Torsion Test

Topics: Shear stress, Elasticity, Tensile strength / Pages: 5 (1207 words) / Published: Oct 16th, 2012
Chapter 10

Torsion Tests
Subjects of interest
• Introduction/Objectives • Mechanical properties in torsion • Torsional stresses for large plastic strains • Type of torsion failures • Torsion test vs.Tension test • Hot torsion testing

Suranaree University of Technology

Tapany Udomphol

May-Aug 2007

Objectives

• This chapter provides fundamental knowledge of torsion test and significant parameters such as torque, modulus of rupture in torsion and angle of rotation will be highlighted. • Different types of torsion failures will be evaluated and differentiated from tension failures.

Suranaree University of Technology

Tapany Udomphol

May-Aug 2007

Introduction

• Torsion test is not widely accepted as much as tensile test. • Torsion tests are made on materials to determine such properties as the modulus of elasticity in shear, the torsion yield strength and the modulus of rupture. • Often used for testing brittle materials and can be tested in full-sized parts, i.e., shafts, axles and twist drills which are subjected to torsional loading in service.

Suranaree University of Technology

Tapany Udomphol

May-Aug 2007

Introduction
Examples: • Driveshaft is subjected to torsion in service. www.caradvice.com GKN driveline

Bar shaft
Suranaree University of Technology
Tapany Udomphol

May-Aug 2007

Torsion-testing equipment
Torsion-testing equipment consists of 1) A twisting head, with a chuck for gripping the specimen and for applying the twisting moment to the specimen. 2) A weight head, which grips the other end of the specimen and measures the twisting moment of torque. www.echoscaninc.com Specimen used A circular cross section specimen is normally used since in the elastic range, shear stress varies linearly from a value zero at the centre of the bar to a maximum value at the surface. Note: Thin-walled tubular specimen is frequently used.

Suranaree University of Technology

Tapany Udomphol

May-Aug



References: • Dieter, G.E., Mechanical metallurgy, 1988, SI metric edition, McGraw-Hill, ISBN 0-07-100406-8. Suranaree University of Technology Tapany Udomphol May-Aug 2007

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