Moubarak, D., Ayoub, H., El-Sharif, A., Hassan, H., Khairy, S., Rasasi, T. (2018). Investigation Internal Friction of High Elasticity Solids using Laser Shadowgraphy. test, 9(International Conference on Mathematics and Engineering Physics (ICMEP-9)), 1-8. doi: 10.21608/icmep.2018.29594
Deia l. Moubarak; Hany S. Ayoub; Ashraf F. El-Sharif; H. H. Hassan; S. A. Khairy; T. Y. Rasasi. "Investigation Internal Friction of High Elasticity Solids using Laser Shadowgraphy". test, 9, International Conference on Mathematics and Engineering Physics (ICMEP-9), 2018, 1-8. doi: 10.21608/icmep.2018.29594
Moubarak, D., Ayoub, H., El-Sharif, A., Hassan, H., Khairy, S., Rasasi, T. (2018). 'Investigation Internal Friction of High Elasticity Solids using Laser Shadowgraphy', test, 9(International Conference on Mathematics and Engineering Physics (ICMEP-9)), pp. 1-8. doi: 10.21608/icmep.2018.29594
Moubarak, D., Ayoub, H., El-Sharif, A., Hassan, H., Khairy, S., Rasasi, T. Investigation Internal Friction of High Elasticity Solids using Laser Shadowgraphy. test, 2018; 9(International Conference on Mathematics and Engineering Physics (ICMEP-9)): 1-8. doi: 10.21608/icmep.2018.29594

Investigation Internal Friction of High Elasticity Solids using Laser Shadowgraphy

The International Conference on Mathematics and Engineering Physics
Article 16, Volume 9, International Conference on Mathematics and Engineering Physics (ICMEP-9), April 2018, Pages 1-8    PDF (1.41 M)
Document Type: Original Article
DOI: 10.21608/icmep.2018.29594
Authors
Deia l. Moubarak1; Hany S. Ayoub2; Ashraf F. El-Sharif3; H. H. Hassan2; S. A. Khairy2; T. Y. Rasasi4
1Basic Science Department, Thebes High Institute of Engineering Cairo 11434, Egypt.
2Department of Physics, Faculty of Science, Cairo University, Egypt.
3Laser Photonics Research Center, Engineering Physics Department, Military Technical College, Cairo, Egypt.
4Physics Department, Faculty of Science, Benha University, Egypt.
Abstract
Abstract:
This paper discusses a non-contact method for measuring the internal friction of high elasticity solid materials using pulse excitation technique. The measured sample is prepared in form of 200mm long string, having a homogenous circular cross section of 3mm wide. A mechanical pulse is delivered to the fixed- fixed end sample by mean of a punch from a small solenoid motor plunger. A laser beam is used to generate a shadowgraph for the vibrating sample on an silicone photodiode. The obtained electric signal is fed to a storage oscilloscope to capture the natural resonance amplitude decay profile of the tested sample. The internal friction is obtained by mathematical analysis of the acquired data. This method is reliable, low cost, and accurate and suiting a wide variety of rubbery materials and elastomers. It is intended to alternate the torsion pendulum method that suites only low elasticity materials that resists creep under pendulum weights.
Keywords
Dynamic elasticity; internal friction; pulse excitation technique; laser shadowgraphy; low cost; non-Doppler laser vibrometry
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