## Mechanical metallurgy |

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Page 338

CHAPTER TEN THE

not met with the wide acceptance and the use that have been given the tension

test. However, it is useful in many engineering applications and also in

theoretical studies of plastic flow.

determine such properties as the modulus of elasticity in shear, the

strength, and the modulus of rupture.

-sized parts, such ...

CHAPTER TEN THE

**TORSION**TEST 10-1 INTRODUCTION The**torsion**test hasnot met with the wide acceptance and the use that have been given the tension

test. However, it is useful in many engineering applications and also in

theoretical studies of plastic flow.

**Torsion**tests are made on materials todetermine such properties as the modulus of elasticity in shear, the

**torsional**yieldstrength, and the modulus of rupture.

**Torsion**tests also may be carried out on full-sized parts, such ...

Page 343

changes lead to the superposition of longitudinal stresses of unknown magnitude

on the

small compared to the shearing stresses and can be ignored, they may be

important in influencing the

length change can be greatly minimized, at some increase in experimental

complexity, by using a

move.

changes lead to the superposition of longitudinal stresses of unknown magnitude

on the

**torsional**shearing stresses. While these longitudinal stresses usually aresmall compared to the shearing stresses and can be ignored, they may be

important in influencing the

**torsional**strain to fracture. Extraneous stresses due tolength change can be greatly minimized, at some increase in experimental

complexity, by using a

**torsion**tester in which one end of the specimen is free tomove.

Page 345

This comparison shows that Tmax will be twice as great in

for a given value of amax. Since as a first approximation it can be considered that

plastic deformation occurs on reaching a critical value of Tmax and brittle fracture

occurs on reaching a critical value of amax, the opportunity for ductile behavior is

greater in

which can be considered representative of the condition for a brittle material such

as ...

This comparison shows that Tmax will be twice as great in

**torsion**as in tensionfor a given value of amax. Since as a first approximation it can be considered that

plastic deformation occurs on reaching a critical value of Tmax and brittle fracture

occurs on reaching a critical value of amax, the opportunity for ductile behavior is

greater in

**torsion**than in tension. This is illustrated schematically in Fig. 10-6,which can be considered representative of the condition for a brittle material such

as ...

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### Contents

Stress and Strain Relationships for Elastic Behavior | 18 |

from Elastic Strains 213 Strain Energy 214 Anisotropy | 46 |

Metallurgical Fundamentals | 101 |

Copyright | |

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### Common terms and phrases

alloy angle annealed ASTM atoms axes axis behavior billet brittle fracture Burgers vector cold-worked components compression constant crack creep cycles decrease determined diameter direction dislocation line ductile edge dislocation elastic elongation embrittlement energy engineering equation extrusion factor failure fatigue limit fibers Figure flow curve flow stress force forging friction given grain boundaries hot-working hydrostatic increase indentation lattice length load machining martensite material matrix maximum measured mechanical metallurgy Metals Park modulus necking notch occurs particles percent plane strain plane-strain plastic deformation plastic strain pressure produce properties ratio recrystallization reduction region residual stresses rolling screw dislocation shear stress sheet shown in Fig slip plane slip systems Society for Metals specimen steel strain hardening strain rate stress-strain curve structure surface temperature tensile strength tensile stress tension test tensor thickness tool torsion Trans usually velocity workpiece yield strength yield stress