Two-dimensional Moiré phase analysis for accurate strain distribution measurement and application in crack prediction

Wang, Qinghua; Ri, Shien; Tsuda, Hiroshi; Koyama, Motomichi; Tsuzaki, Kaneaki

doi:10.1364/oe.25.013465

Cited by 40 publications

(46 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The above equation can be regarded as a simplified expression of the strain measurement equation in [ 30 ] or [ 33 ] by considering that the 2D grid includes two perpendicular gratings and one grating is parallel to the analysis direction.…”

Section: Principle Of Strain Measurementmentioning

confidence: 99%

“…The combination between the sampling Moiré method and the phase differential way capacitates accurate normal strain measurement and has been used for deformation measurement of CFRP [ 16 ]. The two-dimensional (2D) Moiré phase analysis method enables both high-accuracy shear strain and normal strain measurement and has been applied for crack occurrence prediction [ 30 ]. The Fourier transform filtered sampling Moiré method has strong anti-noise ability and has been used for defect detection [ 31 ] and strain evaluation [ 32 ] of atomic structures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interlaminar Shear Behavior of Laminated Carbon Fiber Reinforced Plastic from Microscale Strain Distributions Measured by Sampling Moiré Technique

Wang

Tsuda

et al. 2018

Materials

Self Cite

View full text Add to dashboard Cite

In this article, the interlaminar shear behavior of a [±45°]4s laminated carbon fiber reinforced plastic (CFRP) specimen is investigated, by utilizing microscale strain mapping in a wide field of view. A three-point bending device is developed under a laser scanning microscope, and the full-field strain distributions, including normal, shear and principal strains on the cross section of CFRP, in a three-point bending test, are measured using a developed sampling Moiré technique. The microscale shear strain concentrations at interfaces between each two adjacent layers were successfully detected and found to be positive-negative alternately distributed before damage occurrence. The 45° layers slipped to the right relative to the −45° layers, visualized from the revised Moiré phases, and shear strain distributions of the angle-ply CFRP under different loads. The absolute values of the shear strain at interfaces gradually rose with the increase of the bending load, and the sudden decrease of the shear strain peak value implied the occurrence of interlaminar damage. The evolution of the shear strain concentrations is useful in the quantitative evaluation of the potential interlaminar shear failure.

show abstract

Section: Principle Of Strain Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interlaminar Shear Behavior of Laminated Carbon Fiber Reinforced Plastic from Microscale Strain Distributions Measured by Sampling Moiré Technique

Wang

Tsuda

et al. 2018

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…The above equation can be regarded as a simplified expression of the strain measurement equation in [16] or [19] by considering that the 2D grid includes two perpendicular gratings and one …”

Section: Strain Measurement Using Local Phase Unwrapping Algorithmmentioning

confidence: 99%

“…The combination between the sampling Moiré method and the phase differential way capacitates accurate normal strain measurement and has been used for deformation measurement of CFRP [15]. The twodimensional (2D) Moiré phase analysis method enables both high-accuracy shear strain and normal strain measurement and has been applied for crack occurrence prediction [16]. The Fourier transform filtered sampling Moiré method has strong anti-noise ability and has been used for defect detection [17] and strain evaluation [18] of atomic structures.…”

Section: Introductionmentioning

confidence: 99%

Interlaminar Shear Behavior of Laminated Carbon Fiber Reinforced Plastic from Microscale Strain Distributions Measured by Sampling Moire Technique

Wang¹,

Ri²,

Tsuda³

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract:The interlaminar shear behavior of a [±45°] laminated carbon fiber reinforced plastic (CFRP) specimen was investigated utilizing microscale strain mapping in a wide field of view. A three-point bending device was developed under a laser scanning microscope, and the full-field strain distributions including normal, shear and principal strains of CFRP in a three-point bending test were measured using a developed sampling Moiré technique. The microscale shear strain concentrations at interfaces between each two adjacent layers were successfully detected and found to be positive-negative alternately distributed before damage occurrence. The 45° layers slipped to the right relative to the -45° layers, visualized from the revised Moiré phases and shear strain distributions of the angle-ply CFRP under different loads. The absolute values of the shear strain at interfaces gradually rose with the increase of the bending load, and the sudden decrease of the shear strain peak value implied the occurrence of interlaminar damage. The evolution of the shear strain concentrations is useful in the quantitative evaluation of the potential interlaminar shear failure.

show abstract

“…A scanning moiré method was proposed to generate moiré fringes by sampling a grating pattern using a scanner composed by a set of regularly spaced dots or lines [ 21 ]. However, the sensitivity of the geometric and scanning moiré methods are limited as they only use the information of the moiré fringes’ centerlines [ 22 , 23 ]. To achieve higher sensitivity, a temporal phase shifting method which makes use of the whole intensity profiles of the grating was developed [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

An Optical Crack Growth Sensor Using the Digital Sampling Moiré Method

Chen

Chang

Xiang

et al. 2018

Sensors

View full text Add to dashboard Cite

High-accuracy crack growth measurement is crucial for the health assessment of concrete structures. In this work, an optical crack growth sensor using the digital sampling moiré (DSM) method is developed for two-dimensional (2D) crack growth monitoring. The DSM method generates moiré fringes from a single image through digital image processing, and it measures 2D displacements using the phase difference of moiré fringes between motion. Compared with the previous sensors using traditional photogrammetric algorithms such as the normalized cross-correlation (NCC) method, this new DSM-based sensor has several advantages: First, it is of a higher sensitivity and lower computational cost; second, it requires no prior calibration to get accurate 2D displacements which can greatly simplify the practical application for multiple crack monitoring. In addition, it is more robust to the change of imaging distance, which is determined by the height difference between two sides of a concrete crack. These advantages break the limitation of the NCC method and broaden the applicability of the crack growth sensor. These advantages have been verified with one numerical simulation and two laboratory tests.

show abstract

Two-dimensional Moiré phase analysis for accurate strain distribution measurement and application in crack prediction

Cited by 40 publications

References 26 publications

Interlaminar Shear Behavior of Laminated Carbon Fiber Reinforced Plastic from Microscale Strain Distributions Measured by Sampling Moiré Technique

Interlaminar Shear Behavior of Laminated Carbon Fiber Reinforced Plastic from Microscale Strain Distributions Measured by Sampling Moiré Technique

Interlaminar Shear Behavior of Laminated Carbon Fiber Reinforced Plastic from Microscale Strain Distributions Measured by Sampling Moire Technique

An Optical Crack Growth Sensor Using the Digital Sampling Moiré Method

Contact Info

Product

Resources

About