Experimental strain-based vibration control to obtain the fatigue strain limit by the staircase method

摘要

This study is a combination of constant amplitude fatigue experimental tests with strain control technique and staircase method to assess the fatigue strain limit (FSL). The strain control provides a dwell-fatigue test to the failure by a strain gauge bonded to the reduced section center of the specimen. A staircase test procedure with a vibration bending bench is detailed in this work, including parameters selection. The result analysis is based on kernel density estimation, used to access the FSL on non-parameter distribution. Low-carbon steel specimens with fatigue zone were selected to evaluate the FSL statistical features. The results highlight the efficiency of the strain-controlled staircase method to reach the FSL.