1. Jiangyu Li, University of Washington 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 Mechanics of Materials Lab

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

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

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

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

6. 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.

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

8. 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.

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

10. 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

11. 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  = 0, and (b) distortion of an element oriented at  = 45°.

12. Jiangyu Li, University of Washington Torsion Test

13. 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.