SEDL / STP / STP1231-EB / STP13973S

An Automatic Ultrasonic Fatigue Testing System for Studying Low Crack Growth at Room and High Temperatures

Wu, T
Graduate student, post-doctoral researcher, and professor, Conservatoire, National des Arts de Métiers, Institute des Technologies et des Matériaux Avancés, Paris,

Ni, J
Graduate student, post-doctoral researcher, and professor, Conservatoire, National des Arts de Métiers, Institute des Technologies et des Matériaux Avancés, Paris,

Bathias, C
Graduate student, post-doctoral researcher, and professor, Conservatoire, National des Arts de Métiers, Institute des Technologies et des Matériaux Avancés, Paris,

Pages: 10    Published: Jan 1994

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Abstract

In this paper, an automatic ultrasonic fatigue testing system is presented, including a computer control and acquisition system, a video-camera-television system, an induction heating device, a magneto-strictive vibrator, and other electronic apparatus. The test machine controlled by an IBM PS/2 computer with analog to digital (A/D) and digital to analog (D/A) convertors runs at a very high frequency, about 20 kHz, and it carries out endurance tests and crack growth tests at room or high temperature. In this paper, a S-Ncurve for UDIMET 500 at room temperature and two fatigue crack growth rate (FCGR) curves in near-threshold regime for ASTROLOY at 20 and 400°C under ultrasonic fatigue testing are published.