DEVICE FOR TESTING THE RESISTIVITY AGAINST ROLLING FATIGUE OF MATERIALS WITH OPTIONAL INTERRUPTS

摘要

This improved device for testing the resistivity to rolling fatigue of materials provides the possibility of interruptions and later continuation of the test from an exactly defined previous state.- This is not possible with currently known devices. When testing rolling fatigue of materials the surface of the test sample (20) is subject to certain strain and rolling of the test sphere (10) with a certain number of repetitions, while between the specified sphere (10) and the test sample (2) surface (20) a point-to-point fitting is provided. The device includes a not shown driving assembly to which a moving pressuring unit (1) equipped with the test sphere (10) is attached which can be rolled along the test surface (20) of each test sample (2) held by a fastening device (3). The specified pressuring unit (1) is equipped with a limiting panel (14) marking and repeatedly determining at least one end of rolling point of the test sphere (10). Besides the holding unit (3) is equipped with a fastening nest (31) to hold the test sample (2) and along which there are sliding supports (32) inside corresponding grooves (34) with loose fit. They can be fastened in a certain position and by this the involuntary moving along the corresponding groove (34) is disabled