Conclusions
Fatigue failure of rolled high-porosity materials based on copper, tested in the conditions of resonance oscillations,is accompanied by a considerably slower drift of the resonance frequency (lower rate of fatigue damage) then failure of dense copper.
The relative variation of the resonance frequency can be used to evaluate the residual endurance of the porous materials and also as a fatigue strength criterion.
In bending, the dense and low-porosity materials fail under the effect of normal stresses, whereas high-porosity materials fail under the effect of shear stresses.
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A. V. Vdovichenko, V. A. Kuz'menko, Yu. F. Lugrovskoi, and V. A. Nazarenko, “Fatigue resistance of rolled porous materials based on copper fibers in high-frequency cyclic loading,” in: Proceedings of All-Union Conference ‘Strength of Materials and Structural Members at Sonic and Ultrasonic Loading Frequencies,’ [in Russian], Kiev (1988).
A. G. Trapezon and Yu. F. Lugovskoi, “Method of fatigue testing materials under transverse bending,” Inventor's Certificate No. 1231429, USSR, Otkr. Izobret., No. 18, 201 (1986).
V. A. Kuz'menko (ed.), Fatigue Test at High Loading Frequencies [in Russian], Naukova Dumka, Kiev (1979).
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Translated from Poroshkovaya Metallurgiya, No. 1(337), pp. 96–99, January, 1991.
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Vdovichenko, A.V., Lugovskoi, Y.F. & Nazarenko, V.A. Fatigue failure of rolled high-porosity materials made of copper fiber at resonance bending oscillations. Powder Metall Met Ceram 30, 87–89 (1991). https://doi.org/10.1007/BF00793410
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DOI: https://doi.org/10.1007/BF00793410