(1.6.1)--3.10材料力学材料力学.ppt

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1、Chapter 3 Torsion Mechanics of Materials3.10 Chapter Summary&Review Chapter Summary&Review Tortional Moment DiagramTransmission of power by circular shaftsTortional moment diagram(TMD)Sketch that expresses the law of change of the torque in each cross section along the axis.Chapter Summary&Review To

2、rsional Deformations of a Circular BarFor circular bars and tubes,the shearing stress()and strain()vary linearly with radial distance from the center of the cross-section.Thin-walled tubes are more efficient in torsion than solid circular bars.Chapter Summary&Review Torque-Displacement RelationFor p

3、ure torsion,the total angle of twist Torsional stiffnessTorsional flexibilityFor nonuniform torsion,the total angle of twist Chapter Summary&Review Stresses and Strains in Pure ShearMaximum normal stressesMaximum shear stressesThe maximum shear and normal strainsChapter Summary&Review Statically Ind

4、eterminate Torsional MembersThe equations of equilibrium will no longer be adequate for determining the torques.Write equations of equilibriumFormulate equations of compatibilityChapter Summary&Review Strain Energy in Torsion and Pure ShearFor linearly elastic material with small angles of twistPure

5、 TorsionNonuniform TorsionChapter Summary&Review Thin-walled tube with noncircular closed cross sectionsThin-walled circular tubeThin-walled rectangular tubeAm the area enclosed by the median line of the cross sectionChapter Summary&Review Thin-walled tube with noncircular closed cross sectionsFor constant thickness tFor pure torsionEnd