Studies of nonlinear elastic behavior of alumina by resonant techniques

 
N.D.Tkachuk
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Electron Microscopy and Strength of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2013, #19
http://www.materials.kiev.ua/article/776

Abstract

The nonlinear elastic behavior of the samples of porous alumina, containing 4 to 16% of polyethylene glycol binder sintered at 1623 to 1848 K under condition of mechanical resonance for determine of possibility to use of new non-destructive acoustic techniques with aim to estimate of presence of crack-like defects in ceramics was studied using Fourier analysis and wavelet analysis. The dependences of magnitude of second harmonic U2 on magnitude of fundamental oscillation U1 were studied. The ratio U2/U12 was found to be a constant of materials. It was observed that behavior of materials differed under tension and under compression during elastic oscillations, that caused by presence and instability of crack-like defects and that result in generation of harmonics. Full text download


AL2O3, CRACK-LIKE DEFECTS, FOURIER ANALYSIS, NONLINEAR OSCILLATIONS, NONLINEAR RESONANT TECHNIQUES