IS 2855: Thermostat metals - Determination of flexivity

15 Pages·1991·1.5 MB·English

by  Bureau of Indian Standards

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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 2855 (1991): Thermostat metals - Determination of
flexivity [MTD 3: Mechanical Testing of Metals]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

. <. .
;.’ -18 2855 : IQQl. >.
wch JTm

Indian Staljdard
THERMOSTAT METALS-DETERMINii'kIOt;i ~>"-
OF FLEXIVITY i i:
(F irst Revision
)
: :
UDC 669’018’4-418’2 : 620’115’8 ., .. , . . ,

@ BIS 1991
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
November 1991 Price Group 4

!!!a
lacinahceM gnitseT fo Metals lanoitCeS ,eettimmoC DTM 3
FOREWORD
sihT naidnI dradnatS ( tsriF noisiveR ) was detpoda yb eht uaeruB fo naidnI Standards, retfa
tfard dezilanif yb eht lacinahceM gnitseT fo Metals lanoitceS eettimmoC had neeb devorppa
yb eht lacigrullateM gnireenignE noisiviD .licnuoC
tatsomrehT slatem era desu rof making cillatemib sretemomreht and citatsomreht ,slortnoc
rieht main snoitacilppa gnieb ni ( i ) erutarepmet noitacidni and lortnoc ( ii ) noitasnepmoc
secived ni suoirav smsinahcem ( iii ) smrala-erif and ,srekaerb-tiucric .cte
sihT standard was tsrif dehsilbup ni 1964. nI this noisiver gniwollof segnahc evah neeb :edam
)a ehT stnemeriuqer fo tset nemiceps evah neeb ;deifidom
)b tseT dohtem rof gnirusaem ytivixelf fo spiral slioc has neeb ;dedda and
)c noisicerP and saiB evah neeb .deificeps
nI gnisiver this standard assistance has neeb devired morf gniwollof standards dehsilbup yb
naciremA yteicoS rof gnitseT and :slairetaM
MTSA B 106 : 84 tseT sdohteM rof ytivixelP fo tatsomrehT Metals
MTSA B 389 : 81 tseT dohteM rof lamrehT noitcelfeD etaR fo laripS and lacileH slioC fo
tatsomrehT Metals
dn gnitroper eht tluser 8 fo a tset edam ni ecnadrocca htiw this standard, fi eht lanif ,eulav
devresbo ro ,detaluclac is ot eb dednuor ,ffo ti shall eb enod ni ecnadrocca htiw SI 2 : 1960
selu% rof gnidnuor ffo laciremun seulav ( revimd )‘.
IS 2855 : 1991
Indian Standard
THERMOSTAT METALS - DETERMINATION
OF FLEXIVITY
( First Revision
>
1 SCOPE To enimreted eht ytivixelf neewteb yna owt
serutarepmet Tl and T, ti is yrassecen ot
1.1 sihT standard seificeps eht serudecorp rof erusaem eht erutavruc l/R1 and l/R, at -met
noitanimreted fo eht ytivixelf fo eht -omreht
erutarep Tl and T, .ylevitcepser oT dnif eht
stat slatem ( dohteM A ) detset ni eht mrof fo
erutavruc at rehtie ,erutarepmet erusaem eht
talf strips 03-O mm ro revo ni ssenkciht and
ecnatsid )D( as nwohs ni giF 1. ehT erutavruc
( dohteM B ) detset ni eht mrof fo spiral slioc
is nevig yb eht gniwollof :noitauqe
less than 0.30 mm ni .ssenkciht
1.2 ytivixelF is denimreted rof tatsomreht l/R = 8D/ ( Q”+4 Dt + 4 Da ) (2)
latem as a ,elohw on tnuocca gnieb nekat rof
eht scitsiretcarahc fo eht laudividni -opmoc erehw
.stnen
F = ytivixelf ni ,Comm/mm
2 TERMINOLOGY radius fo erutavruc fo eht lanidutignol
R=
ertnec enil fo eht nemiceps ni ,mm
2.1 Component
ssenkciht fo tset nemiceps ni ,mm
enO fo eht etani.mal fo a tatsomreht latem t
hcihw ni noitcnujnoc htiw eht rehto -opmoc QZ drrrilzid neewteb troppus stniop ni
)s(tnen senimreted eht ytivitisnes ot a -avruc 9
erut egnahc htiw a erutarepmet .egnahc
rof tniop troppus = ralucidneprep dis-
D=
2.2 ytivixelF ecnat neewteb eht lanidutignol ertnec
senil fo eht rewol ecafrus fo eht -iceps
2.2.1 Flat Strips nem yawdim neewteb eht tniop
‘F’ eht egnahc fo erutavruc fo eht lanidutignol troppus and eht straight enil gninioj
ertnec enil ( lartuen sixa ) fo eht nemiceps rep eht troppus ,stniop .mm
tinu erutarepmet egnahc rof tinu ,ssenkciht

