Evolution of Some Structural Fine Parameter in the Superficial Layer during Low Cycle Fatigue Process
Abstract
Using laminate samples, investigations have been realized at variable solicitation of pure bending on a patented machine. The machine has two working places and it can be adjusted for different deformations, frequencies and number of cycles. The tests have developed in a symmetrical alternative regime at two frequencies. In this paper some results concerning the evolution of the crystalline lattice parameter, level of the texture were realized in steps of each two thousand cycles until a limit of 104 cycles. The X-ray diffraction method was used and information on the ferrite phase was obtained. The crystalline lattice parameter presents a decreasing tendency when the number of the fatigue cycles increase. This decreasing in jumps occurs. During fatigue tests at high testing frequencies, an increasing texture process is displayed, but at small fatigue testing frequencies, increasing and decreasing texture processes occur. Experimental data allows to estimate the history of the sample and its behavior in fatigue process.
Downloads
References
[2]. C. Gheorghies, 1990, Control of fine structure of metal by Xrays, Ed. Tehnica, Bucuresti p. 128.
[3]. Buzdugan, Gh., Blumenfeld, I., 1979, Calculul de rezistenţă al organelor de maşini, Ed. Tehnică Bucureşti.
[4]. Bogatet, K. Budaci, T., Sovremennie sredstva dlia ispîtanii na maloticlovaia ustalosti, Laboratoria nr. 7/1980 p. 654-658.
[5]. Crudu, I., Măcuţă, S., 1991, Maşină universală de încercat materiale, Brevet de invenţie nr. 102714/1991.
[6]. Fouquet, I., Dislocations et deformation plasique, Ecole d’ été d’Yravals, Paris 1979.
[7]. Karpenko, G., Katov, K.B., Kokotailo, I.V., Rudenko, V.P., 1977, Maloticlovaia ustalosti stali v rabocih sredah, Kiev.
[8]. Lieurade, M.P., 1987, La rupture par fatigue des aciers, Collection IRSID OTUA- Propriétés d’emploui des aciers- études de base, Paris.
[9]. Mocanu, D.S., 1982, Incercarea materialelor, vol I-II, k, Ed. Tehnică Bucureşti.
[10]. Puskar, A., 1989, Microplasticity and failure of metalic materials Bratislava.
[11]. Strijala, V. A., 1987, Malotiklovaia ustalosti pri nizkih temperaturah, Kiev.
[12]. Troscenoko, V. T., 1985, Ticliceschie deformatii I ustalosti metalov, vol. I, Kiev.
[13]. C. Gheorghies, 1990, Control of fine structure of metal by Xrays, Ed. Tehnica, Bucuresti 128.
[14]. S. Macuta and C. Gheorghies, 1998, Proc. 15-th Symposium “Danubia-Adria,”Sept. 30-Oct. 3, Bertinoro, Italy, 59.
[15]. S. Macuta and I. Crudu, 2000, The Annual Symposium of The Institute of Solid Mechanics, SISOM 2000, Bucharest, October 26-27 19.
[16]. S. D. Macuta, C. I. Gheorghies and I. Crudu, Proc.2-nd ESAFORM Conf. on Mat. Forming , Guimaraes, Portugal (1999) 199.
