

15 , 18 or 2 0 cm

From th s three siz s t he o e w hic is mo t r epr es ntativ e for

t he inte d d a plcatio s al be s le te for th sk i mo el c n-

c er ne

Al meas r eme ts s al be ta ke fr om a finis e sk i w ith ut an

an iary e uipme t

Bef or e te tin , th te t sk i s al be c n itio e for at least 2 h

at a temper atur e of 2 + 5 OC

1) At pr esent at the stage of a dr af

6 Pr oced r e

Plac t he sk i o tw o s por ts s t a t a distan e of 0,5 I w ith

u in t he a p r a tu spe ifie in 4.1 a nd s ow n in fig r e 1

A pply a pr e-load of 10 N L oa d th sk i q asi-staticalyl) w ith a

t est load of F, = 2 0 N Read t he d f le tio , fv l, in

mi mete , cau e by t he te t load, FM, w ithin 2 to 5 s a er

t he te t load has be n a ple

Clamp t he sk i in th ap r a tu spe ifie in 4.2 at a pr oje te

distan e xMP

+ 0,2 IN fr om t he tai as s ow n in f ig r e 2

MP

Ap ly a pr e-load of IO N L oa d t he sk i q asi-staticalyl) w ith a

te t load of F, = 40 N Rea d t he d fle tio ,&, in mi mete ,

cau e by t he te t load Fs,

w ithin 2 t o 5 s aer th te t load

has be n a ple

Clamp t he sk i in th a p r at us spe ifie in 4.2 a t a pr oje te

distan e xMP - 0,2 I fr om t he tai as s ow n in fig r e 3

A pply a pm-load of 10 N L oa d t he sk i q asi-staticalyl) w ith a

t est load of FR

= 40 N Rea d th d f le tio ,&, in mi mete ,

cau e by th te t load FR w ithin 2 t o 5 s a er th te t load has

be n a ple

0,s 1

N

-

Dimen ion in mi metres

X

MP

Fig r e 1 -

Dimen ion in mi metres

X

MP

Fig r e 2 -

I Th is men that the r ate of deflection is les than 2 m /min

Dimen ion in mi metr es

20

X

M,-O,~S~N

X

MP

For eac pr oper ty, calc late th sin le r es lts of thr ee te ts,

re or din th ir mean

T he r ec m e d d u it f or t he sprin c n tant, c, is n w t on

per mi mete (N/mm)

If da t a ar e publs e by t he man f actur er w ith r ef er en e t o this

Inter natio al Stan ar d, t he f olow in toleran e ran e s al be

obs r v ed :

9 T est r ep r t

T he te t r epor t s al in lu e th f olow in p ric lars :

a) r ef eren e t o this Internatio al Stan ar d;

b) name of distibutor or man f actur er ;

c) t r ad mark a nd mo el d sig atio ;

d) n minal le gth;

e) imprinte s rial n mber ;

f te t re ults (s e clau e 7);

g) an d v iatio fom this Inter natio al Stan ar d w ith a n

e planatio of t he r eas n for th d v iatio