Mechanical behavior and fracture characteristics of polymeric pipes under curved three point bending tests: Experimental and numerical approaches

Jemii, Houcine; Bahri, Amir; Taktak, Rym; Guermazi, Noamen; Lebon, Frédéric

doi:10.1016/j.engfailanal.2022.106352

Cited by 5 publications

(1 citation statement)

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“…The design of a bending fatigue specimen needs to consider factors that include the intrinsic frequency of the specimen, the vibration mode, and the stress distribution of the specimen [4,28]. In order to ensure that the ultrasonic fatigue test system can resonate at 20 kHz, it is desirable to ensure that the intrinsic frequency of each component of the test system (including amplifiers, extension bars, and bending specimens) is maintained near 20 kHz.…”

Section: Specimen Design For Very High Cycle Bending Fatiguementioning

confidence: 99%

A Novel Ultrasonic Fatigue Test and Application in Bending Fatigue of TC4 Titanium Alloy

et al. 2022

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The very high cycle fatigue (VHCF) problems of thin-plate structures are usually caused by high-frequency vibrations. This paper proposes an accelerated fatigue test method based on ultrasonic loading technology in order to develop a feasible bending testing method and explore the bending fatigue characteristics of thin-plate structures in the VHCF regime. A new bending fatigue specimen with an intrinsic frequency of 20 kHz was designed based on cantilever bending through finite element simulation. It was verified by the axial load test with R = −1. The results showed that the method could effectively transfer the dangerous cross-section at the first-order cantilever bending restraint to the internal part of the specimen, thereby making the fracture location independent of the complex stresses. The linear relationship between the vibration amplitude and the maximum stress was also verified using strain measurements. Furthermore, the S-N curves and fracture morphology for different loading types were consistent with conventional studies to a certain extent, which indicated that the design of the bending test model was reasonable.

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Section: Specimen Design For Very High Cycle Bending Fatiguementioning

confidence: 99%