Journal ArticleDOI
High‐power, ultrasonic fatigue testing machine
J. K. Tien,S. Purushothaman,R. M. Arons,J. P. Wallace,O. Buck,H. L. Marcus,R. V. Inman,G. J. Crandall +7 more
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TLDR
In this article, a machine capable of fatigue testing high strength alloys at an ultrasonic frequency (20 kHz), and a range of temperatures likely to be encountered by such materials in aerospace and power generation applications and in basic research, is described.Abstract:
A machine capable of fatigue testing high strength alloys at an ultrasonic frequency (20 kHz), and a range of temperatures likely to be encountered by such materials in aerospace and power generation applications and in basic research, is described. The machine is assembled entirely from commercially available components used in ultrasonic joining processes. Basically, it consists of a power supply module and heavy duty transducer capable of delivering up to 1.2 kW of acoustic energy at peak‐to‐peak amplitudes ranging from 10 to 20 μ, which is further amplified by tuned acoustic horns. The machine sets up a 20 kHz standing wave in the resonant test specimen. Peak‐to‐peak displacement amplitudes in the specimen of up to 300 μ (typical stress levels up to 1400 MN/m2) can be achieved. Provisions have also been made to accurately monitor the frequency of testing and the displacement amplitude during the test. As an example of the capabilities of the machine, results of high‐frequency fatigue tests performed o...read more
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Proceedings ArticleDOI
Development of ultrasonic fatigue for rapid, high temperature fatigue studies in turbine engine materials
Amit Shyam,Christopher J. Torbet,Sushant K. Jha,J. M. Larsen,M.J. Caton,Christopher J. Szczepanski,Tresa M. Pollock,J. W. Jones +7 more
TL;DR: In this article, a system for ultrasonic fatigue testing at temperatures as high as 700 C and at positive mean stresses has been developed and its use is demonstrated by examining the fatigue behavior in the lifetime range of 10 to 10 cycles for the nickel-base superalloy Rene' 88 DT at 20 and 593 C for a load-ratio of 0.05.
Journal ArticleDOI
Plasticity due to superimposed macrosonic and static strains
I. Hansson,A. Thölen +1 more
TL;DR: In this paper, the effect of superposition of a high power ultrasonic and a "static" strain on the microstructure of commercial aluminium containing 1% Si and 0.6% Mg was investigated.
Journal ArticleDOI
Slow crystallographic fatigue crack growth in a nickel-base alloy
TL;DR: In this paper, the authors measured fatigue crack propagation rates at very low cyclic stress intensity levels (1 to 3 MNm-372) in cube-oriented, planar slip nickel-base superalloy monocrystals using a high frequency (20 kHz) resonant fatigue testing technique.
Journal ArticleDOI
HIGH CYCLE FATIGUE AND THRESHOLD BEHAVIOUR OF POWDER METALLURGICAL Mo AND Mo‐ALLOYS
TL;DR: A detailed characterization of the room temperature fatigue properties of powder metallurgical Mo, Mo-W and Ti-Zr-Mo (TZM) alloys is presented in this paper.
Journal ArticleDOI
Fatigue crack growth at 20 kHz-a new technique
TL;DR: In this paper, a method for investigating fatigue crack propagation at very low crack propagation rates using resonant transverse 20 kHz oscillations of a three-point bend specimen was described.
References
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Journal ArticleDOI
Fatigue Mechanism in Titanium at Ultrasonic Frequency
D. E. MacDonald,W. A. Wood +1 more
TL;DR: The fatigue mechanism in titanium was studied metallographically for small strain amplitudes (∼0.003) at a frequency of 1700 cpm and at the ultrasonic frequency of 16 000 cps.