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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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Grain Size Effects in Hydrogen-Assisted Cracking
Metallurgical Transactions A, 1976There is conflicting evidence in the literature with respect to the effect of grain size on hydrogen embrittlement. Differences may arise because of the degree of segregation in different grain size materials, because of different structures obtained in the effort to produce varying grain sizes, or because of the grain-size dependency of diffusion and ...
J. F. Lessar, W. W. Gerberich
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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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Sizing Stress Corrosion Cracks Using Laser Ultrasonics
2010 8th International Pipeline Conference, Volume 1, 2010Integrity management decisions related to operating energy transmission pipelines affected by Stress Corrosion Cracking (SCC) represent a formidable challenge to the pipeline industry. Effective management of SCC damage requires the development of tools and technology to identify the occurrence of SCC and to assess the impact of the SCC on pipeline ...
Hamood Rehman +6 more
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Vibroacoustical nondestructive evaluation of fatigue crack size
The Journal of the Acoustical Society of America, 1999For the vibroacoustical nondestructive evaluation of the fatigue crack’s relative size the feature set, components of which are ratios of the testing object free or forced oscillations spectral amplitudes of higher and basic harmonics, is used. The features being used are functions of the relative crack size and do not depend on initial excitation ...
Nadejda I. Bouraou +1 more
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Sizing Stress Corrosion Cracking Using Laser Ultrasonics
2008 7th International Pipeline Conference, Volume 2, 2008Managing Stress Corrosion Cracking (SCC) damaged pipe has been a formidable challenge to the pipeline industry. Development of a practical solution for measurement and evaluation of SCC has been marred by the complexity of crack shapes, their distribution within a crack colony, and the lack of non-destructive technology capable of reliably measuring ...
Marvin Klein +4 more
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Estimating plastic zone sizes for edge cracks
International Journal of Fracture, 1984The Dugdale model [i] is widely used to give an estimate of the plastic zone size for finite or semi-infinite geometries. Inasmuch as the Dugdale model is an approximate model and is computationally solved as an elasticity problem with the band of yield stress around the crack tip considered as an additional load system, the following simple method for
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Mode I solution for micron-sized crack
Engineering Fracture Mechanics, 2005Abstract The feature size of micro-electronic, optoelectronic and biomedical devices is in the sub-micron scale and is pushing toward the nanometer scale. Defects in these small structures are correspondingly smaller such that small crack behavior is becoming an important design consideration for reliability and performance of such devices.
Tong, Pin +2 more
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The influence of crack size on the fracture behaviour of short cracks
International Journal of Fracture, 1990Crack size effects are investigated by applying local fracture criteria at a specific distance ahead of a crack tip, related to the material’s microstructure. For sufficiently long cracks, the criteria are applied at points within the singularity-dominated region and then failure corresponds to the attainment of a critical intensity of the singularity ...
G. Harlin, J. R. Willis
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Effect of crack size on fatigue life
2003NDT evaluation of a steel plate shows that there are cracks present of 3 mm which grew by fatigue to a final crack length under service conditions of 8 mm, determined by fast fracture. Calculate the percentage increase in fatigue life for the plate: (a) if the final crack length is extended by 2 mm to 10 mm through the use of a material of ...
A. Afagh, Y.-W. Mai
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