TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
The Crack Growth as a Function of Loading Cycle’s Number, Established by Two Experimental Methods
(Utilizarea a două metode experimentale pentru stabilirea variaţiei lungimii fisurii în raport cu numărul ciclurilor de solicitare)
Vol LXVI • No. 4/2014
Viorel Goanţă, Marian Mareş, Bogdan Leiţoiu
Universitatea Tehnică “Gheorghe Asachi”, Bd. Mangeron, 57, Iaşi e-mail: vgoanta@tuiasi.ro

 Keywords   crack growth, cyclic loading, crack propagation gage

 Abstract
Two experimental methods are described, used for studying the crack length increase, in dependence with the loading cycle’s number. The basis for both methods is the tension test, applied on compact specimens of annealed OLC45 carbon steel. The first technique is using the specialized software on the computer of the testing machine, in order to establish the crack length propagation, by collecting the data from the machine loading cell, and also from the clip-on-gage extensometer that is attached on the compact specimen. For the second method, the experimental data on the crack length propagation are supplied by a dedicated crack propagation gage, provided by Vishay (Tk-09-CPB02-005/DP) and bonded in the vicinity of the initial small crack, initiated by fatigue. Finally, a comparison of the results obtained with the two methods is made; one can say that the advantage of the second method consists in its amenability for studying the crack growth rate on a real component, even without interrupting its working process.


 Rezumat
În lucrare sunt aplicate două metode de determinare a variaţiei lungimii fisurii în raport cu numărul ciclurilor de solicitare. Ambele se bazează pe încercarea la tracţiune a probei compacte din OLC45, tratat termic prin călire. Prima metodă utilizează softul specializat pentru determinarea vitezei de propagare a fisurii, care este instalat pe PC-ul ce controlează maşina de încercat. La rândul lui, acest soft colectează date atât de la maşina de încercat, cât şi de la extensometrul de tip „clip-on-gage” ataşat probei compacte. A doua metodă utilizează date preluate de la un senzor rezistiv special, de tip Vishay (Tk-09-CPB02-005/DP), destinat să determine propagarea fisurii şi lipit în imediata vecinătate a fisurii induse iniţial prin oboseală. Pe baza datelor obţinute se face o comparaţie între cele două metode de determinare, ultima având avantajul că poate fi aplicată chiar la locul de funcţionare a piesei pentru care se stabileşte viteza de propagare a fisurii.



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