英汉双语材料力学1.ppt

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1、CHAPTER1AXIALTENSIONANDCOMPRESSIONMechanicsofMaterials112材料力学第一章轴向拉伸和压缩2CHAPTER1AXIALTENSIONANDCOMPRESSION§1–1Conceptsandpracticalexamplesofaxialtensionandcompression§1–2Internalforce、methodofsection、axialforceanditsdiagram§1–3Stressesonthesectionandstrengthconditions§1-4Deformationoftherodina

2、xialtensionandcompressionlawofelasticity§1-5Elasticstrainenergyoftherodinaxialtensionandcompression§1-6Staticallyindeterminateproblemsandtheirtreatmentmethodsofaxialtensionandcompression§1-7Mechanicalpropertiesofmaterialsinaxialtensionandcompression33§1–1轴向拉压的概念及实例§1–2内力、截面法、轴力及轴力图§1–3截面上的应力及

3、强度条件第一章轴向拉伸和压缩§1-4拉压杆的变形弹性定律§1-5拉压杆的弹性应变能§1-6拉压超静定问题及其处理方法§1-7材料在拉伸和压缩时的力学性能4§1–1CONCEPTSANDPRACTICALEXAMPLESOFAXIALTENSIONANDCOMPRESSIONCharacteristicoftheexternalforce：Theactinglineoftheresultantofexternalforcesiscoincidedwiththeaxisoftherod.1、ConceptsCharacteristicofthedeformation：Deformat

4、ionoftherodismainlyelongationorcontractionalongtheaxisoftherodandcompaniedwithlateralreductionorenlargement.Axialtension：Deformationoftherodisaxialelongationandlateralshortening.Axialcompression：Deformationoftherodisaxialshorteningandlateralenlargement.AXIALTENSIONANDCOMPRESSION55拉压§1–1轴向拉压的概念

5、及实例轴向拉压的外力特点：外力的合力作用线与杆的轴线重合。一、概念轴向拉压的变形特点：杆的变形主要是轴向伸缩，伴随横向缩扩。轴向拉伸：杆的变形是轴向伸长，横向缩短。轴向压缩：杆的变形是轴向缩短，横向变粗。6Inaxialcompression，thecorrespondingforceiscalledcompressiveforce.Inaxialtension，thecorrespondingforceiscalledtensileforce.MechanicalmodelsareshowninthefiguresAXIALTENSIONANDCOMPRESSION77拉压轴向压

6、缩，对应的力称为压力。轴向拉伸，对应的力称为拉力。力学模型如图8Practicalexamplesinengineering2、AXIALTENSIONANDCOMPRESSION99拉压工程实例二、10AXIALTENSIONANDCOMPRESSION1111拉压121、InternalforceInternalforceistheresultantofinternalforces,whichisactingmutuallybetweentwoneighbourpartsinsidethebody,causedbytheexternalforces.§1–2INTERNALFO

7、RCE、METHODOFSECTION、AXIALFORCEANDITSDIAGRAMAXIALTENSIONANDCOMPRESSION1313拉压一、内力指由外力作用所引起的、物体内相邻部分之间分布内力系的合成（附加内力）。§1–2内力·截面法·轴力及轴力图142、Methodofsection·axialforceCalculationoftheinternalforcesisthefoundationtoanalyzetheproblemsofstrength