Institute of Physics of Materials AS CR, v. v. i. > Projects > Fatigue life and residual fatigue life assessment based on the kinetics of short crack growth

Fatigue life and residual fatigue life assessment based on the kinetics of short crack growth

Investigatorprof. RNDr. Jaroslav Polák, DrSc., dr. h. c.
Number of Project106/02/0584
AgencyGrantová agentura České republiky
Duration2001-12-31 - 2004-12-30

Anotace
The goal of the present project is to propose a new life assessment method. For this purpose the kinetics of short crack growth in selected materials and under well-defined loading conditions is studied in order to find quantitative description of the short crack growth. The fatigue crack kinetics is studied on specimens cycled with different stress and plastic strain amplitudes from its initiation until the stage of a macrocrack growth. The effect of surface defects (inclusions, pores, etc.) is also considered. The parameters characterising the short crack growth will be established. These parameters will be used in proposing a new method of fatigue and residual fatigue life assessment. Simultaneously, the life curves (Manson-Coffin and Wöhler curves) of the materials will be measured and the results of the prediction method will be compared with actual fatigue life allowing the verification of the proposed method.

2005

Polák J.: Plastic strain-controlled short crack growth and fatigue life. Int. J. Fatigue 27 (2005) 1192-2001

Polák J.: Cyclic plastic response and fatigue life of duplex and superduplex stainless steel. Kovové materiály 43 (2005) 280-289


2003

Polák J., Man J., Obrtlík K.: AFM evidence of surface relief formation and models of fatigue crack nucleation. Int. J. Fatigue 25 (2003) 1027-1036