Title: Impact of high-pressure gaseous hydrogen on the fatigue behaviour of austenitic steel A-286 under asymmetric loading conditions
Citation: KEY ENGINEERING MATERIALS vol. 664 p. 156-167
Publication Year: 2016
JRC N°: JRC93945
ISSN: 1013-9826
URI: http://www.scientific.net/KEM.664.156
DOI: 10.4028/www.scientific.net/KEM.664.156
Type: Articles in periodicals and books
Abstract: Ultrasonic techniques are an established means for carrying out fatigue tests at very high numbers of cycles. These techniques are based on the formation of a standing ultrasonic wave in the specimen and usually use frequencies around 20 kHz. Although such systems allow testing to a very high number of cycles in a relatively short time, the use of a standing wave for creating the strains restricts them to symmetric push-pull mode. This limitation can be overcome by coupling an ultrasonic test device to a universal test rig. In this work a different approach is presented that is particularly well suited for studying environmental effects. The load train with the specimen is enclosed in a pressure vessel. An acoustic horn divides this pressure vessel into two separate chambers. Applying a pressure difference between the two chambers then leads to a static stress in the specimen on which the oscillating stress from ultrasonic excitation is superposed. The addition of both stresses allows testing at varying R ratio. The deteriorating effect of high-pressure gaseous hydrogen on the steel A-286 is investigated as function of oscillating and static stresses at room temperature. SEM analysis of the fracture surface is presented.
JRC Directorate:Energy, Transport and Climate

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