A method for the strain rate dependent correction for control type of fatigue tests. (September 2020)

• Record Type: Journal Article
• Authors: Geilen, M.B.; Klein, M.; Oechsner, M.; Kaffenberger, M.; Störzel, K.; Melz, T.
• Is Part Of: International journal of fatigue. Volume 138(2020)
• Publication Date: 2020-09
• Subjects: Ultrasonic fatigue testing -- Frequency effect -- Control type effect -- 50CrMo4 -- SAE 4150; EMF electro-mechanical fatigue testing machine -- HCF High Cycle Fatigue -- LCF Low Cycle Fatigue -- USF ultrasonic fatigue testing machine -- VHCF Very High Cycle Fatigue -- VHF very high frequency servo-hydraulic testing machine; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2020.105726
• Languages: English
• ISSNs: 0142-1123

Abstract

Graphical abstract: Highlights: Fatigue tests under different control types yield different results. A method to eliminate this difference computationally is presented. An implementation of the method is presented. The algorithm is used on ultrasonic fatigue data. Agreement between ultrasonic fatigue test and conventional fatigue test improved. Abstract: In this paper, we investigate the influence of the control type of cyclic tests on the lifetime of the specimens tested. We present a strain rate dependent method to compare results of displacement controlled fatigue tests to results of force controlled fatigue tests. This method is successfully used to explain longer lifetimes observed in ultrasonic fatigue tests compared to conventional fatigue tests on specimens manufactured from quenched and tempered SAE 4150. This method may also be used to normalize displacement controlled fatigue tests in conventional testing, which allows parallel testing of multiple specimens in a single testing machine.