Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Elastic Modulus Prediction for Design of Sintered Aluminum by Ultrasonic

초음파에 의한 알루미늄 소결체 설계를 위한 탄성계수 예측

  • Published : 2008.07.01
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Abstract

The ultrasonic velocities of sintered aluminum with varying density were measured in order to deduce the mechanical properties for optimum design of the sintered aluminum. Specimens with different densities were prepared by the plasma activated sintering machine. The density distribution of sintered aluminum becomes partially inhomogeneous because of the friction between the powder and the die during compaction. The elastic moduli are increased as the ultrasonic velocity is increased. Furthermore, Poisoon's ratio is depending on not only the density but also the size and distribution of voids. As the specimen's thickness increases, the center frequency in the frequency spectrum of the reflection wave is shifted to the low frequency. The attenuation coefficient of ultrasonic wave is decreased inversely as the density increased.

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References

  1. Panakkal, J.P. and Willems, H. 1989, “Nonde-Structive Monitoring of Fabrication Parameters of Sintered Iron Power Compacts using Ultrasonics," NDT ＆ E International, Vol. 22, pp. 273-276 https://doi.org/10.1016/0308-9126(89)91431-4
  2. Ryu, H. J., Kang K. H., Moon, J. s., Song, K. C., Jung, H, K, and Cheong, Y. M., 2004, “Elastic Modulus Measurement of a Dry Process Fuel Pellet by Resonant Ultrasound Spectroscopy,” Journal of Korean Powder Metallurgy Institute, Vol. 11, pp. 314-321 https://doi.org/10.4150/KPMI.2004.11.4.314
  3. Cech, J., 1990, "Measuring the Mechanical Properties of Cast Irons by NDT Methods," NDT ＆ E International, Vol. 23, pp. 93-102
  4. Orlowicz, W. and Opiekun, Z. 1995, "Ultrasonic Detection of Microstructure Changes in Cast Iron," Theoretical and Applied Fracture Mechanics, Vol. 22, pp. 9-16 https://doi.org/10.1016/0167-8442(94)00043-Z
  5. Kopec, B. and Hanak, V., 1989, "Ultrasonic Attenuation in Quenched Railway Wheels," NDT ＆ E International, Vol. 22, pp. 21-25 https://doi.org/10.1016/0308-9126(89)91278-9
  6. Generazio, E. R., 1986, "Scaling Attenuation Data Characterizes Changes in Material Microstructure," Materials Evaluation, Vol. 44, pp. 198-202
  7. Klinman, R. and Stephenson, E. T., 1981, "Ultrasonic Prediction of Grain Size and Mechanical Properties in Plain Carbon Steel," Materials Evaluation, Vol. 39, pp. 1116-1120
  8. Hong, J. M., Son, H. T., Chang, S. H., Lee, J. S., Cha, Y. H., and Oh, I. H, 2007, “Characteristics of Pure Mg Powder Compacts Prepared by Spark Plasma Sintering Process,” Kor. J. Matter. Res, Vol. 17, pp. 331-336 https://doi.org/10.3740/MRSK.2007.17.6.331
  9. Norimitsu Hirose, 2001, "超音波パルス法を用いた 燒結鐵の評價", 超音波TECHNO, pp.47-50
  10. Jeong, H. J., 2005, “Analysis of Ultrasonic Scattering Fields by 2-D Boundary Element Method and Its Application,” KSME Journal, Vol. 29, pp.1439-1444 https://doi.org/10.3795/KSME-A.2005.29.11.1439
  11. J and KrautKramer, H., 1990, "Ultrasonic Testing of Materials," Springer-Verlag, pp. 528-550
  12. Albert S. Birks, 1991, "Ultrasonic Testing," American Society for Nondestructive Testing, pp. 365-421