Article
?
AI-assigned paper type based on the abstract. Classification may not be perfect — flag errors using the feedback button.
Tier 2
?
Original research — experimental, observational, or case-control study. Direct primary evidence.
Food & Water
Policy & Risk
Sign in to save
Very high cycle fatigue for single phase ductile materials: Microplasticity and energy dissipation
Gruppo Italiano Frattura Digital Repository (Gruppo Italiano Frattura)2014
Score: 20
?
0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.
Ngoc-Lam Phung,
Ngoc-Lam Phung,
Ngoc-Lam Phung,
Claude Bathias,
Nicolás Martí,
V. Favier,
Ngoc-Lam Phung,
Antoine Blanche,
Nicolás Martí,
Claude Bathias,
Antoine Blanche,
Ngoc-Lam Phung,
Ngoc-Lam Phung,
Ngoc-Lam Phung,
Claude Bathias,
V. Favier,
Antoine Blanche,
Antoine Blanche,
Danièle Wagner,
Claude Bathias,
Danièle Wagner,
Ngoc-Lam Phung,
Ngoc-Lam Phung,
V. Favier,
Ngoc-Lam Phung,
Antoine Blanche,
Ngoc-Lam Phung,
Nicolas Ranc,
Antoine Blanche,
Antoine Blanche,
Nicolas Saintier,
V. Favier,
Nicolas Saintier,
Antoine Blanche,
Antoine Blanche,
Antoine Blanche,
Antoine Blanche,
André Chrysochoos,
André Chrysochoos,
Nicolas Ranc,
Ngoc-Lam Phung,
Antoine Blanche,
Antoine Blanche,
Antoine Blanche,
Antoine Blanche,
Antoine Blanche,
Nicolás Martí,
Brigitte Bacroix,
Nicolas Ranc,
Nicolas Ranc,
Nicolas Ranc,
Claude Bathias,
Brigitte Bacroix,
Nicolas Ranc,
Nicolas Ranc,
Nicolás Martí,
Claude Bathias,
Nicolas Ranc,
André Chrysochoos,
V. Favier,
V. Favier,
Nicolas Ranc,
Nicolas Ranc,
Danièle Wagner,
Danièle Wagner,
André Chrysochoos,
V. Favier,
V. Favier,
Nicolas Ranc,
André Chrysochoos,
André Chrysochoos,
André Chrysochoos,
V. Favier,
Nicolás Martí,
Nicolas Saintier,
Danièle Wagner,
Nicolas Ranc,
Danièle Wagner,
V. Favier,
Nicolás Martí,
Claude Bathias,
Claude Bathias,
Claude Bathias,
Chao Wang,
Claude Bathias,
André Chrysochoos,
Claude Bathias,
André Chrysochoos,
Fabienne Grégori,
Danièle Wagner,
Danièle Wagner,
Chao Wang,
Claude Bathias,
Brigitte Bacroix,
Guillaume Thoquenne
Fabienne Grégori,
Claude Bathias,
Claude Bathias,
BACROIX, Brigitte,
MUGHRABI, Haël,
THOQUENNE, Guillaume,
André Chrysochoos,
Antoine Blanche,
Antoine Blanche,
Fabienne Grégori,
Fabienne Grégori,
Brigitte Bacroix,
Guillaume Thoquenne
Summary
This French research project investigated the mechanisms of fatigue crack initiation in ductile metals at very high cycle fatigue (VHCF) conditions — stress levels below the conventional fatigue limit at cycle counts exceeding one billion. Understanding VHCF failure is important for long-lived components in aerospace and automotive applications.
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.