Evaluating deformation at high temperatures

Zhan-wei, Liu; Xie, Huimin; Wang, Huaixi; Zhang, Hongye; Yang, Xiaobo

doi:10.1117/2.1201412.005649

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…This article is protected by copyright. All rights reserved spraying particles, e.g., Ti (tested at 650-800 ℃) 13 , Au (tested at ~700 ℃) 14 , amorphous silica and TiO 2 8 , and CoO (tested at 1100 ℃) 15,16 , however, usability of these materials is limited below 1200 ℃ 17 . Tungsten coatings deposited by atmospheric plasma spraying (APS)were also used to improve the thermal stability of speckle patterns 18,19 .…”

Section: Accepted Articlementioning

confidence: 99%

“…Recent studies also showed that DIC is an effective tool to understand heterogeneous deformation of fiber‐reinforced CMCs and ceramic coatings at high temperature in various scales 9 ; however, application of DIC at high temperature is limited by heat resistance of the speckle pattern. Various materials were investigated as spraying particles, for example, Ti (tested at 650‐800°C), 13 Au (tested at ~700°C), 14 amorphous silica and TiO 2 , 8 and CoO (tested at 1100°C) 15,16 ; however, usability of these materials is limited below 1200°C 17 . Tungsten coatings deposited by atmospheric plasma spraying (APS) were also used to improve the thermal stability of speckle patterns 18,19 .…”

Section: Introductionmentioning

confidence: 99%

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Optical imaging of surface strain distribution up to 1500°C: Development of micro‐speckle pattern

Arai

Inoue

Kakisawa

2021

Int J Ceramic Engine & Sci

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Micro-speckle patterns were fabricated using α-Al 2 O 3 and SiC micro-particles for in-plane strain distribution measurement at temperatures up to 1500 ℃ using an ultraviolet high temperature observation system (UV-HTOS) combined with a digital image correlation (DIC) technique. The experimental results showed that the measured mean surface strains of α-Al 2 O 3 were in good agreement with the calculated values obtained from thermal expansion coefficient and temperature difference. The proposed speckle pattern could be used for strain distribution measurement without degradation even after heating up to 1500 ℃. The results also demonstrated that the pattern fabricated in this study is effective to understand the heterogeneous deformation mechanism in composite materials applied in high temperature structural components.

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Section: Accepted Articlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical imaging of surface strain distribution up to 1500°C: Development of micro‐speckle pattern

Arai

Inoue

Kakisawa

2021

Int J Ceramic Engine & Sci

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“…Hence, it is suitable for measuring physical properties of a deformable object due to its ability to detect the displacements of points. The moiré interferometry has been employed in many types of materials such as solids, films and composites in measurement of mechanical properties, such as stress and strain, as well as in the study of crack propagation and morphogenesis [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Stress-Strain Measurement of Rubber with Optical Moiré Fringes

Sriklin

Sriwipat²,

Suwanna

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. We use the moiré fringes to measure true stress and true strain of a rubber specimen in tension, and analyze the stress-strain relationship. With the printed straight-line pattern on a specimen, the moiré patterns appear when the specimen is stretched. The geometrical relationship of bright and dark fringes is used to calculate the strain values both in the axial and transverse directions. Together with optical image processing, which can also be used to obtain the instantaneous cross sectional area, we can determine true stress and true strain. The results from the moiré method yield the true stress and true strain in good agreement with those calculated from the standard engineering measurement. Additional benefits of the method include simultaneous measurement of stress and strain, their inhomogeneity, and shear strain.

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“…This change will have a significant impact on the optical system, and even make it a failure for a lofty precision optical machine, which required little change of performance with the temperature. PbTe film is widely used in infrared optical film, especially in the far infrared region due to its interesting properties, such as a high refractive index and wide transparent region [8][9][10][11] . Currently, the refractive index of PbTe film under cryogenic conditions is commonly obtained by the fitting method and extrapolation [12][13][14] .…”

mentioning

confidence: 99%

Temperature coefficient of the refractive index for PbTe film

Zhou

et al. 2017

Chin. Opt. Lett.

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Specimens of PbTe single film are deposited on Ge substrates by vacuum thermal evaporation. During the temperature range of 80-300 K, the transmittance of a PbTe film within 2-15 μm is measured every 20 K by the PerkinElmer Fourier transform infrared spectroscopy cryogenic testing system. Then, the relationship between the refractive index and wavelength within 7-12 μm at different temperatures is received by the full spectrum inversion method fitting. It can be seen that the relationship conforms to the Cauchy formula, which can be fitted. Then, the relationship between the refractive index of the PbTe film and the temperature/wavelength can be expressed as nðλ; T Þ ¼ 5.82840 − 0.00304T þ 4.61458 × 10 −6 T 2 þ 8.00280∕λ 2 þ 0.21544∕λ 4 , which is obtained by the fitting method based on the Cauchy formula. Finally, the designed value obtained by the formula and the measured spectrum are compared to verify the accuracy of the formula.

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Evaluating deformation at high temperatures

Abstract: Two novel deformation carrier fabrication methods, using nanoimprint lithography and micromachine technology, respectively, enable the measurement of mechanical behavior under thermal shock.

Cited by 3 publications

References 5 publications

Optical imaging of surface strain distribution up to 1500°C: Development of micro‐speckle pattern

Optical imaging of surface strain distribution up to 1500°C: Development of micro‐speckle pattern

Stress-Strain Measurement of Rubber with Optical Moiré Fringes

Temperature coefficient of the refractive index for PbTe film

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