ML20100P794
| ML20100P794 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 09/10/1984 |
| From: | Opar T, Walton C IRON CASTINGS SOCIETY, INC. |
| To: | |
| References | |
| OL-A-P-028, OL-A-P-28, NUDOCS 8412140435 | |
| Download: ML20100P794 (3) | |
Text
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I r IronCastig l
Handbook lt i
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Covering data on Gray, N
g Malleable, Ductile, White, Alloy and Compacted Graphite Irons l
Niteel by
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Charles F. Walton
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344 / MECHAfGCAL PROPERTIES OF DUCIEE NtON h0ECHAfeCAL MOOPERTeES OF DUCistE ut0M / 348 l
275-R 3l 1e
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0750*
O 4 e 7-047)*
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I T=e of these shscado era ensch suissene cessings heed T
the cal >ower engine caen in proper reiseson to the Unnnkha,g see m
Iruch trasne This redosagn trone a conipses wektod o-a te g
steel fabrication resusted in reduced cases. and O
e iniproved serength and teeigue characterestics.
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mental to fatigue hic but the sgred of the loading cycle arul the occur.
Tees====arh=a te U
rence of rest periods are not significasil.
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"' and nascised lahgue propenses As the saiasianussi stress is redinent. Ile stuenlet of cycles necessiary ise to peculuce a failure lecosnes much larger. Ihc highest stress at which ihe number of cycles for failure apprnacles inlinily Igenceally in caress sa
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. is sas se,engen
. ss. coo pu of ten millson cyclesi is callnl the catturneur limit. 'lhe emlur.inty VNokhmt.
0 25 nim Roos Red I
hePs rafias is lir relatiosa letween the esuherance lessait asul the tensile strength. Most of the data on fatigue strengtle lusvc licen oldnined 17.1
'*h' I '#-
,s.4 8 and she nokh seasshway with the rotating beam type test where the masimum stress alternates between tension asul compression. A typical S-N curve em which the stress is pledted against the number c4 cycles to failiere'* is simwn in Fig.13. Frewn these results, thc unnotched endurance limit is indicaint to F W1.titN) psi 18533 MPa). 'lhis is the snanimum stress at which n I4 f ailure siwmid sud occur under similar coewlitirwis in any munter
. ~ ces. Since this particular ductile iron has a tensile strcunth of gen,ae si,, upe see see nie ese i.ee
. 3ee fWl.SINI psi 1472 MPa) its crukerance ratio is 11.41.
'the efIcet of siress raisers on Ihe esulurance limit has licen evahiated
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lay the use of notched test luars. For this purgwne, a teotch is e:5: sally
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- testned into the circumfercewe ed an overtire har so that the lxase of rembc y k,
Poenbe.c a
the notch leaves a crms-sectices eqisal to the regular tennedched luers j
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to which ;Se notched hars are comparNI. The ratio of the unnotchal
.g q
to the r>>tched erwhatance lisnit is tersted lle notch sendtivity factor 5 **
= '
rg ie or the dynamic stress coincentratiosa f. actor. Several investigations have I
e Temeered Martensase Tsie emance roeies for obt'ained endistance ratios of frrun..Tl to.52 for lie different tyIrs E
- d N
of ductile iron. 'Ihc esuluraswc limit increases with tennic strength.
Imt as with other ferrous nwtah, the increase is less than pro lmetional.
eo iicrosuucture..
'the relation het wecn Irmile strength and tir emluraswc ratio is differ.
j cast for lle asincalcel. ferretic irons thast for the irents wille a anattis I
na inn e4.
is.o of peaslate or trenpore d snariestssic" 8". Fig.14.
Iemese Sarameth 1000swa l
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