Journal of Applied Mechanical Engineering

Experimental fatigue analysis and investigation of optimal-angle ply orientation of composite tubes under variable cyclic loading

4^th International Conference and Exhibition on Mechanical & Aerospace Engineering

October 03-04, 2016 Orlando, USA

Fuat Okumus

Gediz University, Turkey

Scientific Tracks Abstracts: J Appl Mech Eng

Abstract:

In this study, optimal angle-ply orientation of symmetric composite tubes under fatigue loading is investigated. The fiber-reinforced plastic tubes were manufactured from S-glass/polyester. The layers were manufactured symmetrically in [750]2, [600]2, [500]2, and [450]2 orientations. Burst pressure of filament-wound composite tubes under alternating pure internal pressure was measured experimentally. Internal fatigue pressure testing method was applied to the composite tubes in close-ended condition. For this study, a Programmable Logic Controlled (PLC) hydraulic pressure testing machine has been employed. The static burst pressure values of specimens were measured; subsequently, fatigue test pressure was applied in 75, 60, and 50% stress levels of burst pressure for each orientation. Damage propagations of the composite tubes on these stress levels were observed as whitening, leakage and final failure for [600]2, [450]2 orientations. When the damage propagation of [750]2 angle-ply tubes was observed, whitening and leakage did not occur and final failure occurred suddenly. Stress-cycle curves obtained from the tests are given in graphics. Experimental results reveal that variation in stress levels and the winding angles have considerable effects on final failure cycles, which is also presented graphically.

Biography :

Fuat Okumus has completed his PhD from Firat University and Post-doctoral studies from TSK School of Engineering. He is the Director of Mechanical Engineering at Gediz University. He has published more than 16 papers in reputed journals.

Email: fuat.okumus@gediz.edu.tr