The Stress-Strain Behaviour of IN738LC under Thermomechanical Uni- and Multiaxial Fatigue Loading

Isothermal and thermo-mechanical fatigue behavior of the nickel base superalloy Waspaloy™ under uniaxial and biaxial-planar loading

“…Results of Brookes et al [14][15][16], Meersmann et al [17,18] and Ogata [19] show that the fatigue lives for the proportional loading coincide with the uniaxial data. In the case of non-proportional loading lower number of cycles to failure was measured due to stronger hardening by slip system interactions and the associated fatigue damage.…”

“…Literature data of thermo-mechanical fatigue tests at a the tension-torsion testing rig according to Brookes et al [14][15][16], Ogata [19] and Meersmann et al [17,18] confirm that the distortion energy hypothesis according to von Mises is suitable for proportional thermo-mechanical in-phase loading to give a fatigue life correlation. However, a multiaxial test corresponding to the biaxial-planar equibiaxial IP TMF test could not be realized so far by the tension-torsion testing rig because of necessary internal and external pressure on the cylindrical specimen.…”

“…At the biaxial-planar testing system, isothermal and thermo-mechanical fatigue tests at different stress states were successfully carried out. Besides tensiontorsion testing devices [14][15][16][17][18][19], the presented biaxial-planar testing facility is a further test rig, which is able to perform a biaxial thermo-mechanical fatigue test. To our knowledge this is the first presentation of a suitable biaxial-planar testing facility for thermo-mechanical loading which met the code of practice for TMF.…”