New technique for measuring the dynamic Young's modulus between 295 and 6 K

✍ Scribed by J. Zhang; A. Nyilas; B. Obst

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 586 KB
• Volume: 31
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(91)90022-o

✦ Synopsis

A transducer system based on strain gauge technology was developed and applied to bar type specimens to determine the dynamic Young's modulus. The system was installed in a continuous flow cryostat working in the temperature range 295-6 K. The adapted technique is the remote mechanical excitation of the bar as a cantilever beam and the on-line determination of the fundamental free vibration frequency using a commercially available electronic instrument. This simple and economic method is able to measure the material's dynamic Young's modulus, E, and shear modulus, G, with a high degree of accuracy (error < 4-2.0%). The Poisson's ratio, p, can therefore be determined, according to the measured values of E and G. Six different engineering materials were characterized with respect to their elastic properties between 295 and 6 K. The dynamic Young's modulus versus temperature measurements were compared with the results of static stressstrain measurements carried out in the same test facility.