nevig yb eht gniwollof :noitauqe 2.2.2 Spiral Coils

- ( t-)BRi‘ ),RI‘ t ‘F’ is denifed yb eht gniwollof :noitauqe
I;_ (1)
1T - lT F = )l(510*0 4 L/td
FIG. 1 TEST FORF LBXIVITYO F THERMOSTATM ETALS
1
SI 2855 : 1991
erehw 3.4 Temperature Measuring Apparatus
F = ytivixelf ni ,C”mm/mm tI shall eb fo hcus ycarucca that eht laudividni
serutarepmet shall eb nwonk ot nihtiw .C”3*0
d = lamreht noitcelfed etar fo tset
nemiceps ni angular !Y/seerged 3.5 Deflection Index
([ A, - Al ,’Z(/) - 1T ]) erehw A, and A,
Means shall eb dedivorp rof gnirusaem eht
era angular snoitisop at erutarepmet
noitcelfed fo eht nemiceps at a tniop yawdim
Tl and T,,
neewteb eht stniop fo troppus and gnola eht
c ssenkciht.= fo tset nemiceps ni ,mm and lacitrev enil gnitcesretni eht enil gninioj eht
stniop fo .troppus hcuS snaem yam esirpmoc
L = evitca htgnel fo tset nemiceps ni .mm a ztrauq-desuf noissimsnart dor desopsid htiw
its sixa lacitrev and gnitanimret ni a tniop ro
2.3 Thermostat Metal egde-efink hcihw shall egagne eht nemiceps
A etisopmoc lairetam gnitsisnoc fo owt ro yawdim neewteb eht stniop fo tcatnoc htiw
erom ,slairetam cillatem ro esiwrehto gnivah eht .stroppus hcuS a noissimsnart dor shall eb
gnireffid seitivisnapxe hcihw sesuac an -aretla detnuom ni hcus a rennam that ti is eerf ot
noit fo its erutavruc nehw its erutarepmet is evom ni eht noitcerid fo its .sixa ehT dor shall
.degnahc tatsomrehT latem is ni eht mrof fo raeb at its eerf and an xedni elbatius rof
teehs ro .pirts epocsorcim noitavresbo ro esle an lacirtcele
tcatnoc htiw hcihw a retemorcim lliw timrep
eht segnahc fo eht noitcelfed fo nemiceps ot
METHOD A - FLAT STRIPS
eb yletarucca .devresbo ylevitanretlA eht
noitcelfed fo eht tniopdim fo eht nemiceps yam
3 APPARATUS eb yltcerid devresbo yb lacitpo snaem esohw
enil fo sight is latnoziroh and passes hguorht
3.1 Specimen Carrier
eht lacitrev enil hguorht eht tniopdim fo eht
tI shall eb dedivorp htiw owt lacinoc stroppus .nemiceps A retemorcim wercs htiw dednetxe
rof gnitacol eht .nemiceps ehT tset htgnel eldnips making tcerid tcatnoc htiw eht -iceps
( that is, eht ecnatsid neewteb eht tniop fo nem yam eb .desu nI this esac lacirtcele
tcatnoc fo eht nemiceps htiw eno troppus and snaem shall eb dedivorp that lliw etacidni
eht tniop fo tcatnoc fo eht nemiceps htiw eht tcatnoc tuohtiw tnacifingis ecnabrutsid fo eht
rehto troppus ) shall eb nwonk ot nihtiw .nemiceps ehT tnemerusaem fo eht noitisop
31.0f mm and eht enil fo enalp passing hguorht fo eht tniopdim fo eht tset nemiceps shall eb fo
eht stniop fo tcatnoc shall eb .latnoziroh ehT hcus ycarucca that eht laudividni snoitisop at
nemiceps reirrac and stroppus shall dloh eht eht tset serutarepmet shall eb nwonk ot nihtiw
nemiceps tuohtiw tniartsnoc os that eht 500.0f .mm
,erutavruc eud ot its ,noitcelfed lliw wollof a
3.5.1 fI a noissimsnart dor is ,desu ti and yna
lacitrev enalp passing hguorht eht enil gninioj dehcatta parts shall eb fo hcus thgiew ro os
eht stniop fo tcatnoc neewteb nemiceps and retnuoc dehgiew that yeht lliw ton esuac a
.stroppus
noitcelfed retaerg than u/ol fo eht mumixam ot
3.2 Micrometer ( Travelling Microscope, ro eb decudorp yb eht noitca fo eht tatsomreht
latem .enola nehW ,eerf eht tatsomreht latem
Equivalent Device )
assured yrev ylraen a ralucric .erutavruc
tI shall eb os detcennoc ot eht nemiceps reirrac detartnecnoC gnidaol at eht ertnec fo eht
that noisnapxe gnirud gnitaeh fo eht reirrac ro nemiceps lliw esuac eht erutavruc ot eb rehto
gnitcennoc parts lliw ton esuac elbaicerppa than ralucric and yam esuac tnacifingis srorre
