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Title: Influence Of Shot Peening Onthe Cyclic Deformation Behaviour Of The Steel 42 Crmo 4 In A Normalized State
Author: Ebenau, Eifler, Vohringer, Macherauch
Source: Conf Proc: ICSP-4, (p.337-346)
Publication year 1990
Document number: 1990039
Number of pages: 10
Abstract:
The cyclic stress-strain behaviour of a normalized 42 CrMo 4 (A1S1 4140) was investigated under push-pull and cyclic bending loading (R = -1). For push-pull loading
cylindrical specimens were used. The cyclic bending was realized with flat specimens. The push-pull tests were carried out under stress as well as total-strain control.
Cyclic bending was performed under total-strain control.
T
he differences in the cyclic deformation curves [E(a,p)-N-curves]
of unpeened and shot peened specimens are significant. For N > 19 cycles, the plastic strain amplitudes of shot peened specimens are smaller than those of unpeened ones.
As a consequence, the number of cycles to crack initiation and failure for shot peened specimens increases in push-pull as well as cyclic bending tests. For the different
kinds of loading, the cyclic stress-strain curves are presented and compared. In this context, the changes of the macro residual stresses as a function of the number of
cycles are discussed. The influence of the type of loading (push-pull or cyclic bending) on the E(a,p)-N-curves and the cyclic stress-strain curves, respectively, are also
modelled and discussed.
Descriptors: Push-pull test; Cyclic bending test; Stress-control; Total strain-control; Cyclic deformation curves; Cyclic stress-strain-curves; Macro residual stresses
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