Estimation of stress in specimens loaded with ultrasonic fatigue machines

Jacquemain, Vincent; Ranc, Nicolas; Cheuleu, Christophe; Michel, Vincent; Favier, Véronique; Castelnau, Olivier; Vinci, Doriana; Thiaudière, Dominique; Mocuta, Christian

doi:10.1016/j.ijfatigue.2021.106474

Cited by 12 publications

(4 citation statements)

References 33 publications

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“…1. More details on the design methodology are given by Jacquemain et al (2021). It is to be noted that the fatigue limit was measured after 10 9 cycles for this material and was found to lie close to 400 MPa.…”

Section: Ultrasonic Fatigue Machine and Specimenmentioning

confidence: 98%

“…with " el hkl the elastic lattice strain, 2 0 the reference angular position of the diffraction peak without applied loading, Á2 0 the variation of the diffraction peak angular position during the loading and S 110 the X-ray elastic constant for the {110} diffraction planes family. Jacquemain et al (2021) give an estimation of S 110 of about À 1.32 Â 10 À6 MPa À1 for a random crystallographic texture and an equiaxed mean grain shape.…”

Section: Estimation Of the Mechanical Work Supplied To The Materials ...mentioning

confidence: 98%

“…The total strain rate is easily measured using a strain gauge and the stress can be estimated by X-ray diffraction as detailed in Section 2. An experimental device has already been proposed by our research team to make these measurements during ultrasonic fatigue tests (Jacquemain et al, 2021). However, owing to the low damping of metals, the opening of the hysteresis loop in a stress-strain diagram remains very small and thus it is necessary to be able to detect tiny time shifts between stress and strain that are largely smaller compared with the loading period.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the mechanical work during ultrasonic fatigue loading using pulsed time-resolved X-ray diffraction

Jacquemain,

Cheuleu,

Ranc

et al. 2024

J Synchrotron Radiat

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In the energy production and transportation industries, numerous metallic structures may be subjected to at least several billions of cycles, i.e. loaded in the very high cycle fatigue domain (VHCF). Therefore, to design structures in the VHCF domain, a reliable methodology is necessary. One useful quantity to characterize plastic activity at the microscopic scale and fatigue damage evolution is the mechanical work supplied to a material. However, the estimation of this mechanical work in a metal during ultrasonic fatigue tests remains challenging. This paper aims to present an innovative methodology to quantify this. An experimental procedure was developed to estimate the mechanical work from stress and total strain evolution measurements during one loading cycle with a time accuracy of about 50 ns. This was achieved by conducting time-resolved X-ray diffraction coupled to strain gauge measurements at a synchrotron facility working in pulsed mode (single-bunch mode).

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Section: Ultrasonic Fatigue Machine and Specimenmentioning

confidence: 98%

Section: Estimation Of the Mechanical Work Supplied To The Materials ...mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Investigation of the mechanical work during ultrasonic fatigue loading using pulsed time-resolved X-ray diffraction

Jacquemain,

Cheuleu,

Ranc

et al. 2024

J Synchrotron Radiat

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show abstract

“…Several previous studies have demonstrated the feasibility of using neutron or synchrotron X-ray diffraction to observe cyclic mechanical processes. 24,27,50,51 These experiments have used stroboscopic strain measurement at fixed points within a specimen, which requires the process being studied to be steady and reversible over many cycles while stroboscopic information is collected. In the present work, stroboscopy was used within a moving (i.e., Eulerian) frame-of-reference to observe an irreversible cyclic mechanical process.…”

Section: Stroboscopic Measurementmentioning

confidence: 99%

Subsurface fatigue crack tip strains in 7475‐T7351 aluminium alloy measured using stroboscopic neutron diffraction

Coules

Probert

Azuma

et al. 2023

Fatigue Fract Eng Mat Struct

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Fatigue crack growth in thick‐section metals is typically controlled by an internal plane strain region where strong triaxial constraint of the crack tip occurs. However, the crack tip stress state in this region is challenging to measure. We have used neutron diffraction to study the plane strain section of fatigue crack tips in situ. A stroboscopic form of neutron diffraction using a moving frame‐of‐reference was developed to measure crack tip strains as a function of phase in the fatigue loading cycle without interrupting the cyclic load. Using point measurements of near‐tip strain in 7475‐T7351 aluminium alloy in conjunction with finite element analysis, we can estimate the extent of the crack tip plastic zone, verifying that it is small for this material and set of loading conditions.

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Application of ultrasonic fatigue technology in very-high-cycle fatigue testing of aviation gas turbine engine blade materials: A review

Zhao,

Wan,

Zhang

et al. 2024

Sci. China Technol. Sci.

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Estimation of stress in specimens loaded with ultrasonic fatigue machines

Cited by 12 publications

References 33 publications

Investigation of the mechanical work during ultrasonic fatigue loading using pulsed time-resolved X-ray diffraction

Investigation of the mechanical work during ultrasonic fatigue loading using pulsed time-resolved X-ray diffraction

Subsurface fatigue crack tip strains in 7475‐T7351 aluminium alloy measured using stroboscopic neutron diffraction

Application of ultrasonic fatigue technology in very-high-cycle fatigue testing of aviation gas turbine engine blade materials: A review

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