tnemecalpsid fo eht gnirusaem ecived htiw ni eht noitaulave fo .ytivixelf ehT noitacol fo
tcepser ot eht .stroppus eht enil passing hguorht eht stniop fo tcatnoc
neewteb nemiceps and stroppus shall eb nwonk
3.3 Temperature Bath htiw ecnerefer ot eht elacs fo eht retemorcim
ot nihtiw f 0.05 .mm
A derrits diuqil bath ;0 ylmrofinu detaeh
,erusolcne ni hcihw eht nemiceps ,reirrac
4 TEST SPECIMEN
reht.egot htiw elbatsujda cirtcele gnitaeh ecruos
is ,decalp yb snaem fo hcihw eht nemiceps nac 4.1 ehT tset nemiceps shall eb ni eht mrof fo
eb deniatniam at eht derised ,serutarepmet htiw a pirts that syalpsid on tnerappa laitini
noitairav ni erutarepmet tuohguorht eht eguag ytiralugerri fo .erutavruc
htgnel fo eht nemiceps ton ot deecxe 0.5 4.2 ehT mumixam ssenkciht shall ton eb
tnecrep fo eht erutarepmet egnar desu ni eht retaerg than eht muminim ssenkciht yb erom
.tset than 2 tnecrep fo eht .retal
2
SI 2855 : 1991
4.3 ehT htdiw shall eb detaler ot eht ssenkciht ,revewoH erac shall eb otrdesicrexe evomer all
ni ecnadrocca htiw .giF 2. derreferP widths ria selbbub morf eht elpmas nehw gnihgiew ti
era ot eb desu revenehw .elbissop ehT -ixam ni retaw and ot diova eht ecneserp fo esaerg
mum htdiw shall ton deecxe eht muminim ro lio smlif no eht ecafrus fo eht .retaw oT
htdiw yb erom than 2 tnecrep fo eht .retal this dne ti is dednemmocer that retfa a -ilerp
yranim gninaelc ot evomer suoivbo ,trid eht
4.4 ehT htgnel shall eb hcus as ot wolla a
elpmas eb dehcatta ot a enif eriw ot eb desu
ecnatsid neewteb stroppus that sraeb eht
retal ni suspending ,ti elihw gnihgiew and
noitaler ot eht ssenkciht ni ecnadrocca htiw
ylhguorht ,desnir tsrif ,rehte’ni neht lohocla
elbaT 1 and ot wolla a ecnatsid dnoyeb eht
and yllanif ,retaw erofeb gnisremmi ni eht retaw
stroppus ton less than eht .htdiw
ot eb desu rof .gnihgiew
4.5 ehT ssenkciht fo eht nemiceps shall eb
denimreted nihtiw 100.0f mm yb snaem fo a 5 PREPARATION OF TEST SPECIMEN
wercs retemorcim ro an tnelaviuqe .dohtem
5.1 retfA gnieb ylhguor tuc ro deraehs morf
ETON - roF nemiceps ssel naht 1.27 mm ni -kciht eht ,elpmas hsinif eht tset nemiceps ot ezis yb
,ssen laiceps snoituacerp are ,yrassecen hcus as the luferac gninihcam ro .gnilif evomeR eht tnuoma
esu of a retemorcim gnidaer yltcerid ot 0401 mm or
fo lairetam gnidnetxe a ecnatsid ton less than
elbatius lacitpo sdohtem yam eb .desu
eciwt eht ssenkciht gnola hcae egde fo eht
ehT egareva ssenkciht yam osla eb -uclac ,nemiceps ot etanimile lairetam degamad yb
detal morf stnemerusaem fo ,htgnel ,htdiw yranimilerp shaping. tilS segde htiw a muminim
thgiew and .ytisned nehW eht ytisned is fo rrub yam osla eb .desu
,nwonknu ti yam eb denimreted yb gnihgiew a
elpmas fo at tsael 10 g tsrif ni ria and neht ni 5.2 nehW eht nemiceps has neeb dehsinif ot
.retaw ehT ytisned ni grams rep cibuc -itnec ,ezis ekam yna yrassecen ecnerefer marks ( yb
ertem is tnelaviuqe ot eht thgiew ni ria dedivid hcus snaem as a sharp ,llird gnibircs ,loot ro
yb eht ssol fo thgiew eud ot ecnegrembus ni gnillim rettuc ) and enimreted and drocer rieht
.retaw ehT erutarepmet fo eht retaw shall eb evitaler .snoitacol oD ton esu retnec sehcnup
yletamixorppa eht emas as that fo eht ecnalab ro ralimis snaem esuaceb fo eht noitrotsid
moor ot diova srorre eud ot noitcevnoc .decudorp
.stnerruc roP eht ycarucca ,deriuqer on
snoitcerroc era yrassecen rof eht erutarepmet 5.3 tI is dednemmocer that eht grains nur gnola
fo eht retaw ro rof eht ycnayoub fo eht .ria eht htgnel fo eht .nemiceps
16

