T型接頭焊接溫度場與應(yīng)力場的數(shù)值仿真.pdf

1、（分類號:學(xué)校代碼:10128分類號:學(xué)校代碼:10128UDC:學(xué)號:20071239學(xué)號:20071239碩士學(xué)位論文碩士學(xué)位論文二○一○年六月二○一○年六月類別：全日制碩士研究生別：全日制碩士研究生題目：T型接頭焊接溫度場與應(yīng)力場的數(shù)值仿真英文題目：目：T型接頭焊接溫度場與應(yīng)力場的數(shù)值仿真英文題目：NumericalSimulationofWeldingTemperatureFieldandStressFieldofTjoint研

2、究生：德亞莎研究生：德亞莎學(xué)科專業(yè)：材料加工工程學(xué)科專業(yè)：材料加工工程指導(dǎo)教師：董俊慧指導(dǎo)教師：董俊慧教授教授AbstractWeldingprocessisthatpartsofanareaisquicklyheatedtohightemperaturethenrapidlycooled.Withtheheatsourcemovingthewholeweldment’stemperaturesharplychangesthemater

3、ial’sphysicalpropertyparametersalsosharplychange.Atthesametimethereislatentheatofmeltphasechange.Therefetheanalysisofweldingtemperaturefieldisatypicalnonlineartransientheatconductionproblem.Becauseofnonunifmtemperaturedi

4、stributionatthecourseofweldingpostweldweldmenttakesonseriousweldingstressdefmation.Calculationofweldingstressdefmationincludesgeometricalnonlinearproblemmaterialnonlinearproblem.ThispaperfocusesonnumericalsimulationofTjo

5、intweldinginweldinginweldingtemperaturefieldstressdefmationbyfinitedementsoftwareANSYSbasedonthetheyofthermalelasticplastic.Theweldingtemperatureatanytimeisobtained.Thestressduringweldingtheresidualstressareobtained.Foll

6、owingcontentsareincludedinthispaper:1.ThreedimensionedmodelofTjointisdevelopedtosimulateweldingtemperaturefieldstressdefmation.Indertosolvetheproblemimprovesolutionaccuracythispaperchoosessuitablematerialpropertyparamete

7、rusestransitionmeshtoensureithasafinegridintheweldingzonechoosessuitabletimestep.Itusesthemethodof“birthdeath”methodtosimulatetemperaturefieldinthemovingheatsource.2.Weldingtemperaturefieldstressstrainfieldarebidirection

8、alcouplebuttheinfluenceofstressstrainfieldontemperatureislittlethecalculatingabilityofcomputerislimitedsothispaperonlyconsidersthesinglecouplewhichtemperaturefieldeffectsonstressstrainfieldsavetheresultthenusethetemperat

9、ureresultasloadtocalculateweldingstressdefmation.Thenthetemperaturefieldwereintroducedtodoelasticanalysis.3.Thecalculationresultsoftemperaturefield:Analyzeseveralkeythermalcyclingcurveaccdswiththeweldingprocesstemperatur

10、evariationthemaximumtemperatureofbuttweldjointsreached2020degrees.ThemaximumtemperatureofTjointreached1994degrees.Analyzetheweldingtemperaturefieldatdifferenttime.Theweldingtemperaturefieldisbasicallyaccdwiththeeticalres