SEDL / STP / STP677-EB / STP34949S

On the Cup and Cone Fracture of Tensile Bars

Kong, B
Undergraduate research assistant and professor of mechanics, Washington University, St. Louis, Mo.

Paris, PC
Undergraduate research assistant and professor of mechanics, Washington University, St. Louis, Mo.

Pages: 11    Published: Jan 1979

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Abstract

This paper attempts to apply the recently developed concepts of tearing instability for cracks under fully plastic conditions to tensile bar fracture. Presuming that the transition from flat fracture to the shear wall of a cup and cone fracture is triggered by the onset of tearing instability is supported by experimental data. Moreover, additional experimental evidence indicates that the initial flat part of the fracture precedes instability for cup and cone behavior. Therefore, this work suggests that the tearing instability theory may indeed be applicable to at least some situations involving extensive plastic deformation prior to cracking failure.