Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
A FAST ROTATING BENDING FATIGUE TEST MACHINE
Submission Author:
Rodrigo de Moura Nogueira , RJ , Brazil
Co-Authors:
Marco Antonio Meggiolaro, Jaime T P Castro, Rodrigo de Moura Nogueira
Presenter: Rodrigo de Moura Nogueira
doi://10.26678/ABCM.COBEM2017.COB17-1824
Abstract
This paper presents the design and development of a fast rotating bending test machine for high-cycle fatigue tests, which can rotate up to 18,000 rpm, generating cyclic stresses at 300 Hz. The bending force is applied by an electric actuator, connected in series with a load cell. An Arduino board with a DC motor controller shield receives the force feedback from the load cell, commanding the actuator to create the desired bending moment through proportional-integral (PI) controller logic. It also commands the desired rotation speed for the main motor via a PWM signal to the brushless motor speed controller. Another Arduino board is connected to a Hall-effect sensor, to count the revolutions and to control the speed of the main motor. All data can be captured by a computer, via a USB connection. Pairing the bending stress and number of cycles for failure creates a point for traditional stress-life plots, but due to its active feedback, the machine can also apply load blocks needed for Gassner curves and even to simulate variable amplitude loads. The design is versatile, can apply stresses up to 3000 MPa, is lightweight and portable, and costs a fraction of standard commercial models.
Keywords
fatigue, mechanical testing machine, SN method, Variable Load, Instrumentation, Machine design
