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Spatially resolved defect studies on fatigued carbon steel

: Eich, P.; Haaks, M.; Sindelar, R.; Maier, K.


Physica status solidi. C 4 (2007), Nr.10, S.3465-3468
ISSN: 1610-1634
ISSN: 1610-1642
ISSN: 1862-6351
International Conference on Positron Annihilation (ICPA) <14, 2006, Hamilton>
Zeitschriftenaufsatz, Konferenzbeitrag
Fraunhofer LBF ()

Several samples of the common ferritic tool steel AISI 1045 were fatigued in cyclic load tests. The local distribution of the Von-Mieses stress VM was simulated using the finite elements method (FEM). In the regions of interest, where VM reaches maximum values, the defect distribution was measured spatially resolved by Doppler-spectroscopy (DBAR) employing the Bonn Positron Microprobe (BPM). The lateral distribution of the S-parameter, which could be described by a simple model derived from linear fracture mechanics, corresponds well with the simulated Von-Mieses stress.