High temperature digital image correlation evaluation of in-situ failure mechanism: An experimental framework with application to C/SiC composites

Mao, Weiguo; Chen, J.; Si, M.; Zhang, R.F.; Ma, Qingsong; Fang, Daining; Chen, X.

doi:10.1016/j.msea.2016.04.021

Cited by 25 publications

(5 citation statements)

References 34 publications

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“…For example, DIC-based methods can reach a precision of 0.01-0.02 pixels in applications [10,11] and interferometry-based methods can get a precision close to the wavelength of the applied laser [12] or the period of the grating [13]. Owing to their noncontact, high-precision, and full-field measurements, optical metrologies can be adopted to characterize many complex mechanical behaviors, such as high temperature [14,15], fracture [16,17], contact [18,19], and vibration [20,21]. During the characterization of these behaviors, the strain field receives particular attention as it determines the deformation state and is closely related to the failure of the structures.…”

Section: Introductionmentioning

confidence: 99%

Outlier removal method for the refinement of optically measured displacement field based on critical factor least squares and subdomain division

Wang¹,

Sun²,

Zhang³

et al. 2022

Meas. Sci. Technol.

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As a representative type of outlier, the abnormal data in displacement measurement often inevitably occurred in full-field optical metrology and significantly affected the further evaluation, especially when calculating the strain field by differencing the displacement. In this study, an outlier removal method is proposed which can recognize and remove the abnormal data in optically measured displacement field. A iterative critical factor least squares algorithm (CFLS) is developed which distinguishes the distance between the data points and the least square plane to identify the outliers. A successive boundary point algorithm is proposed to divide the measurement domain to improve the applicability and effectiveness of the CFLS algorithm. The feasibility and precision of the proposed method are discussed in detail through simulations and experiments. Results show that the outliers are reliably recognized and the precision of the strain estimation is highly improved by using these methods.

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Section: Introductionmentioning

confidence: 99%

Outlier removal method for the refinement of optically measured displacement field based on critical factor least squares and subdomain division

Wang¹,

Sun²,

Zhang³

et al. 2022

Meas. Sci. Technol.

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“…Digital Image Correlation (DIC) is rather easy to implement in contrast to other available methods such as laser speckle interferometry. It has been proven reliable at very high temperatures Leplay et al [2012], Mao et al [2016]. In addition, it has been successfully applied to the characterisation of plastic activity inside grains of polycrystalline materials Gioacchino and da Fonseca [2015], Guery et al [2016].…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic Strain Fields Measurement During the Allotropic α − γ Transformation in High Purity Iron

et al. 2019

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The allotropic phase change from ferrite to austenite represents a moment of massive interplay between the microstructural and mechanical states of iron. The difference of compacity between the two phases induces a microplastic accommodation in the material at grain scale. However, mechanical heterogeneities resulting from the transformation process remain challenging to characterise due to the high temperature conditions it is associated with. We developed experimental equipment for in situ observation of α − γ and γ − α transformations. Images of the surface of an iron sample taken by an optical camera were used as input for a Digital Image Correlation (DIC) routine. Special care was taken to maximize image resolution to capture subgrain phenomena. Observations show that, at the mesoscopic scale, shear strain fields exhibit strong localisations that are evidence of transformations that are occurring.

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“…Over the past few decades, silicon carbide (SiC) ceramics have been extensively used in the structures of modern aviation vehicles, such as rocket nozzles, aeronautic jet engines, and aircraft brake materials, because such ceramics exhibit remarkable physical properties, including wear, corrosion, and thermal resistance [1,2,3,4,5]. In particular, SiC ceramics hold considerable promise for use as solar energy absorbers.…”

Section: Introductionmentioning

confidence: 99%

“…Reaction processing of SiC is a technique for producing advanced SiC-based structural ceramics. This technique involves a chemical reaction between carbon (C) and silicon (Si) during sintering [5]. In recent years, the use of wood as a carbon template for preparing SiC ceramics with a wood-like microstructure (wood-like SiC ceramics) has emerged as a relatively new research area [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Biomorphic Porous SiC Ceramics from Bamboo by Combining Sol–Gel Impregnation and Carbothermal Reduction

Hung

Wu²,

et al. 2019

Polymers

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This study investigated the feasibility of using bamboo to prepare biomorphic porous silicon carbide (bio-SiC) ceramics through a combination of sol–gel impregnation and carbothermal reduction. The effects of sintering temperature, sintering duration, and sol–gel impregnation cycles on the crystalline phases and microstructure of bio-SiC were investigated. X-ray diffraction patterns revealed that when bamboo charcoal–SiO2 composites (BcSiCs) were sintered at 1700 °C for more than 2 h, the resulting bio-SiC ceramics exhibited significant β-SiC diffraction peaks. In addition, when the composites were sintered at 1700 °C for 2 h, scanning electron microscopy micrographs of the resulting bio-SiC ceramic prepared using a single impregnation cycle showed the presence of SiC crystalline particles and nanowires in the cell wall and cell lumen of the carbon template, respectively. However, bio-SiC prepared using three and five repeated cycles of sol–gel impregnation exhibited a foam-like microstructure compared with that prepared using a single impregnation cycle. Moreover, high-resolution transmission electron microscopy and selected area electron diffraction revealed that the atomic plane of the nanowire of bio-SiC prepared from BcSiCs had a planar distance of 0.25 nm and was perpendicular to the (111) growth direction. Similar results were observed for the bio-SiC ceramics prepared from bamboo–SiO2 composites (BSiCs). Accordingly, bio-SiC ceramics can be directly and successfully prepared from BSiCs, simplifying the manufacturing process of SiC ceramics.

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High temperature digital image correlation evaluation of in-situ failure mechanism: An experimental framework with application to C/SiC composites

Cited by 25 publications

References 34 publications

Outlier removal method for the refinement of optically measured displacement field based on critical factor least squares and subdomain division

Outlier removal method for the refinement of optically measured displacement field based on critical factor least squares and subdomain division

Mesoscopic Strain Fields Measurement During the Allotropic α − γ Transformation in High Purity Iron

Preparation of Biomorphic Porous SiC Ceramics from Bamboo by Combining Sol–Gel Impregnation and Carbothermal Reduction

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