Since several years we are using succesfully the method of the in situ acoustic emission measurements for the investigation of the kinetics of deformation mechanisms in high-alloy CrMnNi TRIP steel. At the moment, we perform our measurments during tensile tests with maximum temperatures of 100 °C (373 K). But, in the near future we plan to extend our investiagtion to another group of materials - fire resistant materials. Here bending tests up to 1500 °C (1773 K) are planned. As I learned already, AE sensors are available up to a maximum temperature of about 800 °C (1073 K). One methode should be the use of an alumina wave guide to submit the acoustic waves out of the hot zone to an area with lower temperatures where the AE sensor can be than applied. Is there somebody in the community how has already experience with such type of experiments and who is willing to share it with us?
Yes, I did in 2 articles; 1988 and 1999. The most basic effects was the increase of pulse rate, in temporal call analysis, with increasing temperature.
Thanks for your answer. Is there a chance to get these papers from you?
Yes of course, I will do as I scan the original article because at that time a soft copy was no available. I know from your skills that you use the acoustic analysis in material characterization, do you think that the acoustic characteristics in biology (vocalization) is comparable in metallurgy. By the way the authors of my article at 1988 was me and Professor Hans Schneider; the head of Zoologisches Institut der Universitat Bonn Poppelsdorfer Schloss, D-5300 Bonn 1. A that institute I have prepared my Ph.D (1982-1984). The publisher was germany and the full adress of the article:
Social Behaviour, Call Repertory and Variation in the Calls of the Pool Frog, Rana Lessonea.
Radwan, N.M.* and Schneider, H.**
*Department of Zoology, Faculty of Science, Cairo University.
**Zoologisches Institut der Universitat Bonn Poppelsdorfer
Schloss, D-5300 Bonn 1, Federal Republic of Germany.
Amphibia - Reptilia. E. J. Brill., 9: 329-351 (1988).
I hope u can get it at Home Land.
I might suggest that you take a look at this website:
www.LaserSenseInc.com
This company, with which I was previously associated, has developed a laser interferometer that provides non-contact measurement of AE. Wide bandwidth (0 Hertz to 1,000,000+ Hertz has been demonstrated, along with large dynamic range, with this portable device. I know that the device was previously used to conduct pre-fire tests, using AE, on PVC pipe. The purpose of this testing was to determine if AE testing could be used to detect the onset of fire well before smoke or charring was evident. Obviously, your situation is different but the testing on the PVC pipe section was successful.
Dear Mr. Zarroli, thank you for your answer. I agree with you, Laser interferrometry will be a good possibility for AE measurments. I will check out the website promised by you.
With kind regrads. Anja
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