Application of ultrasonic angle beam method to measuring fatigue crack closure.
نویسندگان
چکیده
منابع مشابه
Angle Beam Ultrasonic Testing Models and Their Application to Identification and Sizing of Cracks
Identi fication and sizing of surface breaking cracks using angle beam ultrasonic testing in practical situations quite often becomes a very diffi cult task due to the presence of non-relevant signals caused by geometric refl ectors. The present work introduces effective and systematic approaches to take care of such a diffi culty by use of angle beam ultrasonic testing models that can predict ...
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Attached ultrasonic sensors can detect changes caused by crack initiation and growth if the wave path is directed through the area of critical crack formation. Dynamics of cracks opening and closing under load cause nonlinear modulation of received ultrasonic signals, enabling small cracks to be detected by stationary sensors. A methodology is presented based upon the behavior of ultrasonic sig...
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Fatigue crack growth can be strongly influenced by crack closure, i. e., the contacting of the opposing faces of a fatigue crack above the minimum load in a loading cycle. This crack closure shields the crack tip from the full stress field, but different views are held regarding the extent of this shielding. The type of closure, whether it be plasticity-induced, or roughness-induced may also pl...
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Plasticity-induced, roughness-induced and oxide-induced crack closures are reviewed. Special attention is devoted to the physical origin, the consequences for the experimental determination and the prediction of the effective crack driving force for fatigue crack propagation. Plasticity-induced crack closure under plane stress and plane strain conditions require, in principle, a different expla...
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A 2-dimensional, elastic-plastic finite element model has been developed to simulate plasticity induced crack closure in slanted and deflected cracks growing outside the small scale yielding (SSY) regime. The finite element model allows for contact between deformable surfaces to capture the complex contact interaction between the crack faces. Coulomb’s friction law has been used to model fricti...
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ژورنال
عنوان ژورنال: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
سال: 1987
ISSN: 0387-5008,1884-8338
DOI: 10.1299/kikaia.53.2255