Hany Sabry Ayoub Mohamed <br/><br/>
Investigation of tungsten elasticity at elevated temperatures using laser shadow vibrometry /  
 تعن مرونة التنجستن عند درجات الحرارة العالة باستخدام قاس اھتزاز ظل اللزر  
Hany Sabry Ayoub Mohamed ; Supervised Hussam Eldin H. Hassan , Sherif A. Khairy 
 - Cairo :   Hany Sabry Ayoub Mohamed ,   2020 
 - 213 P. :   charts , facsimiles ;   25cm  
<br/><br/>Thesis (Ph.D.) - Cairo University - Faculty of Science - Department of Physics 
<br/><br/> This thesis introduces the design and construction of a novel low-cost laser vibrometry based on shadowgraphy, used to investigate the dynamic elasticity of tungsten at elevated temperatures. For this purpose, a filament sample was subjected to impulse excitation technique. The system was exclusively successful in measuring the dynamic elastic moduli of commercial-grade tungsten from room temperature up to near the melting point. Experimental conditions and parameters were studied to achieve best measurement accuracy and good matching between measured and published data 
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<br/><br/><label>Subjects--Index Terms: </label>Dynamic elasticity  Elevated temperatures  Tungsten