LOW-CYCLE FATIGUE STUDIES ON COMMERCIAL ALUMINIUM IN COMBINED BENDING AND TORSION.
Abstract
A strain-controlled low-cycle combined bending and torsional fatigue testing machine was designed and fabricated. It has two independent 4-bar mechanism with stepless control of both input crank lengths thus giving an independent precise control on the maximum bending deflection and maximum angle of twist.
98.9 per cent pure aluminium specimens of the ASTM hour glass type were tested in pure bending, pure torsion and combined bending and torsional fatigue loading.
The machine performed satisfactorily throughout the range of bending strain and shear strain for which it was designed. The results showed that, in the pure bending and pure torsional fatigue tests, they resembled the test results of previous investigators. The combined bending and torsion low-cycle fatigue results show resemblance to high cycle fatigue results of other investigators quoted. The plot of test results can be used for design of components subject to low-cycle combined bending and torsional fatigue loading.
98.9 per cent pure aluminium specimens of the ASTM hour glass type were tested in pure bending, pure torsion and combined bending and torsional fatigue loading.
The machine performed satisfactorily throughout the range of bending strain and shear strain for which it was designed. The results showed that, in the pure bending and pure torsional fatigue tests, they resembled the test results of previous investigators. The combined bending and torsion low-cycle fatigue results show resemblance to high cycle fatigue results of other investigators quoted. The plot of test results can be used for design of components subject to low-cycle combined bending and torsional fatigue loading.
Keywords
Metal fatigue, low-cycle fatigue, life curves.
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