Residual Stress Evaluation of Short-Fiber Reinforced Plastics by X-Ray Diffraction

Tanaka, Keisuke; Koike, Yuuki; Akiniwa, Yoshiaki

doi:10.4028/www.scientific.net/amr.996.951

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…When uniaxial stress applies to the polycrystalline sample, individual grains deform along the force axis by an amount proportional to the elastic constant, and specific to the grain's own crystal orientation. This phenomenon has been well established in discussions of the elastic properties obtained using diffraction data [20]. A typical example appears in the REBCO coated conductors [6], in which the microtwins are distributed in the grains.…”

Section: Slope Of a Locmentioning

confidence: 61%

Uniaxial strain dependence of the critical current of DI-BSCCO tapes

Osamura¹,

Machiya

Hampshire

et al. 2014

Supercond. Sci. Technol.

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In order to explain the effect of uniaxial strain on the critical current of DI-BSCCO-Bi2223 tapes, we employed a springboard sample holder that can smoothly and continuously apply both tensile and compressive strains to tape samples. Over a narrow tensile strain region, the critical current in the tapes decreased linearly with increasing strain and returned reversibly with decreasing strain. When compressive strain was applied, the critical current first increased and then reached a weak maximum. Thereafter, it decreased monotonically with further increases in compressive strain. At room temperature, the local strain exerted on BSCCO filaments was measured by means of a quantum beam diffraction technique. Over the whole tensile strain region up to 0.2% and the small compressive strain range, the local strain changed linearly with applied strain. When the compressive strain was applied beyond the relaxation strain, the local strain (measured by diffraction) versus the applied strain (measured using a strain gauge) deviated from linearity, which is characteristic of strain relaxation and the onset of BSCCO filament fracture. Thus, the strain at the maximum critical current corresponds to a crossover point in strain, above which the critical current decreased linearly and reversibly with increasing applied strain, and below which the critical current decreased due to the BSCCO filament fracture. In this paper, we clearly characterize the reversible range terminated by both compressive and tensile strains, in which filaments do not fracture. Our analysis of the compressive regime beyond the relaxation strain suggests that although BSCCO filament fracture is the primary factor that leads to a decrease in critical current, the critical current in those regions of filaments that are not fractured increases linearly and reversibly with decreasing applied strain at compressive strains well beyond the reversible region for the tape. List of symbolsA a Applied strain A acr Compressive relaxation strain A aff Force free strain A atr Tensile relaxation strain A i Intrinsic strain (A i = Aa − Ap)

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Section: Slope Of a Locmentioning

confidence: 61%

Uniaxial strain dependence of the critical current of DI-BSCCO tapes

Osamura¹,

Machiya

Hampshire

et al. 2014

Supercond. Sci. Technol.

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“…1. To perform triaxial stress analysis 18) , XRD measurements were conducted at   0°, 45°, and 90°, and…”

Section: Residual Stress Evaluationmentioning

confidence: 99%

“…Therefore, in this study, to solve these problems, we focused on triaxial stress analysis [17][18][19] using the Dölle-Hauk method 16) , which is used to measure the residual stress on lathe-machined surfaces.…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress on Hydrogen Embrittlement at Sheared Edge

et al. 2024

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The residual stresses at a circular punched end face in tempered martensitic high-strength steel sheets were investigated using triaxial stress analysis via X-ray diffraction. The maximum principal stress and its direction were calculated from the measured nine stress components. The relationship between the directions of the maximum principal stress and hydrogen cracks was verified by generating hydrogen cracks on the punched end face in the same specimen using cathodic hydrogen charging. The direction of the cracks was perpendicular to that of the maximum principal stress. This result indicates that hydrogen embrittlement at the sheared end face is caused by the maximum principal stress. Moreover, the distribution of the residual stresses toward the thickness direction and the relationship between residual stresses and tensile strength of the specimens were investigated. The maximum principal stress on the punch side was lower than that on the dice side.Unlike the maximum principal stresses, the normal stresses did not increase monotonically with the tensile strength of the specimens. Therefore, it was concluded that investigating the maximum principal stress at any area between the dice side and a line located midway from the end face and dice side is crucial for considering the hydrogen embrittlement criteria.

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“…The first two methods have been widely employed in the field of bridge detection due to their well-established theoretical foundation and convenient operational procedures [30][31][32][33]. The X-ray diffraction method was first proposed in 1987 [34] and is widely recognized as one of the most powerful nondestructive tools for measuring residual stresses in polycrystalline materials, and it has been extensively employed both in service and laboratory research, where it yields satisfactory predicted results [35,36]. In this paper, the X-ray diffraction method was first used in the prestress testing field, and the X-ray testing machine was self-developed as well.…”

Section: Prestressingmentioning

confidence: 99%

Long-Term Deflection Analysis of Large-Span Continuous Prestressed Concrete Rigid-Frame Bridges Based on a Refined Modeling Approach

Han,

Li,

2023

Applied Sciences

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Numerical modeling approaches are favored for performing long-term analyses of continuous prestressed concrete rigid-frame (CPCR) bridges due to the complexity and high cost of experimental testing on such structures. In this study, a refined numerical modeling approach is first presented and validated by comparing the field monitor data of an existing long-span CPCR bridge in China. Then, long-term deflection analysis—considering box girder cracks, concrete creep, joint damage behavior and prestress—is conducted based on the proposed refined modeling approach. It is found that the time-dependent loss of longitudinal prestress has the most significant influence on the long-term structural stiffness, while joint damage between different segments has limited impact on overall structural performance, especially for large-span bridge cases. The local stress distribution is significantly influenced by typical damage, albeit with a different scope of impact. Therefore, targeted reinforcement has to be performed to achieve satisfactory repair results under different damage conditions.

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Residual Stress Evaluation of Short-Fiber Reinforced Plastics by X-Ray Diffraction

Cited by 5 publications

References 10 publications

Uniaxial strain dependence of the critical current of DI-BSCCO tapes

Uniaxial strain dependence of the critical current of DI-BSCCO tapes

Effect of Residual Stress on Hydrogen Embrittlement at Sheared Edge

Long-Term Deflection Analysis of Large-Span Continuous Prestressed Concrete Rigid-Frame Bridges Based on a Refined Modeling Approach

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