A yield criterion for ductile metals based upon atomic structure

✍ Scribed by Milton C. Shaw

• Book ID: 103077842
• Publisher: Elsevier Science
• Year: 1952
• Tongue: English
• Weight: 981 KB
• Volume: 254
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(52)90609-1

✦ Synopsis

A strength theory for ductile metals is presented that takes into account the short range inhomogeneities that are present in all commercial metals. Examples are presented to illustrate the shortcomings of the conventional maximum shear stress and distortion energy theories that result from the failure of these theories to recognize the inhomogeneous nature of metals. The new theory predicts a variation in yield stress with specimen size and it is shown why such a size effect is observed with torsion specimens but not with tensile specimens of usual size. The size effect in fatigue testing and hardness testing by means of micro techniques is discussed to illustrate further the concepts presented. Finally, the relation of the new theory for ductile metals to the statistical theory of Weibull for brittle materials is considered.