Mechanics of Materials Lab Lecture 16 Torsion Mechanical

Mechanics of Materials Lab Lecture 16 Torsion Mechanical Behavior of Materials Section 4. 9. 3 -4. 9. 4 Discussion on the torsion test posted online Jiangyu Li University of Washington Jiangyu Li, University of Washington

Angle of Twist © 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Fig. 3 -3 Deformations of a circular bar in pure torsion. Jiangyu Li, University of Washington

© 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Fig. 3 -4 Deformation of an element of length dx cut from a bar in torsion. Jiangyu Li, University of Washington

Shear Strain © 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Fig. 3 -5 Shear strains in a circular tube. Jiangyu Li, University of Washington

Shear Stress © 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Jiangyu Li, University of Washington

© 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Fig. 3 -7 Longitudinal and transverse shear stresses in a circular bar subjected to torsion. Jiangyu Li, University of Washington

Torque © 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Jiangyu Li, University of Washington

© 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Fig. 3 -10 Circular tube in torsion. Jiangyu Li, University of Washington

Fig. 3 -20 Stresses acting on a stress element cut from a bar in torsion (pure shear). Jiangyu Li, University of Washington © 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license.

Principal Stress © 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Jiangyu Li, University of Washington

© 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Fig. 3 -25 Strains in pure shear: (a) shear distortion of an element oriented at q = 0, and (b) distortion of an element oriented at q = 45°. Jiangyu Li, University of Washington

Torsion Test Jiangyu Li, University of Washington

© 2001 Brooks/Cole, a division of Thomson Learning, Inc. Thomson Learning™ is a trademark used herein under license. Fig. 3 -24 Torsion failure of a brittle material by tension cracking along a 45° helical surface. Jiangyu Li, University of Washington