A Sensitive Ultrasonic Approach to NDE of Tightly Closed Small Cracks
Affiliation:
1. Department of Mechanical Engineering, Tohoku University, Sendai 980-8579, Japan
Abstract
A sensitive ultrasonic technique for the quantitative nondestructive evaluation of small closed cracks is developed. The use of an oblique longitudinal wave with small angle of incidence upon the specimen surface is emphasized. Firstly, ultrasonic testing is performed with open cracks in order to predict the optimum angle of evaluation, and an empirical calibration equation is then derived for the same as a basis to deal with the analysis of closed cracks. From the measurement on real fatigue cracks, the parameters of interest, specifically the crack size and the closure stress, are determined simultaneously by analyzing the inverse problem. The method developed here is fully automated and computer-controlled. Evaluated results are found to be in good conformity with the destructive measurements, and the corresponding superiority of the method is realized, especially for tightly closed small fatigue cracks, when compared with the method using a beam of longitudinal wave incident normally and/or with a large angle.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality
Reference16 articles.
1. Buck, O., and Tittman, B. R., 1982, “The Ultrasonic Characterizations of Fatigue Cracks,” Advances in Crack Length Measurement, ed, C. J. Beevers, Engineering Material Advisory Services, Wasley, UK, pp. 413–446. 2. Buck, O., and Skillings, B. J., 1982, “Effects of Closure on the Detection Probability of Fatigue Cracks,” Review of Progress in Quantitative Nondestructive Evaluation, eds., D. O. Thompson and D. E. Chimenti, Plenum, New York, NY, Vol. 1, pp. 349–353. 3. Buck, O., Skillings, B. J., and Reed, L. K., 1983, “Simulation of Closure: Effects on Crack Detection Probability and Stress Distributions,” Review of Progress in Quantitative Nondestructive Evaluation, eds., D. O. Thompson and D. E. Chimenti, Plenum, New York, NY, Vol. 2A, pp. 345–352. 4. Buck
O.
, ThompsonR. B., and RehbeinD. K., 1984, “The Interaction of Ultrasound with Contacting Asperities: Applications to Crack Closure and Fatigue Crack Growth,” Journal of Nondestructive Evaluation, Vol. 4, No. 3/4, pp. 203–212. 5. Clark
R.
, DoverW. D., and BondL. J., 1987, “The Effect of Crack Closure on the Reliability of NDT Predictions of Crack Size,” NDT Intern, Vol. 20, No. 5, pp. 269–275.
Cited by
15 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献
|
|