Engineering Transactions, 57, 2, pp. 113–123, 2009

Variation of mechanical parameters of engineering materials under tension due to cyclic deformation by torsion

Z. L. KOWALEWSKI
Institute of Fundamental Technological Research Polish Academy of Sciences; Motor Transport Institute

T. SZYMCZAK
Motor Transport Institute; Białystok Technical University Faculty of Mechanical Engineering

The paper presents experimental results of investigations carried out under complex stress
state on the 2024 aluminium alloy (used by aircraft industry) and P91 steel (used at power
plants). Second-order effects associated with cyclic loadings enforced by the trapezoidal signals
in the two mutually perpendicular directions are identified. It is shown, how the cyclic loading
and its parameters (strain amplitude and frequency) influence the simultaneous monotonic
loading in the direction perpendicular with respect to the cyclic one. Moreover, the paper
presents an analysis of the selected mechanical properties variations on the basis of an initial
yield locus evolution.
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