6
,SSENKCIHT mm
.GIF 2 WIDTH OF TEST SPECIMEN
3
----r ._“..” ......_. _-.. ^.._ _.- .._-_.___~_ -~ -... II--
/6.7 retfA gnivah d=ruc:s yrotcafsitas -arepmet
TaMe 1 Gauge Length of Test Specimen
erut stnemerusaem and gnidnopserroc -celfed
( Method A- )
noit data, establish eht txen nesohc erutarepmet
( Clause 4.4 ) and wollof eht gnidecerp enituor revo eht egnar
fo erutarepmet deerga .nopu
Specimen Thickness Gauge Length
6.8 nI all ,sesac ekam a lanif tes fo -erusaem
.A-__.
Prom Up to and inchdin; stnem at ro raen moor erutarepmet ot -reted
mm m&n enim rehtehw ro ton ereht has neeb tnenamrep
noitrotsid ro yna lacinahcem tnedicni that
0.30 0.379 50.8 f 12.7
dluow tneverp noitanimreted fo ytivixelf nihtiw
0.38 0.509 63.5 f 12.7
eht derised stimil fo .ycarucca fI hcus is
0.51 0.639 76.2 -+ 12.7
,tnedive taeper eht tset rednu eno fo eht
0.64 0.759 88.9 f 12.7
gniwollof snoitidnoc as deerga nopu yb eht
0.76 0,889 101.6 f 12.7
rerutcafunam and eht :resahcrup
0.89 1.139 114.3 f 12.7
1.14 2.54 127.0 f 12.7 6.8.1 tseT eht emas nemiceps revo eht emas
erutarepmet .egnar
6 PROCEDURE
6.8.2 tseT eht emas nemiceps revo a tnereffid
6.1 Stabilization erutarepmet .egnar
After all yrotaraperp krow no eht tset nemiceps 6.8.3 tseT rehtona nemiceps revo eht emas
has neeb ,detelpmoc tcejbus ti ot a gnizilibats erutarepmet .egnar
taeh tnemtaert ot eveiler lanretni .sesserts sihT
tnemtaert yam tsisnoc ni gnitaeh eht nemiceps 6.8.4 tseT rehtona nemiceps revo a tnereffid
elihw eerf ot ,dneb rof a debircserp emit and erutarepmet .egnar
.erutarepmet ehT sliated fo eht gnizilibats
7
erudecorp lliw dneped nopu eht scitsiretcarahc CALCULATION
fo eht tatsomreht latem gnieb detset and shall roF eht noitalucl.ac ees 2.2.1 and xennA A.
eb as yllautum deerga nopu neewteb eht -unam
rerutcaf and eht .resahcrup 8 REPORT
ehT troper shall edulcni eht :gniwollof
6.2
Test Routine
)a epyT fo tatsomreht ;latem
tnuoM eht nemiceps no eht troppus no eht )b snoisnemiD fo ;nemiceps
nemiceps ,elbat tup eht noissimsnart dor ni
)c erutarepmeT and epyt fo gnizilibats taeh
ecalp and ekat a orez gnidaer at moor -arepmet
;tnemtaert
.erut ylppA slight lacinahcem erusserp and
neht evomer at a tniop raen eht rethec fo eht )d erutarepmeT egnar fo ;tset and
.nemiceps fI elbaicerppa ore tfihs is tnerappa )e .ytivixelP
htiw detaeper snoitacilppa fo ,erusserp -reted
enim eht esuac and tcerroc erofeb gnideecorp 9
PRECISION AND BIAS
htiw eht .tset
ehT evitalumuc srorre ni eht tnemerusaem fo
6.3 nehW yrotcafsitas laitini snoitidnoc evah evitca ,htgnel ,erutarepmet ,ssenkciht and
