Abstract
Attenuation of ultrasonic waves was measured in different notched specimens of Poly(methylmethacrylate) (PMMA) at different points of crack propagation path. Crack propagation takes place when specimens, with initial single edge notch produced using sharp milling cutter, are subjected to different crosshead speeds of a tensile testing machine. These measurements were performed on specimens having different thicknesses by using pulse echo technique at different frequencies. Attenuation measurements results were confirmed by microscopic images. The present study showed that attenuation increases when crack propagation speed increases as a result of an increment of crosshead speed of the applied load. Such relation is not affected by the specimens' thickness. The resulting attenuation curves elucidated the neck zone of the crack.
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