A fracture mechanics analysis of ultrasonic fatigue

✍ Scribed by W. Hoffelner; P. Gudmundson

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 532 KB
• Volume: 16
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(82)90114-x

✦ Synopsis

The method of ultrasonic fatigue finds increasing interest in materials science. Especially, fatigue crack growth rates near the threshold stress intensity range, AK,, can be determined with this method in reasonable times providing no frequency and corrosion effects exist. But for an accurate application of this technique it is necessary to improve the testing systems and also the determination of the dynamic cyclic stress intensity range, AK. In this paper, fatigue crack growth experiments at ultrasonic frequencies with diferent meun stresses and also the calculation of the dynamic stress intensity range with finite elements are treated. On this basis fatigue crack growth curves at room temperature of the alloys Hastelloy X and IN 800 were measured and compared with results obtained at low frequencies. No significant influence of frequency could be found in these materials.