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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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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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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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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 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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Crack-size distribution in homogeneous solids
International Journal of Fracture, 1979Thermally activated crack propagation takes place by consecutive bond breaking and occasional mending steps. This process can be represented by a differential equation that describes the crack-size distribution as a function of time for single-step processes.
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Critical crack size in the fracture of metals
Technical Physics, 2007A physical approach developed by I.I. Novikov is applied for estimating and predicting critical crack lengths in metals. Experimental data obtained for single crystals are considered. The necessity of taking into account the critical crack lengths in J integrals is demonstrated.
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Effects of the ratio of flaw size to specimen size on cracking behavior
Bulletin of Engineering Geology and the Environment, 2014To investigate the size effects on the cracking behavior of flaw-containing specimens under compressive loading, rectangular parallelepiped specimens containing a single centrally located flaw are numerically loaded using the bonded-particle model (BPM).
Wong, Louis Ngai Yuen +2 more
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Crack size independence of the crack driving force in the buckled plate specimen
Journal of Materials Science, 1989A new fracture mechanics specimen, the buckled plate specimen, has been developed with the attractive property that the crack driving force is independent of crack size during constant deflection tests. The mechanics analysis and results of lgepal assisted slow crack growth in polyethylene are presented as verification.
P. Chang, J. A. Donovan
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