版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請進(jìn)行舉報(bào)或認(rèn)領(lǐng)
文檔簡介
1、Designation:D6992?03(Reapproved2015)StardTestMethodfAcceleratedTensileCreepCreepRuptureofGeosyntheticMaterialsBasedonTimeTemperatureSuperpositionUsingtheSteppedIsothermalMethod1ThisstardisissuedunderthefixeddesignationD6
2、992thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethel
3、astrevisionreapproval.1.Scope1.1ThistestmethodcoversacceleratedtestingftensilecreeptensilecreeprupturepropertiesusingtheSteppedIsothermalMethod(SIM).1.2Thetestmethodisfocusedongeosyntheticreinfcementmaterialssuchasyarnsr
4、ibsofgeogridsnarrowgeotextilespecimens.1.3TheSIMtestsarelaterallyunconfinedtestsbasedontimetemperaturesuperpositionprocedures.1.4TensiletestsaretobecompletedbefeSIMteststheresultsareusedtodeterminethestresslevelsfsubsequ
5、entSIMtestsdefinedintermsofthepercentageofUltimateTensileStrength(TULT).AdditionallythetensiletestcanbedesignedtoprovideestimatesoftheinitialelasticstraindistributionsappropriateftheSIMresults.1.5RampHold(RH)testsmaybeco
6、mpletedinconjunctionwithSIMtests.TheyaredesignedtoprovideadditionalestimatesoftheinitialelasticinitialrapidcreepstrainlevelsappropriateftheSIMresults.1.6Thismethodcanbeusedtoestablishthesustainedloadcreepcreepruptureacte
7、risticsofageosynthetic.ResultsofthismethodaretobeusedtoaugmentresultsofTestMethodD5262maynotbeusedasthesolebasisfdeterminationoflongtermcreepcreeprupturebehaviofgeosyntheticmaterial.1.7ThevaluesstatedinSIunitsaretoberega
8、rdedasstard.Nootherunitsofmeasurementareincludedinthisstard.1.8Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthprac
9、ticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D2990TestMethodsfTensileCompressiveFlexuralCreepCreepRuptureofPlasticsD4439TerminologyfGeosyntheticsD4595TestMethodfTensileP
10、ropertiesofGeotextilesbytheWideWidthStripMethodD5262TestMethodfEvaluatingtheUnconfinedTensionCreepCreepRuptureBehaviofGeosynthetics3.Terminology3.1FdefinitionsrelatedtogeosyntheticsseeTerminologyD4439.3.2Fdefinitionsrela
11、tedtocreepseeTestMethodsD2990D5262.3.3DefinitionsofTermsSpecifictoThisStard:3.3.1creepmodulus—inSIManalysistheloaddividedbythepercentstrainatanygivenpointintime.3.3.2dwelltime—timeduringwhichconditions(particularload)are
12、heldconstantbetweentemperaturesteps.3.3.3meantesttemperature—thearithmeticaverageofalltemperaturereadingsoftheatmospheresurroundingthetestspecimenfaparticulartemperaturestepstartingatatimenotlaterthanestablishedtemperatu
13、reramptimefinishingatatimejustpritothesubsequenttemperaturereset.3.3.4offsetmodulusmethodpointing—dataanalysismethodusedtonmalizeanyprestraininthesamplesbyshiftingtheiginofastressversusstraincurvetoanaxisiginofcodinatest
14、hatistocodinates(00).3.3.5ramphold(RH)test—acreeptestofveryshtdurationfexample100to1000s.1ThistestmethodisunderthejurisdictionofASTMCommitteeD35onGeosyntheticsisthedirectresponsibilityofSubcommitteeD35.02onEndurancePrope
15、rties.CurrenteditionapprovedMay12015.PublishedJune2015.iginallyapprovedin2003.Lastpreviouseditionapprovedin2009asD6992–03(2009).DOI:10.1520D699203R15.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomer
16、Serviceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1ofthematerial.Howevercrela
17、tionbetweennarrowgeotextilestripssinglegeogridribstowiderrepresentativespecimensshouldbeestablished.8.4Thelengthofthetestspecimenisdeterminedbythetypeofgripused.Refertospecifictensiletestprocedurefguidance.8.5NumberofTes
18、ts:8.5.1AsinglespecimenisusuallysufficienttodefineamastercreeprelaxationcurveusingtheSIM.HoweverifonlyasingleSIMtestistobeperfmedthelocationoftheonsetofcreepstrainmoduluscurveshouldbeconfirmedusingatleasttwoshttermcreep(
19、RH)tests.8.5.2Generally12to18specimensareneededtodefineastressrupturecurverepresentingmultiplerupturetimes.FewerspecimenswouldbeneededtodefineaspecificregionofthecurvefexamplethepercentTULTat1106h(=110year)rupturelife.9.
