| Autor: |
Astle, Alicyn, Cutler, Collin, Pepi, Cameron, Maxwell, Trayson, Telford, Owen, Bishop, Jacob, Siahpush, Ali S. |
| Předmět: |
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| Zdroj: |
Journal of the Utah Academy of Sciences, Arts & Letters; 2021, Vol. 98, p111-124, 14p |
| Abstrakt: |
The modulus of elasticity is one of many properties used when predicting the behavior of materials. Accurate measurement of the modulus of elasticity is evaluated using precise measurements of elongation and stress. Commercial testing machines use extensometers and load cells to measure these values; however, these machines are very expensive for educational lab use. Jacob Bishop (Engineering faculty at Southern Utah University) has built several cost-effective universal testing machines with extensometers. The purpose of this project is to calibrate the extensometer to give accurate results of elongation. Multiple tensile tests were performed on steel tie wire using the universal testing machine on the calibrated extensometer. The average modulus of elasticity found was 25,220 ksi with a percent error of approximately 13%. Performing the test very slowly with a strain rate below 0.05 (in/in)/hr resulted in poor data. The recommended strain rate to perform tensile tests is from 1 to 2 (1/hr), and a motor can be incorporated with the testing machine to allow consistent movement of the crosshead during multiple tests. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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