含残余应力x70钢与接头ctod设计曲线应用分析

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1、武汉理工大学硕士学位论文thismethodisbasedonBS7910-2005(Guidetomethodsforassessingtheacceptabilityofflawsinmetallicstructures)specificationsof2classaratingcurveisdeducedanewCTODdesigncurve,named"BS79102A-CTODdesigncurve;TheCTODdesigncurveissuitableforelastoplasticrangeandmechanicalpropertiesofheterogeneouswelded

2、joint,basedonthecurveofCTODdesigntypeIthroughthecracklengththresholdformulaarederived,thismethodbreaksthroughthetraditionalcomputingthroughthecracklengththresholdislimitedtotheshortageoftheelasticstage,butalsoconsiderstheweldingandtheresidualstressofthematerialfracturetoughnessontheinfluenceofcracks

3、tructuresafetyperformance.2)byadoptingthetechnologyofcelldeath,thecombinationofCTODdefinition,directcalculatingthecriticalCTODvaluematerials.Andwilltestthematerialfracturetoughness(thecriticalvalueofCTOD)comparedwiththeresultsofANSYSnumericalanalysis.3)usingtheANSYSsoftware,theestablishmentofX70pipe

4、linesteelVgrooveANSYSmodeloftemperaturefieldofX70steelplateandjointandweldingresidualstressfieldcalculationandanalysisinturn.4)analysisBS79102A-CTODdesigncurvederivedthecalculationofmodeIcracklengthformulaofthecriticalvalue,theformulatotheweldingresidualstress,fracturetoughnessandtypeIthroughcrackle

5、ngthtotherelationsbetweenthecriticalvalue,usingtheMATLABsoftwaretomapthesurfaceofrelationshipbetweenthem,inordertodirectobservation.5)usingANSYStocalculatetheX70steelafterweldingresidualstressdistribution,undertheconditionofthecontainingweldingresidualstressisobtained,throughthemodeIcracklengththres

6、holdnumericalsizedistributionalongthelengthdirectioncomponent.UsingTheBS7910-CTODdesigncurvetodetermingthethecriticalvalueofcracklengthofX70steelandweldedisscientificandserious,itiscanbeusedforreferenceofpressurevesselsandpipingproductionandresearchenterprise.KeyWords:weldingresidualstress;CTODdesig

7、ncurve;X70Steel;weldedjointIV万方数据武汉理工大学硕士学位论文目录摘要.....................................................................................................................IAbstract.........................