The applied force is captured on the digital display along with the revolution count of the specimen. Both values can be reset and zeroed (tared) prior to the testing commencing. When failure occurs, a microswitch stops the motor and the cycles to failure are registered on the digital display. A 2800rpm motor rotates a specimen through a gear and pulley arrangement between 5600 or 1425 rpm. The specimens are held within chucks and loaded using a cantilever arrangement, with the load being applied through a screw jack mechanism with integral cantilever load cell. This Rotating Fatigue Machine Digital Apparatus has been designed to introduce students to the effects of material fatigue using a sinusoidal variation of bending stress. The count remains when the motor is not running and the ability to reset the counter has been designed in. Through an appropriate spreadsheet software printing and manipulation of data can be completed.Specially machined necked test specimens are provided in steel. A safety guard shields all rotating parts. The digital display incorporates a usb socket, which allows a host computer to be connected to the. The software supplied with the allows the capture and reviewing of data. These have a 4mm nominal neck diameter and are held in the unit using collect chucks. All tooling is provided to allow the removal and fitting of these specimens.
Experimental Capabilities:
Introducing students to s-n curvesMaterial specification on fatigue limits
Specimen geometry on fatigue limit
To make an introductory study of fatigue using a wohler rotating fatigue apparatus, including the time to failure caused by various stress levels and materials
The accessory affords bending fatigue of a cantilevered strip of metal or plastic in modes varying from alternating to fluctuating stresses
