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Deformation and Ductile Fractures of Metals in Torsion and Tension

Report Number: AFOSR-2276
Author: Polakowski, N. H.
Author: Mostovoy, S.
Corporate Author: Illinois Inst. of Tech. Dept. of Metallurgical Engineering
Date of Publication: 1962-02
Pages: 37
Contract: AF 49(638)308

The various types of shear fractures are classified and It is suggested that the cup-and-cone type occurs when an axisymmetrical stress gradient or a likewise orientation exists. Attention is also drawn to the constancy of the fracture stress within a broad range of initial prestrain by methods other than tension. Transient deformation instability in torsion is studied. The increase of ductility of work hardened FCC metals at low temperature is discussed and it is concluded that this spectacular change is caused by the increase of the strain-hardening exponent. The Swift fracture in tension is shown to often deviate from the plane of the torsional prestrain helix. It was possible to localize a Swift fracture to a single shear band which resulted in an "end mill" type fracture which progressed violently without penetrating, however, into the metal outside the band.

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