Arif Basuki
In principle, ultrasonic examination, which depends on elastic and material density, can be used to determine the modulus of elasticity. Ultrasonic tests with translucent transmission methods have been made to determine the modulus of elasticity and dynamic elasticity modulus for polymers. Ultrasonic testing is done with GE USM 35X devices which are pulse-echo methods and also types of ultrasonic testing machine contact methods. Experiments are carried out on several types of polymers with frequency and thickness as experimental parameters. With input thickness specimens, sound speed material (?) Can be obtained, so the results? calculated to achieve the modulus of elasticity. Comparison between the results of ultrasonic testing and the results of the mechanical testing of the modulus of polymer elasticity is carried out to analyze data. In this study the modulus value of the elasticity obtained from ultrasonic testing has a very large error of 65% and 388%, especially for polymer with very low density. Further research must be done because of the effects of attenuation. Also, the lower frequency of probes facilitates ultrasonic wave detection back and forth. The thickness of the specimen adjusted to the calculation of close fields can eliminate close field effects, which are natural phenomena of ultrasonic waves. However, the resulting value is inaccurate because excessive thickness will provide a damping effect.
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