A Method for Calibrating a Digital Image Correlation System for Full-Field Strain Measurements during Large Deformations

Blenkinsopp, Robert; Roberts, Jonathan R.; Harland, Andy R.; Sherratt, Paul J.; Smith, Paul K.; Lucas, Tim

doi:10.3390/app9142828

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…The strains, obtained from the 3D DIC system, are the average of Green-Lagrange strains concerning the relationship between the reference undeformed tensile sample and the deformed sample after loading. [54] In scientific studies dealing with the DIC technique, the strain after plastic deformation commonly is given as logarithmic strain. Therefore, the average of Green-Lagrange strains are converted into the logarithmic strain defined by the following definition along the sample cross section [55]…”

Section: Microscopic Deformation Behavior Using the Tapered Sample Geometrymentioning

confidence: 99%

Characterization of Mechanical Properties, Macroscopic Deformation Behavior, and Microstructure of Functionally Graded 22MnB5 Steel

Scharifi

Schade

Ademaj³

et al. 2021

steel research int.

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The ongoing global trend toward carbon dioxide emission reduction forced the automotive industry to design lighter and resource-efficient vehicle bodies, leading to the huge success of the press hardening process. [1][2][3][4][5] One reason for this success lies in the availability of thin-walled ultrahigh strength steel 22MnB5, which combines good formability and highest strength properties of 1500 MPa at a fully martensitic structure after press hardening at reasonable costs. [6,7] Since the first application in the automotive industry in 1986 as a side-impact beam, [8] the application field of 22MnB5 components increases continuously from B-pillar to roof rail reinforcement and other parts to enhance passenger safety. [9,10] The thermomechanical approach of press hardening allows the production of complex-shaped components with high dimensional accuracy, [11] excellent mechanical properties, and, at the same time, offers the opportunity for realizing tailored properties. [12,13] Although a time-temperature course of uniform austenitization and quenching in a cooled forming tool, Figure 1a, results in a homogenous fully martensitic structure with highest strength, a locally varying time-temperature course during the forming process, Figure 1b, enables the creation of a tailored distribution of microstructures, where mechanical properties are locally adjusted to perfectly meet the load profile, e.g., in case of crash-relevant components. [5,6] According to Ademaj et al., after uniform austenitization at 930 C but differential cooling of 22MnB5, zones following "route H" develop highest tensile strengths (1500 MPa) whereas zones following "route S" show lower tensile strength properties (614 MPa). [14] Both process strategies of Figure 1 are chosen for the current study with respect to the aforementioned investigations.This approach has been identified as a viable option to obtain lighter body structures through the ability to design load adapted structures and to combine contradictory requirements within one component. [14,15] A prominent example in car body structures is the B-pillar, in which the bottom section exhibits higher

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Section: Microscopic Deformation Behavior Using the Tapered Sample Geometrymentioning

confidence: 99%

Characterization of Mechanical Properties, Macroscopic Deformation Behavior, and Microstructure of Functionally Graded 22MnB5 Steel

Scharifi

Schade

Ademaj³

et al. 2021

steel research int.

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“…Regarding an atypical application, balloons, the authors of [6] recall that the field of (very) large deformation is still wide open and depending on the use case, special specific experimental configurations may help. It is also a theme addressed by [7] where calibrated targets were used to evaluate measurement uncertainties in this large deformation regime. The possibility to bridge more intimately measurements and models is highlighted in [8] where experimental measurements are combined to a model to extract mechanical fields with a certain mechanical admissibility close to a shear crack at bi-material interface.…”

Section: Advances In Dicmentioning

confidence: 99%

Special Issue on Advances in Digital Image Correlation (DIC)

Périé

Passieux

2020

Applied Sciences

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“…The CC criterion uses the maximum value of the highest correlation from the calculation. In contrast, the SSD criterion uses the minimum value of the highest correlation [20][21][22]. Table 1 shows commonly used cross-correlation criteria and their definitions, and Table 2 shows those for the sum of squared differences criteria.…”

Section: Digital Image Correlation (Dic) Systemmentioning

confidence: 99%

A Study on Tensile Strain Distribution and Fracture Coordinate of Nanofiber Mat by Digital Image Correlation System

2020

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Strain gauges are commonly used for tension tests to obtain the strain of a metal test specimen. They make contact, however, so the gauges are not applicable to every type of test specimen. That is the reason why a non-contact type measurement system is required. Nanofibrous mats, manufactured by electrospinning, have different structures and thicknesses. Displacement and strain distributions for all ranges of the specimen have never been demonstrated for nanofiber mats so far. Wrinkled nanofibrous mats of polyurethane were made and then tension-tested. The Digital Image Correlation (DIC) method was employed to measure displacement, then to calculate strain for all areas of the specimen. The DIC system consisted of a CMOS camera, control PC and operating software with a DIC algorithm: then, the Center of Gravity (COG) algorithm was used for this system. A cross-head speed of 3 mm/min was set for the tension test. The image record speed was one frame a second. In total, 400 image frames were obtained from the start, and then displacement and strain distributions were acquired for a 400 second tension test. The strain distribution from DIC system showed good agreement with the test result by a universal testing machine.

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A Method for Calibrating a Digital Image Correlation System for Full-Field Strain Measurements during Large Deformations

Cited by 16 publications

References 23 publications

Characterization of Mechanical Properties, Macroscopic Deformation Behavior, and Microstructure of Functionally Graded 22MnB5 Steel

Characterization of Mechanical Properties, Macroscopic Deformation Behavior, and Microstructure of Functionally Graded 22MnB5 Steel

Special Issue on Advances in Digital Image Correlation (DIC)

A Study on Tensile Strain Distribution and Fracture Coordinate of Nanofiber Mat by Digital Image Correlation System

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