کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
290075 | 509712 | 2008 | 14 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Estimation of complex Young's modulus of non-stiff materials using a modified Oberst beam technique Estimation of complex Young's modulus of non-stiff materials using a modified Oberst beam technique](/preview/png/290075.png)
The paper presents a modified Oberst beam technique to evaluate the complex Young's modulus of non-stiff materials. Unconstrained layer theories and non-parametric complex modulus identification methods used for stiff materials form the basis for the method. The proposed approach has several advantages over the standard Oberst beam technique. In particular, the layer properties can be evaluated at any frequency, and the base beam need not be completely covered with the layer material. In addition, the proposed method does not require that the complex modulus vs. frequency curve for the base beam should have a flat area near analyzed resonance frequencies in order to yield accurate results. The experiments conducted on a styrene–butadiene rubber (SBR) sample using a polymethyl methacrylate (PMMA) base beam produced good results. Uncertainty analysis shows that the measurement accuracy can be improved by increasing the modulus magnitude ratio between the layer material and the base beam material, or the thickness ratio between the layer and base beam.
Journal: Journal of Sound and Vibration - Volume 316, Issues 1–5, 23 September 2008, Pages 87–100