材料力学简介(英文).ppt

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1、TheIntroductionofMechanicsofMaterials陈继乐TheresearchobjectofMechanicsofMaterialsThetaskofMechanicsofMaterialsanditsrelationwithengineeringThepropertiesandthefundmentalassumptionsofthesoliddeformablebodiesBasictypesofthedeformationofrods1.TheresearchobjectofMechanicsofMaterialsStructuremembersClassif

2、icationofstructuremembers:plateorshellclumpbodybarorrod2.ThetaskofMechanicsofMaterialsanditsrelationwithengineeringStrength,Rigidity,StabilityStrength:Capacitytoresistfailureofacomponentoranelement.Rigidity:Capacitytoresistdeformationsofacomponentoranelement.Stability:Capacitytoremaintheoriginalsta

3、teinequilibriumofacomponentoranelement.ThetasksofmechanicsofmaterialsUndertherequestthatthestrength,rigidity,stabilityaresatisfied,offerthenecessarytheoreticalfoundationandcalculationmethodfordeterminingreasonableshapesanddimensions,choosingpropermaterialsforthecomponentsatthemosteconomicprice.3.Th

4、epropertiesandthefundmentalassumptionsofthesoliddeformablebodies1.Continuity:Thematerialofasoliddeformablebodyiscontinuouslydistributedoveritsvolumesothattherearenotanycracks,defectsorholesetc.2.Homogeneity:Thematerialofthesoliddeformablebodyishomogeneouslydistributedoveritsvolume.3.Isotropy:Themec

5、hanicalpropertiesarethesameinalldirectionsatapoint.4.Smalldeformations:Thedeformationsforasoliddeformablecausedbyexternalforcesareverysmallcomparedwiththedimensionsofthebody.Thuswhenwestudytheequilibriumandmotionofthesoliddeformablebody,thedeformationofthebodymaybeneglected.4.Basictypesofthedeforma

6、tionofrods1.Axialtension2.Shear3.Torsion4.BendingThankYou!