Complex Thermo-Mechanical Approaches to Study the Behavior of High-Temperature Alloys


V. Bonnand, D. Pacou (ONERA)

The work discusses the complex thermo-mechanical approaches developed at
ONERA within the context of gas turbine component fatigue tests. Emphasis is
placed on the general experimental methods to test nickel-based single crystal superalloys used in gas turbine blades under severe thermal and mechanical conditions. First, the successive steps required in combined thermal and mechanical fatigue testing are briefly discussed. Particular focus is placed on the techniques developed to reliably control and measure temperature fields generated by induction heating. The main experimental techniques used for thermo-mechanical testing are then discussed. Here, an axial-torsional thermo-mechanical fatigue (TMF) testing rig used to study the coupling effects of combined thermal and mechanical loads is described. How a