Biaxial Fatigue of Metals by Jaap Schijve

Author:Jaap Schijve
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Two different types of tubular specimens shown in Fig. 15 were adopted by Fatemi et al. [15]. The upper specimens was machined from solid material whereas the lower specimen was cut from extruded tube material. Crack growth was studied under different biaxial load sequences.

Fig. 15Two different tubular aluminium alloy specimen adopted by Fatemi et al. [15]. a Machined tubular specimen. b Tubular specimen cut from an existing profile. Dimensions in figures are presented in mm

Gough and Pollard suggested already in 1935 that a hollow specimen could also be loaded by applying an internal pressure in the specimen. This is rarely done, probably because it needs a high internal pressure to obtain a sufficiently large circular hoop stress. However this type of biaxial loading was adopted by Dietmann et al. [16]. The specimen is shown in Fig. 16. It has a relatively large diameter of the circular section. The specimen was loaded by a longitudinal stress and a circumferential stress, which were also applied in phase and out-of-phase, and with different wave shape including phase angle shifts. The paper does not mention the medium to apply the internal pressure but it is expected to be oil. Test results are expressed in numbers of applied cycles until failure in S-N plots. The fatigue failure is not described, but it may be expected that the fatigue life is the number of cycles until leakage occurred. A significant effect of the wave shape and the phase angles was observed.

Fig. 16Tubular specimen used by Dietmann et al. [16]. Relatively large diameter to obtain a significant hoop stress. Dimensions in figures are presented in mm

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