The DISFAT project is a ongoing French project financially supported by the French National Agency ANR.It aims at a deeper understanding of mechanisms leading to crack initiation in ductile metals in Very High Cycle Fatigue (VHCF).The VHCF regime is associated with stress amplitudes lower than the conventional fatigue limit and numbers of cycles higher than 109.Tests were conducted using an ultrasonic technique at loading frequency of 20 kHz.The mechanisms leading to crack initiation express via slip bands at the specimen surface and self-heating due to intrinsic dissipation.Thermal maps were used to estimate the mean dissipation and its change with number of cycles and stress amplitudes in case of pure copper polycrystals.At the same time,the surface relief changes due to plasticity were characterized using optical and scanning electronic microscopes.A good correlation was found between slip band initiation and dissipation.Dissipation and slip band amount always increased over the number of cycles.At very small stress amplitudes,no slip band appeared up to 108 cycles but the material was found to dissipate energy.These results reveal that the material never reached a steady state.Therefore it could break at higher number of cycles.
copper self-heating slip bands IR thermography ultrasonic fatigue
Ngoc Lam Phung Claude Bathias Fabienne Grégori Brigitte Bacroix Ha(e)l Mughrabi Guillaume Thoquenne Antoine Blanche Nicolas Ranc Véronique Favier André Chrysochoos Nicolas Marti Nicolas Saintier Chong Wang Danièle Wagner
Arts et Métiers ParisTech,PIMM UMR 8006,75013 Paris,France Paris 10 University,LEME,France Paris 13 University LSPM UPR 3407,France 6Erlangen University,Germany Cetim,Senlis,France Montpellier II University,LMGC UMR 5506,France Arts et Métiers ParisTech,PIMM UMR 8006,75013 Paris,France;Arts et Métiers ParisTech,I2M UMR 8006,33 Arts et Métiers ParisTech,I2M UMR 8006,33607 Bordeaux,France