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Crack‐Resistance Curves of Surface Cracks in Alumina
Journal of the American Ceramic Society, 1988The resistance of coarse‐grained alumina to stable crack growth, initiated from “naturally’occurring surface flaws, was studied in strength tests with a bend‐bar technique. The surface cracks experienced R‐curve behavior over the first few hundred micrometers; i.e., the applied crack driving force had to be increased with crack extension. Compared to R
Rolf W. Steinbrech, Olaf Schmenkel
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Characterization of Surface Crack Using Surface Waves
Applied Mechanics and Materials, 2012Surface cracks are the most common defects in structures. Ultrasonic has been widely used as a non-destructive evaluation technology in the case of crack characterization. In this investigation, surface waves are applied to a steel block with artificial slots to characterize the crack depth.
Shiuh Chuan Her, Sheng Tung Lin
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Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1959
The sodium vapour etching experiments of Andrade & Tsien (1937) were repeated with chemical Pyrex glass. By employing a ball indenter in conjunction with the vapour etching, it was possible to determine with greater accuracy the real nature of the surface cracks that were developed.
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The sodium vapour etching experiments of Andrade & Tsien (1937) were repeated with chemical Pyrex glass. By employing a ball indenter in conjunction with the vapour etching, it was possible to determine with greater accuracy the real nature of the surface cracks that were developed.
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2000
Metal fatigue or failure usually begins from the surface. Aircraft fuselage, nuclear power plant steam generator tubings and steel bridges are examples of environments in which this type of metal failure occurs. Hence, fatigue and stress crack detection on metallic structures is of utmost importance to the on-line and in-service inspections of metallic
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Metal fatigue or failure usually begins from the surface. Aircraft fuselage, nuclear power plant steam generator tubings and steel bridges are examples of environments in which this type of metal failure occurs. Hence, fatigue and stress crack detection on metallic structures is of utmost importance to the on-line and in-service inspections of metallic
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Estimates of Crack-Driving Force in Surface-Cracked Elbows
Journal of Pressure Vessel Technology, 2000The objective of this effort was to assess whether a simple relationship could be developed between the behavior of surface cracks in straight pipe and in elbows. If such a geometric relationship could be developed, then a simple multiplier could be applied to the current straight-pipe solutions that are already used in codes and standards such as the ...
Gery M. Wilkowski +2 more
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Crack growth and closure behaviour of surface cracks
International Journal of Fatigue, 2004Abstract This paper investigated the crack growth and closure behaviour of surface cracks in AISI 4130 alloy steel under the constant amplitude loading and single-overload conditions. The compliance measurements of depth- and surface-wise crack closure were performed using the backface strain gauge and the near-tip gauge, respectively.
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Crack Shape Development of Two Interacting Surface Elliptical Cracks
Computer Technology and Applications, 2003The issue of assessing residual life of an aged structure based on damage tolerance concepts attained significance in high technology fields such as aerospace, piping and pressure vessels and nuclear engineering. Computational fracture analysis of these structures in the presence of single or multi-site surface flaws is essential for life estimation ...
S. K. Patel +2 more
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Effect of crack surface geometry on fatigue crack closure
Metallurgical and Materials Transactions A, 1995The geometry of crack faces often plays a critical role in reducing crack extension forces when crack closure occurs during fatigue crack growth. Most previous studies of fatigue crack closure are concerned with mechanical measures of closure as related to the crack growth rate; very little attention has been given to the geometry of the crack surfaces.
W. J. Drury +2 more
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Development of Crack Depth Indicator for Deep Surface Crack
Nondestructive Evaluation Engineering, 2005Crack depth indicator using a direct current potential drop technique has been generally applied to the nondestructive inspection in the thermal power plants such as steam pipe and turbine casing. In this paper, the authors presented practical studies concerning the development of the advanced crack depth indicator for the deep surface crack.
Manabu Hayakawa +3 more
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Crack opening displacement in pressurized spheres with surface cracks
International Journal of Fracture, 1985The crack opening displacement at the centre of a surface crack in a pressurized sphere has been calculated using a strip yielding model. The shallow shell solution for the stress intensity factor derived by Folias has been extended to derive the COD, and the resulting equations have been solved numerically by a procedure due to Erdogan.
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