Book ChapterDOI
Relationship Between Tensile Properties and Microscopically Ductile Plane-Strain Fracture Toughness
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In this article, an equation has been derived which will permit plane-strain fracture toughness, K I c, to be calculated from a knowledge of uniaxial tensile properties.Abstract:
An equation has been derived which will permit plane-strain fracture toughness, K I c , to be calculated from a knowledge of uniaxial tensile properties. After corrections for constraint and strain hardening the plane-stress rigid plastic crack opening displacement expression was found to describe accurately experimental crack opening displacement for the plane-strain condition. The crack tip strain distribution was measured and found to be compatible with an r - 1 strain distribution within a small region ahead of the crack tip. A length parameter was identified and shown to be proportional to mean-free ferrite path in steels. From the proposed behavior of crack tip instability, it was possible to better understand the observed trend of decreasing fracture toughness with increasing yield strength and how this trend can be altered by control of the microstructure.read more
Citations
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Journal ArticleDOI
The effect of loading rate and temperature on fracture initiation in 1020 hot-rolled steel
TL;DR: In this paper, fracture initiation experiments were conducted to determine the fracture toughness of an AISI 1020 hot-rolled steel under quasi-static and dynamic loading conditions, and results were compared to those obtained in quasistatic tests with like specimens.
Journal ArticleDOI
Application of a modified Dugdale model to the K vs COD relation
TL;DR: In this paper, the authors solved the case of a parabolic stress distribution within the plastic strip zone and investigated the relation between stress intensity factor, yield stress and crack opening displacement.
Journal ArticleDOI
Stretch zone formation in cyclic fracture of 20MnMoNi55 pressure vessel steel
TL;DR: In this paper, stretch zone formation during cyclic fracture in a nuclear pressure vessel steel has been examined, where stretch zone features were manifested in local regions, however, their extent could be correlated to the test parameters employed.
Journal ArticleDOI
The combined micro- and macro-fracture mechanics approach to engineering problems of strength
TL;DR: In this paper, a model has been developed for the materials local fracture at the crack tip and a model is employed for the estimation of fracture toughness dependence on temperature and loading rate within a wide range of variations in these characteristics.
Journal ArticleDOI
Effect of several physical and mechanical variables on the relation between COD and J
J. E. Perez Ipiña,H.L. Toloy +1 more
TL;DR: In this paper, the influence of several variables on the relation between COD and J is experimentally studied, including temperature, geometry, strain-hardening exponent, slow stable crack growth, toughness value for each material and rolling direction.