1.Dab tsi yog cov ntsiab lus tseem ceeb?
Raw Materials vs. Cheebtsam: Txias-rolled steel coils yog hom khoom siv raw. Lawv cov chaw tsim khoom cov qauv (xws li GB / T, ISO, JIS, ASTM, thiab lwm yam) feem ntau qhia lawv cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab (yield zog, tensile zog, elongation), qhov ntev ntev, thiab qhov zoo. Cov no yog cov cuab yeej "static" yooj yim.
Fatigue Strength: Qhov no yog lub peev xwm ntawm cov khoom siv lossis cov qauv los tiv thaiv kev pib tawg thiab nthuav tawm hauv kev hloov pauv. Nws yog ib qho mob hnyav heev - cov cuab yeej rhiab heev, nyob ntawm:
Lub geometry ntawm cov khoom nws tus kheej (kev ntxhov siab concentration, xws li notches, qhov, cov kauj ruam).
Deg mob (roughness, residual stress, muaj ib tug decarburized txheej).
Load hom (bending, torsion, nro / compression) thiab load spectrum (kev nyuaj siab amplitude, txhais tau tias kev ntxhov siab, pes tsawg lub voj voog).
Qhov chaw ua haujlwm (kub, corrosive media).
Cov txheej txheem tsim khoom (kev ntxhov siab lossis kev puas tsuaj me me qhia los ntawm stamping, vuam, kho cua sov).
2.Dab tsi yog cov ntsiab lus tseem ceeb hauv cov qauv raw khoom?
Txawm hais tias qaug zog lub zog tsis ncaj qha, cov qauv ntawm cov khoom siv raw ua rau lub hauv paus ntawm kev qaug zog tsim. Cov qib siab zog ntawm cov ntaub ntawv feem ntau muaj peev xwm ua rau qaug zog ntau dua. Common cold-rolled coil (daim ntawv) cov qauv suav nrog:
Suav National Standards (GB/T):
GB/T 5213 Txias- dov qis- carbon steel ntawv thiab sawb
GB/T 710 High- zoo carbon structural steel kub- dov nyias daim ntawv thiab sawb (ib nrab npog txias dov)
GB/T 13237 Siab- zoo carbon structural steel txias- dov nyias daim ntawv thiab sawb
Cov qauv no feem ntau hais txog cov khoom siv kho tshuab thiab thev naus laus zis ntawm qib steel (xws li DC01, DC04, DC06; lossis 08Al, SPCC, SPCD, SPCE, thiab lwm yam).
Feem ntau Siv International / Industry Standards:
TS EN ISO 3574 Kev lag luam thiab qib stamping kub tsis tu ncua -Dip Galvanized Carbon Steel Sheet"
JIS G 3141 "Cold-Rolled Carbon Steel Sheet thiab Sawb" (SPCC/SPCD/SPCE, thiab lwm yam)
ASTM A1008 / A1008M "Standard Specification for Cold-Rolled, Carbon Steel, Qauv Qib Sheet Steel"
3.Dab tsi yog cov qauv tsim rau kev qaug zog thiab kev sim?
Fatigue Test Methods Standards:
GB/T 3075 * Cov khoom siv hlau- Kev sim qaug zog -Axial quab yuam txoj kev tswj *
TS EN ISO 1099 * Cov ntaub ntawv hlau{1}}Kev sim qaug zog-Axial quab yuam txoj kev tswj hwm *
ASTM E466 *Txoj Cai Ua Haujlwm rau Lub Zog-Controlled Constant Amplitude Axial Fatigue Testing of Metallic Materials*
Cov qauv no qhia txog yuav ua li cas npaj cov qauv thiab ua cov kev sim kom tau txais cov khoom siv S-N nkhaus (kev nyuaj siab- lub neej nkhaus).
Component Fatigue Design and Evaluation Standards:
Kev lag luam- cov qauv tshwj xeeb yog qhov tseem ceeb. Piv txwv li:
Kev lag luam tsheb: Txhua lub tuam txhab tsheb muaj nws cov qauv kev lag luam thiab dav siv SAE (Society of Automotive Engineers), FKM (German Research Council on Mechanical Engineering) cov lus qhia, thiab lwm yam.
Kev Lag Luam Mechanical: Hais txog GB / T 24176 / ISO 12107 * Cov khoom siv hlau- Kev ntsuas qaug zog - Cov txheej txheem txheeb cais thiab cov kev ntsuas ntsuas rau cov ntaub ntawv *.
Welded Structures: Hais txog IIW (International Institute of Welding) pom zoo cov lus qhia tshwj xeeb, uas muab cov qib tsim kev qaug zog (FAT qib) rau ntau hom welded pob qij txha.
4.Yuav ua li cas kom tau txais / txiav txim siab qaug zog ntawm ib feem ua los ntawm ib qho txias txias -rolled coil?
Kev kwv yees los ntawm cov khoom siv yooj yim:
Rau cov hlau, ib qho kev sib raug zoo ntawm kev sib raug zoo yog: Kev sib hloov bending qaug zog txwv (rau cov qauv du) ≈ (0.4 ~ 0.6) × tensile lub zog.
Qhov no yog qhov pib xwb. Lub zog qaug zog ntawm qhov tseeb tuaj yeem txo qis vim muaj ntau yam uas tau hais los saum toj no (tshwj xeeb yog kev ntxhov siab), qee zaum tsuas yog 30% lossis tsawg dua ntawm qhov kwv yees no.
Kev sim nrog qhov tseeb:
Qhov no yog txoj kev ntseeg siab tshaj plaws. Qhov tseeb lossis cov qauv ntsuas 1: 1 raug kuaj ntawm lub tshuab kuaj qaug zog raws li cov qauv ntsuas cuam tshuam kom txog rau thaum tau txais S-N nkhaus. Qhov no yog tus qauv kev coj ua hauv kev nyab xeeb- kev lag luam tseem ceeb xws li tsheb thiab aerospace.
Tsim raws li tus qauv databases:
Cov qauv tsim yog tsim los ntawm kev siv uas twb muaj lawm, muaj nyob rau hauv pej xeem, lossis kev lag luam - cov khoom tshwj xeeb S-N nkhaus databases thiab qib qaug zog (FAT) qhov tseem ceeb rau cov ntsiab lus sib koom ua ke. Piv txwv li, Eurocode 3 (European steel qauv tsim code) muab kev qaug zog rau kev faib ua feem rau ntau yam qauv.
5.Hais txog koj cov lus nug, "Dab tsi yog cov lus pom zoo rau kev qaug zog cov qauv rau txias-rolled coils?"
Tsis muaj kev sib koom ua ke rau cov khoom tsim tawm. Cov qauv rau cov khaub thuas- dov coils tsuas yog muab cov khoom siv tshuab thiab tshuaj lom neeg yooj yim.
Fatigue zog yog ib tug systemic cwj pwm txiav txim los ntawm "khoom siv + ib feem tsim + manufacturing txheej txheem + siv tej yam kev mob".
Yuav kom tau txais cov ntaub ntawv ntseeg tau, koj yuav tsum:
Txhais daim ntawv thov scenario (qhov twg? Nws siv qhov twg? Dab tsi yog qhov load?).
Txiav txim siab cov khoom siv tshwj xeeb (xws li HC340/590DP, SPCC, thiab lwm yam).
Ua qhov kev ntsuam xyuas lub cev qaug zog (txoj kev ntseeg siab tshaj plaws), lossis xa mus rau cov qauv tsim kev lag luam thiab cov ntaub ntawv rau kev kwv yees.