Abstract
The work deals with the tests results of the growth of fatigue cracks subjected to torsion and bending with torsion specimens at the constant amplitude loading and with zero or non-zero mean load. In the fatigue tests, specimens made of AW-2017A-T4 alloy with rectangular cross-section weakened by external notches were used. The results of experimental and numerical calculations were presented. During experimental investigations, heterogeneous growth of fatigue cracks at the front and rear of the specimen was noticed. Thereby, both the crack growth rate and the cracking process itself are affected. Two types of fatigue cracking were also observed: surface and passing through specimen. Crack paths were measured on the surface of the specimens using a microscope. Different lifetimes were observed for the specimens subjected only to cyclic torsion compared to those subjected to bending with torsion in the first and second periods of cracking. At the final stage of cracking, both in bending with torsion and in torsion, the difference in crack lengths for ratio a/c and a/a* is greater for R = −1 than for R = 0.
Published Version
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