Buckling identification in composite cylindrical shells with measured imperfections using a Multi-DIC method and finite element analysis

Xin, Ruihai; Le, Vinh Tung; Goo, Nam Seo

doi:10.1016/j.tws.2022.109436

Cited by 17 publications

(8 citation statements)

References 28 publications

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“…Typically, a speckle pattern is devised using black and white paint, one serving as the background and the other as randomly distributed dots. The size of the random dots in the speckle pattern is a critical requirement, and according to Equation ( 2), the dimension of the random dots should be 3~5 times the spatial resolution [26], where s is the dot size, V is the measuring volume, and r is the camera resolution. These parameters can be defined by calibration parameters.…”

Section: Theorymentioning

confidence: 99%

High-Temperature DIC Deformation Measurement under High-Intensity Blackbody Radiation

Han,

Goo

2024

Aerospace

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During the high-speed flight of a vehicle in the atmosphere, surface friction with the air generates aerodynamic heating. The aerodynamic heating phenomenon can create extremely high temperatures near the surface. These high temperatures impact material properties and the structure of the aircraft, so thermal deformation measurement is essential in aerospace engineering. This paper revisits high-temperature deformation measurement using the digital image correlation (DIC) technique under high-intensity blackbody radiation with a precise speckle pattern fabrication and a heat haze reduction method. The effects of the speckle pattern on the DIC measurement have been thoroughly studied at room temperature, but high-temperature measurement studies have not reported such effects so far. We found that the commonly used methods to reduce the heat haze effect could produce incorrect results. Hence, we propose a new method to mitigate heat haze effects. An infrared radiation heater was employed to make an experimental setup that could heat a specimen up to 950 °C. First, we mitigated image saturation using a short-wavelength bandpass filter with blue light illumination, a standard procedure for high-temperature DIC deformation measurement. Second, we studied how to determine the proper size of the speckle pattern in a high-temperature environment. Third, we devised a reduction method for the heat haze effect. As proof of the effectiveness of our developed experimental method, we successfully measured the deformation of stainless steel 304 specimens from 25 °C to 800 °C. The results confirmed that this method can be applied to the research and development of thermal protection systems in the aerospace field.

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Section: Theorymentioning

confidence: 99%

High-Temperature DIC Deformation Measurement under High-Intensity Blackbody Radiation

Han,

Goo

2024

Aerospace

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“…Feng et al 32 analyzed the crack extension of the wrapped composite joints under fatigue by a combination of finite element analysis (FEA) and DIC techniques. Xin et al 33 used FE method and DIC tests to analyze and identify buckling of cylindrical thin‐walled structures with defects. Naresh et al 34 measured the displacement field of fiber‐reinforced polymer structure in situ at different strain rates using the DIC technique.…”

Section: Introductionmentioning

confidence: 99%

Experimental validation study on snap through and coiling up of deployable composite shells

Chang,

Zhao,

et al. 2023

Polymer Composites

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Bistable reeled composite shells (BRCS) have been widely used in deployable space structures due to advanced properties of light weight and large volume reduction. A finite element simulation and experimental validation to study the transition of BRCS between their two stable states are performed. In this article, multiscale representative volume element (RVE) modeling is used to compute the equivalent mechanical properties of carbon/epoxy plain woven fabrics that were utilized to construct the deployable composite laminates, followed by experimental verification. The deformation characteristics and strain energy distribution of the deployable composite shell (DCS) during snap through and coiling up are investigated using finite element analysis (FEA) and verified by strain‐gauge and digital image correlation (DIC) tests. The results show that the strain energy distribution in the snap through and coiling up of the carbon/epoxy plain woven BRCS with laminate stacking sequence of [+45/−45] is approximately symmetric. Additionally, an offset phenomena is observed during the coiling up of the BRCS in the finite element modeling. A parametric analysis is complemented to investigate effects of fiber angles on the deformation characteristics and strain energy distribution of the shell structures during snap through and coiling up.Highlights Shell deformation during snap through and coiling up was investigated. DIC test was performed to capture the shell deformation. Strain energy distribution of the deployable composite shell was discussed. Offset phenomena are observed during the coiling up.

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“…It is difficult to analyze the mechanical behavior of a heterogeneous welding joint using typical analytical methods. The digital image correlation (DIC) technique is an in situ observation method that provides 2D or 3D displacement fields of solid surfaces [7][8][9], thereby aiding in understanding the mechanical behavior of large-scale heterogeneous materials. Bardel et al investigated the in-plane strain distribution of an aluminum alloy 6061-T6 butt-weld joint during a DIC-aided tensile test [10].…”

Section: Introductionmentioning

confidence: 99%

In Situ Observations of the Strain Competition Phenomenon in Aluminum Alloy Resistance Spot Welding Joints during Lap Shear Testing

Zhang,

Tang,

Liu

et al. 2023

Metals

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The real-time evolution of the deformation and strain field of non-heat-treatable aluminum alloy 5754 and heat-treatable aluminum alloy 6061 resistance spot welding joints during the lap shear test was extracted using the digital image correlation (DIC) technique. The strain competition phenomenon between the nugget and its peripheral metal was quantitatively analyzed by applying 2D and 3D DIC analyses. The quantitative data show the tensile strain concentrated in the peripheral metal of the AA5754-O joint, which fractured in the pull-out mode. In comparison, a significant shear strain appears in the nugget of the AA6061-T6 joint, leading to its fracture in the interfacial failure mode during the lap shear test. The phase evolution of the nugget was analyzed using the thermodynamics database JMatPro, which was further used to calculate the local strength of the joints. The results indicate that the nugget strength of AA5754 is 223 MPa, the nugget strength of AA6061 is 178 MPa, and the heat-affected zone (HAZ) strength of AA6061 is 263 MPa. By inputting the local strength data, the calculated result of the analytical load-bearing competition model is in accordance with the experimental data of the lap shear test.

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Buckling identification in composite cylindrical shells with measured imperfections using a Multi-DIC method and finite element analysis

Cited by 17 publications

References 28 publications

High-Temperature DIC Deformation Measurement under High-Intensity Blackbody Radiation

High-Temperature DIC Deformation Measurement under High-Intensity Blackbody Radiation

Experimental validation study on snap through and coiling up of deployable composite shells

In Situ Observations of the Strain Competition Phenomenon in Aluminum Alloy Resistance Spot Welding Joints during Lap Shear Testing

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