Results 221 to 230 of about 7,277,805 (309)
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Ultrasonic sizing of short surface cracks
Ultrasonics, 2007This paper presents a method for ultrasonic sizing of surface cracks based on time domain and frequency domain Rayleigh wave near-field analysis. The procedure allows for the entire range of ratio of crack depth to Rayleigh wavelength a/lambda to be covered with one single measurement. In the time domain the time-of-flight method was extended to cracks
Bernard, Masserey, Edoardo, Mazza
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Effect of notch length and pre-crack size on mode II fracture energy of brittle adhesives
Engineering Fracture Mechanics, 2019In this study, the effects of notch length and pre-crack size on mode II fracture energy of brittle adhesives are investigated. These effects are not considered by the direct beam theory (DBT) and the compliance-based beam method (CBBM) for the end ...
M. Ayatollahi +3 more
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Punching shear of slabs: crack size and size effects
Magazine of Concrete Research, 2002Fictitious crack model assumptions and equilibrium equations were used to develop a numerical model in order to predict the punching load and the deformations of reinforced concrete slabs. Concrete strength, aggregate type, reinforcement ratio as well as the fracture strength properties were taken into account in developing the new model.
H. Marzouk, M. Osman, A. Hussein
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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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, 2020
The grain size (GS) dependence of fatigue crack growth in nanocrystalline superelastic NiTi shape memory alloys (SMAs) with the average GS of 10, 30, 60 and 235 nm is investigated.
Junyu Chen, H. Yin, Q. Sun
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The grain size (GS) dependence of fatigue crack growth in nanocrystalline superelastic NiTi shape memory alloys (SMAs) with the average GS of 10, 30, 60 and 235 nm is investigated.
Junyu Chen, H. Yin, Q. Sun
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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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Sizing vertical cracks using burst vibrothermography
NDT & E International, 2016Abstract We apply burst vibrothermography to characterize (area and depth) vertical cracks in a fast way. We present the calculation of the evolution of the surface temperature distribution produced by a vertical crack excited by an ultrasound burst. We develop a stabilized inversion algorithm that is able to retrieve the area and depth of the crack ...
A. Mendioroz +4 more
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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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Cohesive crack analysis of size effect
Engineering Fracture Mechanics, 2009Abstract This paper deals with the analysis of size effect in concrete. An extensive campaign of accurate numerical simulations, based on the cohesive crack model, is performed to compute the size effect curves (CSEC) for typical test configurations.
Gianluca Cusatis, Edward A. Schauffert
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