Vol. 23 No. 3 (2020) Cover Image
Vol. 23 No. 3 (2020)

Published: November 30, 2020

Pages: 232-237

Articles

Effect of Elevated Temperature on Bending Fatigue Behavior for Neat and Reinforced Polyamide 6,6

Orhan Sabah Abdullah 1 Shaker S. Hassan 2 Ahmed N. Al-khazraji 3
1 Mechanical Engineering department/ University of Technology
2 Mechanical Engineering Dept., University of Technology, Baghdad-Iraq.
3 Mechanical Engineering Dept., University of Technology, Baghdad, Iraq.
History
  • Received: February 20, 2020
  • Revised: March 26, 2020
  • Accepted: July 16, 2020
  • Available Online: November 24, 2020
DOI

https://doi.org/10.29194/NJES.23030232

Abstract

Recently, considering polymer composite in manufacturing of mechanical parts can be caused a fatigue failure due to the very long time of exposure to cyclic loading and may at environmental temperatures higher than their glass transition temperature; therefore, in this paper, a comprehensive investigation for bending fatigue behavior at room and elevated temperatures equal to 60 °C, 70°C, and 80 °C will be done. Rotating bending test machine was manufactured for this purpose supplied with a connected furnace to perform fatigue tests at elevated temperatures. The obtained results appeared that the increase in applied stress and temperature caused a clear reduction in fatigue life; also the addition of carbon nanotubes enhanced the fatigue life at different temperatures by 183%, 205%, 218%, and 240%, respectively while the addition of short carbon fibers improved fatigue life by 324%, 351%, 387%, and 415%, respectively. As well as, Polyamide 6,6/carbon fiber composite appeared fatigue limit at temperatures equal to 20°C and 60°C and stresses approximately equal to 55 MPa and 38 MPa respectively.

Keywords

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