8-Summarization and Review

《8-Summarization and Review》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、SummarizationandReview(总结与复习)Maincontains：Introduction（featuresofelasticandplasticdeformation；basichypotheses）StressandstrainanalysisElasticmechanics(542)PlasticmechanicsFracturemechanicsSummarizationandReviewFeaturesofelasticandplasticdeformationdifferences：

2、invertibility(可逆性):e——invertible;p——un-invertible;relationwithloadinghistory:e——irrelevant;p——relevant;stress-strainequation:e——linear;p——non-linear;effectsonthestructureandproperties:e——littleeffect;p——greateffect;deformationmechanism:e——displacement

3、ofatoms;p——movementofdislocations;relationship：①quantitativechange→qualitativechange（forductilematerials）②co-existenceofelasticandplasticdeformationindeformedmaterial;andco-existenceofelasticdeformationoftoolsanddiesandplasticdeformationofas-deformedpartsinpl

4、asticprocessingSummarizationandReviewStressanalysis1．Pointstressstate:①definition；②description（threemethods:algebraic,tensor,figure）；symbolsforpositiveandnegative③decomposition：significance、method（）、figure2．Specialstresses：①principalstressphysicalmeaning:norma

5、lstressesatprincipalplanes（100）resolutionmethods:SummarizationandReview②Principalshearstresses（110）andmaximumshearstress：③Octahedralstresses（111）:solution？significance？SummarizationandReview④equivalentstress：meaning?resolution？⑤Hydrostaticstress(静水压力)：Itmayres

6、ultinvolumeexpansionalone,hasnothingtodowithplasticdeformationandcanrestrainthepropagationofcracks.SummarizationandReviewForplasticdeformation:ThemeaningofI1,I2’andI3’I1:expressesthedegreeofvolumedeformation(elastic);I2’:expressesthedegreeofshapedeformation(pl

7、astic);I3’:acriterionforthetypeofplasticdeformation：=0：DⅡ：planedeformation，e.g.thinsheetrolling>0：DⅢ：stretchdeformation，e.g.extrusion,drawing<0：DⅠ：compressiondeformation，e.g.forging,rollingSummarizationandReviewStrainanalysisPointstrainstate:definition,descrip

8、tion,decompositionengineeringstrains：truestrains:symbolsforpositiveandnegativeSimilaritiesanddifferencesofstressandstrainanalysisdefinition,description,decomposition,relationship,e