Determination of Elastic Modulus of Short Random Glass Fiber Reinforced Polyester Composite with Pulse-Echo Method Ultrasonic Testing
<p align="justify">Fiber-reinforced polymer composites are commonly used in structural components and chemical resistant reinforcement layers. One of the most commonly used polymer composites is a short random glass fiber reinforced polyester composite. FRP composites can be degraded...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/29294 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | <p align="justify">Fiber-reinforced polymer composites are commonly used in structural components and chemical resistant reinforcement layers. One of the most commonly used polymer composites is a short random glass fiber reinforced polyester composite. FRP composites can be degraded which will have an impact on elastic properties whereas it represented by the modulus of elasticity. Knowledge and determination of elastic modulus could be used to predict remaining lifetime of composite. The theoretical modulus of elasticity can be determined by ultrasonic testing. It is more favorable due to nondestructive test, Ultrasonic test had been carried out for composites to determine thickness and defects. The echo pulse method is superior than through transmission method on-site applications. This study aim to detemine elastic modulus of short random glass fiber reinforced polyester composites. Three random fiber composites with different fiber volum fraction manufactured by lay-up and compression. The study began by evaluating probe of 12.7 mm 1,5 MHz with and without delay line.Result showed that probe with delay line suitable to be used to determine ultrasonic velocity for thickness minimum of 15 mm.Then evaluation the effect of fiber volume fraction and anisotropic properties to the acquired ultrasonic velocities were done. Results showed that ultrasonic test pulse-echo emethod could be used to see the effect of fiber volum fraction and anisotropic to the ultrasonic velocities. Elastic modulus were determined by using the longitudinal ultrasonic velocities. Results showed that the elastic modulus obtained this way still contained errors up to 28%. Errors were caused by combination of density and attenuation. The relation betweeen attenuation factor and elastic modulus errors showed that errors of ultrasonic relatively equal with increasing attenuation factor. It is predicted that there were another factor contributing to the errors other than attenuation in short random glass fiber reinforced polyester composite.<p align="justify"> |
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