neeb ,dehsilbatse ekam snoitavresbo fo noitcelfed snoitisop nac ecudorp seicnapercsid
noitcelfed and erutarepmet at moor -arepmet neewteb evisseccus ytivixelf snoitanimreted no
erut and drocer eht .stluser eht emas tset .nemiceps selbaT 2 and 4 wohs
mumixam evitalumuc srorre using a lacitsitats
6.4 nehT adjust eht erutarepmet fo eht hcaorppa rof suoirav elpmas ,ezis ,seitivixelf
nemiceps ot eht txen eulav .derised erusaeM and erutarepmet secnereffid ( TA .)
and drocer eht erutarepmet fo eht nemiceps at
stniop no ro raen eht retnec and .sdne METHOD B - SPIRAL COILS
6.5 nehT erusaem and drocer eht .noitcelfed
10 APPARATUS
6.6 erusaemeR and drocer eht erutarepmet
10.1 Specimen Carrier/Holder
stnemerusaem as debircsed ni 6.4. fI tnacifingis
seicnapercsid fo erutarepmet ro its noitubirtsid tI shall edivorp snaem rof yleruces gnidloh eht
era ,dnuof tcerroc meht and again erusaem .lioc tI shall eb ylbareferp ralucric ssorc
and drocer eht .noitcelfed noitces esohw retemaid shall eb as egral as
4
sl 5582 : 1991
Table 2 Maximum Cumulative Ferrous in Flexjvity Determination of*Flat Strips (Method A )
( Item 9 )
Flexfvity t Q Maximum Error in Flexivity f %
t *--- ----B
A T== AT= A T=
mm/mm”C mm mm 555°C lll@c 166.5oC
43 x104 2.54 1279 0.82 044 0.32
.
43 2.29 127.0 0.80 0.43 0.32
43 2.03 127;0 0.79 0.43 0.32
43 1 a78 127.0 0.78 043 0.32
43 l-52 127.0 a.78 0.43 0.34
43 1a 27 127.0 0.77 044 0.35
43 1.02 114.3 0.79 0.47 0.38
43 0.76 101.6 0.82 0.52 0.45
43 0.51 76.2 0.92. 0.66 0.61
43 O-38 63.5 1.04 0.81 0.77
43 0.30 50.8 1.18 0.98 094
32. 2.54 127.0 1.01 0.52 0.31
23 2.29 127-O 0.96 0.50 0.36
23 2.03 127-O 0.92 0.49 0.36
23 l-78 127.0 0.88 0.47 0.35
23 1.52 127.0 0.85 0.47 0.36
23. 1.27 127.0 0.83 0.46 0.36
23 1.02 114.3 0.84 0.49 040
23 O-76 101a 6 O-87 0.54 0.46
23 o-51 76-2. 0.98 0.68 0.62
23 0.38 63.5 1.10 0.83 0.77
23 0.30 50.8 1.26 1:Oa 0.95
13 2.54 127.0 1.48 0.76 0.52
13 2.29 127- 0. 1.37 0.70 0.49
13 2.03 127.0 1.27 0.65 0.46
13 1.78 127-O 1.17 0.61 0.43
13 1.52 127-O 1.07 0.57 0.42

13 1.27 127-O 0.99 0.54 040

13 l-02 114.3 l*OO 0.56 0.43
13 (r-76 101.6 l?OO 0.60 0.49
13 O-51 76-2 1.15 0.75 0.65
13 O-38 63.5 1.28 0.89 0‘80
13 0.30 58.8 1.50 1.09 0.99
4 2.54 127-O 4.58 2.30 1.54
4 2.29 127-O 4.14 2.07 1.39
4 2.03 127.0 3 -69 1.85 1.24
4 1.78 127.0 3825 1.64 l-10
4 l-52 127.0 2.81 1.42 0.96
4 1.27 127.0 2.38 1.21 0.83
4 l-02 114.3 2.36 1.21 O-84
4 0.76 101.6 2.27 l-18 o-84
4 0.51 76.2 2.66 1.41 1.03
4 0.38 63.5 2.90 1.58 1.18
4 0.30 50.8 360 1.95 1.47