Abstract
The paper presents the results of tests on the fatigue crack growth for a constant moment amplitude under combined bending with torsion in the aluminium alloy AW-2017A-T4. The tests were performed under different values of the load ratio R. Plane specimens with stress concentrators in form of the external one-sided sharp notch were tested. A non-uniform fatigue cracks growth on both lateral surfaces of specimens was observed during experimental tests. Fatigue cracks were developing in the specimens in two stages; quarter-elliptic edge cracks were observed at the beginning, then evolving into through cracks.
Highlights
Fatigue of materials, especially formation of fatigue cracks and their growth belong to the most important problems of solid mechanics, and they have been intensely investigated for many years [1, 2]
The paper presents the results of tests on the fatigue crack growth for a constant moment amplitude under combined bending with torsion in the aluminium alloy AW-2017A-T4
Descriptions of fatigue crack growth under bending with torsion of elements with rectangular cross sections are rarely discussed in the literature
Summary
Especially formation of fatigue cracks and their growth belong to the most important problems of solid mechanics, and they have been intensely investigated for many years [1, 2]. These phenomena are extremely important, because they damage components of machines, and in many cases they cause disasters. Descriptions of fatigue crack growth under bending with torsion of elements with rectangular cross sections are rarely discussed in the literature. Reason behind this is that such elements are less widely used in the industry. The aim of the paper is to describe fatigue cracks growth in specimens with rectangular cross-section made of the AW2017A-T4 aluminium alloy under bending with torsion
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