Studies on deformation measurement with non-fixed camera using digital image correlation method

Liang, Zhang; Zhang, Jinxiu; Long-hui, Qiu; Lin, Guangyi; Yin, Fengxiang

doi:10.1016/j.measurement.2020.108139

Cited by 13 publications

(7 citation statements)

References 18 publications

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“…There are different representations for calculating the correlation of subsets. The most commonly used is zero normalized cross‐correlation ( C ZNCC ), which is insensitive to light variation 53–56 …”

Section: Methodsmentioning

confidence: 99%

“…The most commonly used is zero normalized cross-correlation (C ZNCC ), which is insensitive to light variation. [53][54][55][56] As depicted in Figure 5, the subset size of the reference image is set to m Â n pixels, and the midpoint of the image subset is P(x,y). The point P(x,y) then moves to point P 0 (x 0 ,y 0 ) after deformation, where U and V denote the displacement of point P in the X-and Y-directions, respectively.…”

Section: Theoretical Principlesmentioning

confidence: 99%

See 1 more Smart Citation

Deformation and fracture behavior of strong–weak coupling structure and its application in coal roadway instability prevention

Zheng

Zhai

Jian-guo

et al. 2021

Fatigue Fract Eng Mat Struct

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The theoretical work, experiments, and practical application in the field are carried out to investigate the performance of strong–weak coupling structure. Results indicate that the deformation in the weak zone is greater than that in the strong zone before the peak stress. Moreover, the weak zone is crushed while the strong zone remains intact after the peak stress. Hence, the coupling structure could protect the strong zone from damage. Furthermore, the strong–weak coupling structure can effectively transfer the peak stress to the further area from coal roadway and improve the ability of the coal roadway surrounding rock to resist deformation. Finally, in the field tests, the strong–weak structure can significantly improve the stability of coal roadway. It shows that the average subsidence of the roadway roof and the accumulated deformation on the sides of the coal roadway in the strong–weak coupling zone were 55.21% and 61.42% lesser than those in the weak zone, respectively.

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Section: Methodsmentioning

confidence: 99%

Section: Theoretical Principlesmentioning

confidence: 99%

Deformation and fracture behavior of strong–weak coupling structure and its application in coal roadway instability prevention

Zheng

Zhai

Jian-guo

et al. 2021

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…The test is carried out in a vacuum environment with extremely high accuracy requirements. The method of image correlation can complete the deformation measurement of the measured object when certain restrictions are met [8], but it cannot complete the high-precision deformation measurement of the large size three-dimensional OMT without comparison standards. Industrial photogrammetry is still the only feasible measurement method at present.…”

Section: Introductionmentioning

confidence: 99%

Industrial photogrammetry for the optical mechanical truss of the China Survey Space Telescope

Shen¹,

Yue²,

Liu³

et al. 2023

Meas. Sci. Technol.

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The China Survey Space Telescope is the main observation stage of the Chinese space station, and is the most advanced and expensive observation equipment ever constructed in the Chinese astronomical community. The telescope is composed of multi-stage mirrors, whose relative positions determine the observation accuracy of the telescope, and an optical mechanical truss forms the mechanical structure that supports them. This paper presents a deformation measurement scheme for the optical mechanical truss, and introduces a process of deformation measurement and a data processing method for this optical mechanical truss using industrial photogrammetry technology. The repeatability and accuracy of the industrial photogrammetry system were tested under ambient conditions, and the length measurement data were compared and verified with interferometry measurements.

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“…Cao et al [44] conducted a digital speckle study on brittle jointed rock specimens under uniaxial compression. Liang et al [45] studied the DIC method for aluminum alloy deformation. Zhou et al [46] studied the DIC technology of uniaxial loading for ductile rock materials with defects.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Deformation and Failure Characteristics of Anchor under Graded Loading and Corrosion

Sun

Wang

et al. 2021

Advances in Materials Science and Engineering

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During the entire life cycle of rock and soil anchors, owing to the influence of adverse factors such as the working environment, load change, and anchor performance degradation, the working load of the anchor will continue to increase and the mechanical properties will continue to deteriorate, which significantly affects the safety and stability of rock and soil anchors. Therefore, this study focuses on the deformation and failure characteristics of anchors under loading and corrosion conditions by means of indoor simulation tests under laboratory conditions. The results indicate the following. (1) There are obvious cracks on the surfaces of specimens 2# and 10#. In the two groups of specimens, the corroded bolt surface exhibited a corrosion phenomenon. This indicates that the corrosion environment conditions cause a certain degree of damage to the anchored rock mass. (2) Under the same gradient load condition, three observable cracks were found in the 10# anchorage specimens and one observable crack was found in the 2# anchorage specimens. Therefore, it is clear that the damage degree of the anchor increases with an increase in the corrosion time. (3) Under the condition of corrosion environment, the strain in the lower part of the specimen is generally greater than that in the upper part of the specimen, and the failure of this group of specimens in the loading process is mostly splitting failure, which is basically generated along the trend of the strain nephogram, and shear failure occurs with the extension and diffusion of cracks.

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Studies on deformation measurement with non-fixed camera using digital image correlation method

Cited by 13 publications

References 18 publications

Deformation and fracture behavior of strong–weak coupling structure and its application in coal roadway instability prevention

Deformation and fracture behavior of strong–weak coupling structure and its application in coal roadway instability prevention

Industrial photogrammetry for the optical mechanical truss of the China Survey Space Telescope

Experimental Study on the Deformation and Failure Characteristics of Anchor under Graded Loading and Corrosion

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