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EN
The study presents a method to determine the σa − N curve (high cycle fatigue) for profiles made of AW-6063 T6 aluminium alloy. Experimental material data for a mini specimen taken directly from the tested item and selected empirical correlations allowing for a size effect have been used. A model yielding the lowest relative error of estimating the fatigue life is presented.
PL
W pracy scharakteryzowano procedurę prowadzenia badań zmęczeniowych w oparciu o normy. Przedstawiono geometrię próbek gładkich, warunki prowadzenia badań i opis wyników w formie charakterystyki zmęczeniowej σa-N. Jako praktyczną możliwość rozszerzenia zakresu identyfikacji własności zmęczeniowych materiału zaproponowano metodykę badań na minipróbkach.
EN
The paper was characterized procedure for conducting fatigue tests based on the standards. The geometry of the smooth specimens, conditions of tests and description of the results (fatigue characteristics σa-N) was presented. As a practical opportunity to extend the scope of the identification of fatigue properties of the material proposed methodology for testing the mini specimens.
PL
W pracy przedstawiono metodykę prowadzenia badań do wyznaczania własności zmęczeniowych materiału z wykorzystaniem minipróbek. Sformułowano hipotezy badawcze i metodykę badań. Wyniki analizowano w zakresie wpływu efektu skali.
EN
This paper presents the research methodology for determining the fatigue properties of the material with the use of mini specimens. The hypotheses and research methodology were formulated. The results of size effect were analyzed.
EN
The study presents several cases where use of specimens with reduced overall dimensions, i.e. mini specimens in the course of fatigue tests is advantageous. The high-cycle fatigue tests based on a developed method have been performed on mini specimens and normative specimens (comparative tests). The tests have been conducted on EN AW-6063 aluminum alloy specimens. A correction coefficient determined as a result of monotonic tests and selected models of the size effect have been critically assessed based on the test results. A statistical Weibull’s weakest link model and a monofractal approach based on a fractal dimension have been verified.
PL
Weryfikacja własności cyklicznych materiału w wielu przypadkach jest to niemożliwa z uwagi na ograniczenia wymiarowe badanych obiektów. Wówczas jednym z rozwiązań jest prowadzenie badań wykorzystujących próbkę mniejszą. W pracy przedstawiono badania porównawcze próbek normatywnych i minipróbek. Nieznacznie większy rozrzut wyników dla minipróbki w stosunku do próbki normatywnej sugeruje wiarygodność proponowanej metodyki.
EN
Verification of material cyclic properties is not possible in many cases due to size limitations of tested objects. One possible solution is to conduct tests which would consider the smaller specimens. This paper presents a comparative study of normative and mini-specimens. Slightly higher spread of results obtained for mini-specimens compared to normative specimens suggests reliability of proposed methodology.
EN
The paper concerns the size effect on fatigue life and fatigue strength. As for the mini specimens, smaller than the normative specimens, they show an increase in fatigue life with a decrease in the object cross-section area. Theoretically the calculational models assume a lack of sensitivity of the aluminum alloys to changes in the crosssection size, which is contrary to the experimental tests. The paper has been an attempt at determining the size effect for EN AW-6063 aluminum alloy mini specimens. Monotonic and fatigue tests were made. There were observed correlations of the results for the coefficient of material sensitivity to change in the cross-section. The results have made it possible to define the relationship of the ultimate tensile strength and fatigue strength for the specimens of various size.
EN
Determining complete material fatigue characteristics (S-N curve) is time-consuming and very expensive. Searching for faster procedures of determining the S-N curve, one can use approximate methods which are burdened with qualitative and quantitative error. Such characteristics differ from the real experimental studies results. Yet another method involves the use of mini specimens; the specimens the dimensions of which are lower than the normative sample. It allows for performing tests using much cheaper test stands. In the specimens researched there is a size effect which is broadly discussed in the available literature. The present work offers a review of the current theoretical knowledge on the size effect. There was analysed the geometry of mini specimens applied in experimental studies. Selected works with the use of mini specimens have been reviewed. Areas have been defined in which the mini specimen application is justifiable.
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