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The objective of this work was to take an in-depth look at the process of ductile tearing instability and, especially, to evaluate experimentally the conditions for arrest of a ductile tearing instability. A secondary objective was to evaluate the sensitivity of a ductile tearing instability arrest to the rate at which it occurred and to the material rate sensitivity. Major conclusions are that the ductile tearing instability initiates slowly, but in a mechanical spring apparatus, it approaches drop-tower crack growth rate conditions, and hence the phenomenon is affected by the material rate sensitivity. The conditions necessary for arrest are completely stated and demonstrated by experimental data on a 3% nickel structural steel.
crack instability, tearing instability, crack arrest, tearing modulus, elastic-plastic fracture, J, -integral, crack propagation, fracture mechanics, nonlinear fracture mechanics
Professor of mechanical engineering, United,