Results 221 to 230 of about 11,298 (262)

A fracture mechanics analysis of ultrasonic fatigue

Engineering Fracture Mechanics, 1982
Abstract The method of ultrasonic fatigue finds increasing interest in materials science. Especially, fatigue crack growth rates near the threshold stress intensity range, ΔK 0 , can be determined with this method in reasonable times providing no frequency and corrosion effects exist.
W. Hoffelner, P. Gudmundson
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FATIGUE CRACK GROWTH UNDER ULTRASONIC FATIGUE LOADING

Fatigue & Fracture of Engineering Materials & Structures, 1997
Abstract— In this paper, a stress and modal analysis of an ultrasonic vibration system consisting of a notched specimen and one or two amplifying horns have been performed by using 3D finite element calculations. The stress intensity factors in ultrasonic fatigue crack propagation are evaluated by means of displacement and energy approaches.
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Ultrasonic Evaluation of Composite Fatigue Damage

1994
Damage in composite materials has been detected using ultrasonic nondestructive techniques.1–5 These studies were all performed on thin composite samples subjected to either a quasi-static tensile force or a constant amplitude tensile fatigue load. Changes in basic ultrasonic parameters, attenuation or velocity, were used as an indicator of damage ...
Andrew J. Gavens, Robert E. Green
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Fatigue Mechanism in Iron at Ultrasonic Frequency

Journal of Applied Physics, 1969
A metallographic study compares the fatigue mechanism in low-carbon iron subjected on the one hand to cycles of strain at an ultrasonic frequency of 17 000 Hz and on the other to 1700 cpm, the relative low order employed in usual engineering tests. It is found that the ultrasonic frequency can produce fatigue cracks at strain amplitudes much smaller ...
W. A. Wood, W. P. Mason
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Ultrasonic Evaluation of Thermal Fatigue of Composites

Journal of Engineering Materials and Technology, 1992
Results are presented on the evaluation of thermally fatigued E-glass composite specimens using ultrasonic techniques. The changes of the acoustic velocity and the attenuation coefficient in the ultrasonic range have been examined as a function of accumulated damage in various thermally fatigued composites.
S. O. Kasap, S. Yannacopoulos, V. Mirchandani, J. R. Hildebrandt   +3 more
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Ultrasonic Characterization of Fatigue Crack Closure

1993
The characterization of fatigue crack closure is an important objective because of its influence on fatigue crack propagation, particularly under conditions of variable amplitude loading. This paper describes a nontraditional technique for characterizing closure, in which ultrasonic scattering measurements are used to obtain estimates of the number ...
RB Thompson, O Buck, DK Rehbein
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Fatigue Mechanism in Titanium at Ultrasonic Frequency

Journal of Applied Physics, 1971
The fatigue mechanism in titanium is studied metallographically for small strain amplitudes (∼0.003) at a frequency of 1700 cpm and at the ultrasonic frequency of 16 000 cps. The ultrasonic frequencies develop high localized strains at solitary slip bands and these bands become the microcracks initiating fatigue.
D. E. MacDonald, W. A. Wood
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Evaluation of Fatigue Strength by Ultrasonic Fatigue Testing

The Proceedings of Conference of Tokai Branch, 2003
Shigehito NISHIMURA, Akitoshi MATSUO, Noboru EGAMI, Hirohisa KIMACHI   +3 more
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Ultrasonic fatigue tests for refractories

Refractories, 1977
I. P. Bas'yas, Yu. K. Malyshkin
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Ultrasonic Fatigue in Copper and Aluminum

1976 Ultrasonics Symposium, 1976
A. Tulyanon, K. Salama
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