粘彈性材料動態(tài)擴展裂尖場及載荷參數(shù)研究.pdf

1、分類號：——UDC：工學碩士學位論文密級：——編號：粘彈性材料動態(tài)擴展裂尖場及載荷參數(shù)研究碩士研究生指導教師學位級別學科、專業(yè)所在單位論文提交日期論文答辯日期學位授予單位：邊科：唐立強教授：工學碩士：固體力學：建筑工程學院：2007年5月：2007年6月：哈爾濱工程大學哈爾濱工程大學碩士學佗論文ABSTRACTAstudyonthefieldofdynamicpropagatingcracktiphasvitalsignificance

2、tothematerialfracturedestructionresearchwhilethetime—dependentmechanicalpropertiesofmaterialhavetremendousinfluenceontherigidity，theintensityandtheservicelifeofthestructureAtthesimetimetheapplicationofloadparameterofthec

3、racktipisextremelywidespreadincharactizingthecracktippropertiesBasedonthese，thisarticlestudiedtheproblemsofdynamicpropagatingcrackintheviscoelasticmaterial，whichhastimedependentdeformationcharacteristicThedynamicpropagat

4、ingcrackinincompressibleviscoelasticmaterialisdetailedlystudiedundertheplanestrainconditionfirstlyEmbarkingfromthefundamentalequationcombiningwiththeanalysisonthesingularityofcracktipfields，theasymptoticgoverningequation

5、sarededucedWithsoluting—deteriminingconditions，thestress，strainanddisplacementfieldsnearthetipofmodeIandIIcrackareobtainedbyusingtheshootingmethod，ThelawsofcracktipfieldsalongwithvariationaleachparameteraredisussedBycomp

6、aringwithotherresults，theaccuracyoftheobtainedoutcomeisdemonstratedSecondlythedynamicpropagatingcracktipfieldsincompressibleviscoelasticmaterialformodeIandIIarestudiedwhiletheanalysisissimilartothefirststepTherulesoffiel

7、dsalongwithparmetersaredebatedalsoWhenthePoisson’sratiol，isequaltoO5theresultscartcompletelydegeneratetothoseinincompressiblesituationsothevalidityoftheresultsincompressiblesituationisverifiedFinallyforthecracktiploadpar

8、ameterC’integral，byitsdefinitionandtheanalysisofsingularitythepathdependentpropertiesareinvestigated；Usingthecracktipfieldsinincompressiblesituation，theregularityofC’Callbereflectedbyasolvablevalue4，accordinglythevariati