Effect of diameter on the critical speed of a composite shaft under dynamic load


Adil Abed Nayeeif, Hayder Abdual khaliq Ali, Fadhel Abbas Abdulla, Zahra Khalid Hamdan*


Mechanical Engineering department, Collage of Engineering, Mustansiriyah University, Baghdad- Iraq.

Corresponding Author Email: za.kalid89@uomustansiriyah.edu.iq

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

The effect of changing the shaft diameter on the dynamic load of the response system was investigated in this paper. Composite material columns (high polyester and fiberglass type) with a volume fraction of Vf = 40% was used in this work. Three composite samples are produced using a glass mold and a capillary tube using the injection process, with diameters of 6 mm, 9 mm, and 14 mm with constant length. The device used to measure critical speed was (TQTM1 system) with different boundary conditions. The results show that, first and second mode shape for all specimens except specimen (6 mm) diameter appearance third mode shape in value (106.63) Hz. The value of critical speed increase when transmission from first mode to second mode. appearance differed between experimental and theoretical values of critical speed. The critical speed depends on the state of fixed.