Abstract
This paper proposes an ultra-high frequency (UHF) fatigue test of a titanium alloy TA11 based on electrodynamic shaker in order to develop a feasible testing method in the VHCF regime. Firstly, a type of UHF fatigue specimen is designed to make its actual testing frequency reach as high as 1756 Hz. Then the influences of the loading frequency and loading types on the testing results are considered separately, and a series of comparative fatigue tests are hence conducted. The results show the testing data from the present UHF fatigue specimen agree well with those from the conventional vibration fatigue specimen with the loading frequency of 240 Hz. Furthermore, the present UHF testing data show good consistency with those from the axial-loading fatigue and rotating bending fatigue tests. But the obtained fatigue life from ultrasonic fatigue test with the loading frequency of 20 kHz is significantly higher than all other fatigue test results. Thus the proposed ultra-high frequency vibration-based fatigue test shows a balance of high efficiency and similarity with the conventional testing results.
Highlights
Aviation equipments, such as aeroplanes and aeroengines always undergo cyclic stress during service time, fatigue damage has been a major concern in the researches of aeronautical materials and structures
In order to compare the results between the two types of fatigue tests, the same stress levels have been considered in the test for conventional vibration vibration fatigue fatigue (CVF) specimens
TA11 based on electrodynamic shaker in order to develop a feasible testing method in the very high cycle fatigue (VHCF)
Summary
Aviation equipments, such as aeroplanes and aeroengines always undergo cyclic stress during service time, fatigue damage has been a major concern in the researches of aeronautical materials and structures. The actual working frequency of these aviation components cannot reach as high as the loading frequency (i.e., 20 kHz) of the ultrasonic fatigue testing For another thing, axial-loading fatigue data does not provide a sufficient representation of HCF or VHCF behaviors of the vibrating components [12]. The specimens are usually excited in a high frequency resonant mode for the purpose of reducing the power-consuming of the testing system [15,16] This can be supported by several vibration fatigue studies of different materials [17,18], most of which have been carried out in the regime of conventional fatigue cycle though. The influences of the loading frequency and loading types on the testing results of the fatigue life are considered separately, and a series of comparative fatigue tests are conducted, with the testing results compared with the present UHF results
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