T héo Sévédé

IRDL, Brest, France



For several years, research teams have been interested in characterizing HCF properties from self-heating tests. This method reduces the time and cost of characterizing the fatigue properties of materials. It is based on temperature monitoring of the specimen during cyclic loading.

This method has been widely studied and validated at room temperature and at low frequency on many materials. However, the application of this method to high frequency tests requires the development of a new approach. Indeed, the particular conditions of the high frequency test at the geometrical, thermal and mechanical level makes the classical 0D approach impossible and forces to use a 1D approach.

An experimental protocol was therefore set up to perform self-heating tests on a high frequency VHCF machine as well as a numerical model of the test in order to test different virtual test configurations. The objective of the study is to adapt the self-heating method for high frequency solicitations in order to determine the VHCF properties of different metals, to be able to relate these measurements to failure mechanisms and to know how the high frequency thermal signature can help us to better understand and model the VHCF properties of metals.



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