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|Title:||Impact of high-pressure gaseous hydrogen on the fatigue behaviour of austenitic steel A-286 under asymmetric loading conditions|
|Authors:||BRUCHHAUSEN MATTHIAS; FISCHER Burkhard; RUIZ MORENO ANA MARIA; HAEHNER Peter; SOLLER Sebastian|
|Citation:||KEY ENGINEERING MATERIALS vol. 664 p. 156-167|
|Publisher:||TRANS TECH PUBLICATIONS LTD|
|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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