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Material grain size and crack size influences on cleavage fracturing
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2015A review is given of the analogous dependence on reciprocal square root of grain size or crack size of fracture strength measurements reported for steel and other potentially brittle materials. The two dependencies have much in common. For onset of cleavage in steel, attention is focused on relationship of the essentially athermal fracture stress ...
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Size Effects on Quasi-Static Growth of Cracks
SIAM Journal on Mathematical Analysis, 2005Summary: We perform an analysis of the size effect for quasi-static growth of cracks in isotropic linearly elastic bodies under antiplanar shear. In the framework of the variational model proposed by \textit{G. A. Francfort} and \textit{J. J. Marigo} in [J. Mech. Phys.
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MRS Proceedings, 1994
AbstractTwo aspects of fast cracks are considered: 1. the terminal velocity, and corresponding relative kinetic energy; 2. the grain size dependence of the fracture. It is argued that this is determined by the kinetic energies of cracks when they have expanded enough to reach the boundaries of the grains in which they lie.
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AbstractTwo aspects of fast cracks are considered: 1. the terminal velocity, and corresponding relative kinetic energy; 2. the grain size dependence of the fracture. It is argued that this is determined by the kinetic energies of cracks when they have expanded enough to reach the boundaries of the grains in which they lie.
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Plastic zone size in fatigue cracking
International Journal of Pressure Vessels and Piping, 1996Fatigue tests were performed on the specimens of Type 304 stainless steel and Inconel 718. To investigate the effects of specimen thickness on crack tip deformation and fatigue crack growth rate (FCGR), specimens of different thickness were used. To validate fatigue crack propagation in terms of plastic zone size, elastic plastic fracture mechanics ...
Heung-Bae Park +2 more
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2018
AE technique has been widely applied to detect and locate fatigue cracks in metallic structures. However, it is still a challenging task to accurately quantify the size of a fatigue crack using AE technique (Gagar et al., Smart Mater Struct 23(10):105033, 2014).
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AE technique has been widely applied to detect and locate fatigue cracks in metallic structures. However, it is still a challenging task to accurately quantify the size of a fatigue crack using AE technique (Gagar et al., Smart Mater Struct 23(10):105033, 2014).
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Nonarbitrary Crack Size Concept for Fatigue Crack Initiation
2005Abstract This appendix presents an analytical model that estimates damage rates for both crack initiation and propagation mechanisms. The model provides a nonarbitrary definition of fatigue crack initiation length, which serves as an analytical link between initiation and propagation analyses and appears to have considerable merit in ...
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Size Effect in the Cracking of Drying Soil
2008Cracking in soils due to water loss is a problem not much studied from a mechanical point of view, despite its environmental implications. For instance, if a clayey soil is used as an impervious barrier in open waste sites, an intense drought may origin cracks and therefore preferential flow paths for polluted water.
Pere C. Prat +2 more
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Critical crack sizes in ductile piping
International Journal of Pressure Vessels and Piping, 1981Abstract The list of formulations for critical crack sizes in pipes is extended to cracks in the intrados and extrados of pipe bends and modified for circumferential part-through wall flaws. The methods to derive these formulae are indicated. All results are experimentally verified by comparison with published work or by results of tests conducted ...
W. Kastner +3 more
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Crack sizing by laser excited thermography
NDT & E International, 2012Abstract Active thermography is a nowadays widely used NDT method making use of thermal material properties for defect detection. Basically, the sample is heated and the resulting surface temperature is recorded by an IR camera. For laser thermography a laser is used to heat the sample locally.
J. Schlichting +2 more
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Size effect on crack-tip creep
Engineering Fracture Mechanics, 1996Creep Energy Dissipation (CED) rate due to crack-tip creep zone and load-line deflection rate are calculated under small-scale creep conditions for Compact Tension (CT) specimens of four different widths. It is observed that CED rate has a unique parabolic relation with the crack-tip stress intensity factor, K and thus it depends on the specimen width.
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