20、Conditioning9.1TensileSIMtestingshallbeconductedusing2061Casthereferencetemperaturestard.Ifthelabatyisnotwithinthisrangeperfmtensiletestsinasuitableenvironmentalchambercapableofcontrolledcoolingheating.Theenvironmentalch
21、ambershouldhaveaprogrammablesetpointcontrollersoastomaintaintemperatureto2061C.Whenagreedtoareferencetemperatureotherthan20Ccanbeutilized.Alsowhenagreedtotheresultsoftestingunderthisstardcanbeshiftedfromonereferencetempe
22、raturetoanother.9.2Allowthespecimenadequatetimetocometotemperatureequilibriuminthelabatyenvironmentalchamber.Generallythiscanbeaccomplishedwithinafewhours(seeNote3).9.3Recdtherelativehuityinthelabatyenvironmentalchamberf
23、alltests.10.ionofTestConditions10.1Thestardenvironmentftestingisdrysincetheeffectofelevatedtemperatureistoreducethehuityofambientairwithoutspecialcontrols.10.2Thestardreferencetemperatureis20Cunlessotherwiseagreedto.Thei
24、ndividualreferencetemperaturefeachSIMtestistheaverageachievedtemperatureofthefirstisothermaldwell.10.3Testingtemperaturesaretobewithin62Cofthetargettesttemperatures.Itiscriticallyimptantthatthetestspecimenhasequilibrated
25、throughoutitsthicknesssoastoavoidnonisothermalconditions.Initialtrialsarenecessarytoestablishthisminimumequilibriumtime.NOTE3—Labatyexperiencehassuggestedthattheuseofcalibratedthermocoupleslocatednearaffixedtoembeddedwit
26、hinthetestspecimenmayfacilitateasuccessfultemperaturecompliancetestfthespecimenmaterial.ItissuggestedthatthelabatyperfmtheplannedSIMtemperaturestepsusinganunloadedsacrificialtestspecimenwiththeuseofthesethermocouplesmeas
27、urethetemperaturechangeofthespecimenatitsthickestmostmassdenseregion.Thetimerequiredfthespecimentoreachthetargettemperatureisrecdedusedastheminimumdwelltime.Theupperlimitofthetemperatureramptimeisnotknown.Successfultests
28、withsomematerialshavebeenrunwithtemperatureramptimesofuptofourminutes.10.4Testtemperaturesaretobemaintainedwithin61.0Cofthemeanachievedtemperature.10.4.1Temperaturestepsdwelltimesmustbesuchthatthesteadystatecreeprateatth
29、ebeginningofanewstepisnotsodifferentfromthatofthepreviousthatitcannotbeestablishedwithintheidentifiedramptime.11.Procedures11.1ThesamesimilarloadstraincontrolshallbeappliedtothetensileteststheloadrampptionofRHSIM(creepcr
30、eeprupture)tests.Theloadratecontrol(inunitsofkNpermin)thatisappliedshallachieveanarrowrangeofstrainratesexpressedinpercentperminuteasagreedupon.Generally1063%permin(2063%perminfEuropeanpractice)willbesatisfacty.NOTE4—Ali
