Institute of Physics of Materials AS CR, v. v. i. > Projects > Novel principles for life prediction in variable loading of components
Novel principles for life prediction in variable loading of components
| Investigator | prof. RNDr. Jaroslav Polák, DrSc., dr. h. c. |
| Number of Project | 101/07/1500 |
| Agency | Grantová agentura České republiky |
| Duration | 2006-12-31 - 2009-12-30 |
Anotace |
| Existing methods for life prediction of components are often not reliable and high safety factors must be used. Recent research into fatigue damage of structural materials revealed new possibilities to evaluate the fatigue life based not only on the stress amplitude but on the plastic strain amplitude. It is important to use a differential characteristic, the growth rate of short cracks Within a proposed project new findings concerning the effect of plastic strain amplitude and mean stress will be obtained. The rates of short cracks will be measured and the kinetics of short crack growth for various values of plastic strain amplitudes and mean stresses will be established. Simultaneously the fatigue life of smooth specimens cycled with various plastic strain amplitudes and mean stresses will be determined and correlated with the rates of short crack in order to propose more simple evaluation of relevant parameters. |