31、nearrampofloadversustimewillnotgenerallyresultinalinearstrainversustimerelationshipbecausestressversusstraincurvesarenotlinearfmostgeosyntheticmaterials.11.2AchievethetestloadsfRHSIMtestswithin62%ofthetargetloadsmaintain
32、anyachievedloadwithin60.5%ofitsvaluesfthedurationofthetest.Abriefovershootofthetargetloadthatiswithin62%ofthetargetloadlimitedtoa1to2stimedurationisacceptablefloadcontrolsystems.11.3ReplicatetestloadsfRHSIMtestsshouldbew
33、ithin60.5%oftheaverageoftheachievedloadsfatestset.11.4Pretensioningupinaccdancewiththegoverningtensiletestisacceptable.Themethodusedtodefinezerostrainistobeidentifiedrepted.11.5ThesamesimilargripsshallbeusedftensileRHSIM
34、tests.Careshouldbetakentousegripsthatdonotinitiatefailureincurslippageatstresslevelswhichmayproducespecimenrupture(fexampleatloadsgreaterthan55%ofTULTfpolyester).11.6Inspectgripstoinsureloadingsurfacesarecleanthatpadding
35、ifusedisfreeofdefectsissecuredproperly.11.7Inspectthespecimeninstallationtobesurethematerialisproperlyalignedwiththegripswiththeloadingaxis.11.8Insurethattheloadcellusediscalibratedproperlysuchthatitwillaccuratelymeasure
36、therangeoftensileloadsanticipated.11.9Insurethattheextensometerused(ifany)iscalibratedproperlysuchthatitwillaccuratelymeasuretherangeoftensilestrainsanticipated.Ifruptureisanticipatedtakeprecautionstoinsurethattherupture
37、eventwillnotdamagetheextensometercreateahazardfthemachineoperat.11.10Unlessotherwiseagreedupona100mmgaugelengthshallbeusedfgeosyntheticproductsa250to300mmgaugelengthshallbeusedfprecursyamproducts.11.11Timeloadextensionda
溫馨提示
- 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 眾賞文庫僅提供信息存儲(chǔ)空間,僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。
最新文檔
- 【astm標(biāo)準(zhǔn)】d 950 - 03 (2011)
- 【astm標(biāo)準(zhǔn)】d 3336 - 05 (2015)
- 【astm標(biāo)準(zhǔn)】d 5170 - 98 (2015)
- 【astm標(biāo)準(zhǔn)】d 2095 - 96 (2015)
- 【astm標(biāo)準(zhǔn)】d 4784 - 93 (2015)
- 【astm標(biāo)準(zhǔn)】d 3964 - 10 (2015)
- 【astm標(biāo)準(zhǔn)】d 5112 - 98 (2015)
- 【astm標(biāo)準(zhǔn)】d 1155 - 10 (2015)
- 【astm標(biāo)準(zhǔn)】d 1777 - 96 (2015)
- 【astm標(biāo)準(zhǔn)】d 4003 - 98 (2015)
- 【astm標(biāo)準(zhǔn)】d 7228 - 06a (2015)
- 【astm標(biāo)準(zhǔn)】d 1434 - 82 (2015)e1
- 【astm標(biāo)準(zhǔn)】d 4679 - 02 (2015)e1
- 【astm標(biāo)準(zhǔn)】a 363 - 03 (2014)
- 【astm標(biāo)準(zhǔn)】d 7310 - 11
- 【astm標(biāo)準(zhǔn)】d 5778 - 12
- 【astm標(biāo)準(zhǔn)】d 7976 - 14
- 【astm標(biāo)準(zhǔn)】d 2200 - 13
- 【astm標(biāo)準(zhǔn)】d 6691 - 09
- 【astm標(biāo)準(zhǔn)】d 6132 - 13
評論
0/150
提交評論