Determination of Local Strain Distribution at the Level of the Constituents of Particle Reinforced Composite: An Experimental and Numerical Study

Ogierman, Witold; Kokot, Grzegorz

doi:10.3390/ma13173889

Cited by 7 publications

(4 citation statements)

References 53 publications

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“…The reference strain/displacement maps and corresponding outputs (information about state/load of the structure) can be numerically simulated. Ogierman and Kokot [12] proved that data obtained from DIC and numerical simulations can be uniformed to the same format of maps and compared quantitatively. The structural response to different loads is described by a boundary value problem therefore, finite element-based [13] commercial software can be utilized to perform a series of analyses on a parametric numerical model.…”

Section: Image Classification Networkmentioning

confidence: 99%

New Operational Load Monitoring Approach Using Digital Image Correlation and Image Classification Networks

Mucha

Kokot

Viana

et al. 2023

J. Phys.: Conf. Ser.

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The following paper presents a novel approach that can be applied to Operational Load Monitoring and Structural Health Monitoring processes. The approach is based on artificial intelligence (AI) and digital image correlation (DIC) techniques. DIC is an optical method that allows measuring full-field structural displacements and strains. In the presented approach only a relatively small fragment of the material’s surface is monitored by DIC. The obtained partial image of strains or displacements is then processed by a carefully trained AI model, an image classification network, able to predict the state of whole structure (e.g. materials stresses, potential loss of material continuity). The assumption is that all possible load cases and states of the monitored structure can be identified and simulated, so the data obtained from simulations can then be used to train the image classification network. A numerical example is presented as proof of the presented concept. A modern lightweight aerostructure in the form of a hat-stiffened composite panel was used as monitored structure in the presented example and its Operational Load Monitoring was performed based on a relatively small fragment of normal strains map. The reference maps to train the network were simulated numerically. The prediction model estimates the Tsai-Wu failure criterion value for the whole composite material. The obtained accuracy of predictions proved the effectiveness and efficiency of the proposed approach.

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Section: Image Classification Networkmentioning

confidence: 99%

New Operational Load Monitoring Approach Using Digital Image Correlation and Image Classification Networks

Mucha

Kokot

Viana

et al. 2023

J. Phys.: Conf. Ser.

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“…For more references of applications of the FFT approaches in composite materials we point put the following papers: Li et al (2012), Spahn et al (2014), Kabel et al (2014), Willot (2015), Kabel et al (2015), Müller et al (2015), Kabel et al (2016), Vondřejc et al (2015), Ogierman and Kokot (2020).…”

Section: Compositesmentioning

confidence: 99%

FFT based approaches in micromechanics: fundamentals, methods and applications

Lucarini

Upadhyay

Segurado

2021

Modelling Simul. Mater. Sci. Eng.

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FFT methods have become a fundamental tool in computational micromechanics since they were first proposed in 1994 by H. Moulinec and P. Suquet for the homogenization of composites. From that moment on many dierent approaches have been proposed for a more accurate and efficient resolution of the non- linear homogenization problem. Furthermore, the method has been pushed beyond its original purpose and has been adapted to many other problems including continuum and discrete dislocation dynamics, multi-scale modeling or homogenization of coupled problems as fracture or multiphysical problems. In this paper, a comprehensive review of FFT approaches for micromechanical simulations will be made, covering the basic mathematical aspects and a complete description of a selection of approaches which includes the original basic scheme, polarization based methods, Krylov approaches, Fourier-Galerkin and displacement-based methods. The paper will present then the most relevant applications of the method in homogenization of composites, polycrystals or porous materials including the simulation of damage and fracture. It will also include an insight into synergies with experiments or its extension towards dislocation dynamics, multi-physics and multi-scale problems. Finally, the paper will analyze the current limitations of the method and try to analyze the future of the application of FFT approaches in micromechanics.

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“…To achieve the best possible quality of the CT reconstruction suitable for the investigation of the linear microcracks even without synchrotron radiation, it is necessary to use an enhanced methodology of the time-lapse XCT imaging and post-processing protocol. This comprises the in situ fatigue loading of the sample, X-ray source focal spot movement correction, and the post-processing of the dataset using a differential tomography approach coupled with a digital volume correlation (DVC) as a basis for the volume registration procedure [ 17 , 18 , 19 ]. DVC is an extension of the digital image correlation procedure to three dimensions, which can be effectively used for two different purposes.…”

Section: Introductionmentioning

confidence: 99%

A Method for Evaluation the Fatigue Microcrack Propagation in Human Cortical Bone Using Differential X-ray Computed Tomography

et al. 2021

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Fatigue initiation and the propagation of microcracks in a cortical bone is an initial phase of damage development that may ultimately lead to the formation of macroscopic fractures and failure of the bone. In this work, a time-resolved high-resolution X-ray micro-computed tomography (CT) was performed to investigate the system of microcracks in a bone sample loaded by a simulated gait cycle. A low-cycle (1000 cycles) fatigue loading in compression with a 900 N peak amplitude and a 0.4 Hz frequency simulating the slow walk for the initialization of the internal damage of the bone was used. An in-house developed laboratory X-ray micro-CT imaging system coupled with a compact loading device were employed for the in situ uni-axial fatigue experiments reaching a 2m effective voxel size. To reach a comparable quality of the reconstructed 3D images with the SEM microscopy, projection-level corrections and focal spot drift correction were performed prior to the digital volume correlation and evaluation using differential tomography for the identification of the individual microcracks in the microstructure. The microcracks in the intact bone, the crack formation after loading, and the changes in the topology of the microcracks were identified on a volumetric basis in the microstructure of the bone.

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Determination of Local Strain Distribution at the Level of the Constituents of Particle Reinforced Composite: An Experimental and Numerical Study

Cited by 7 publications

References 53 publications

New Operational Load Monitoring Approach Using Digital Image Correlation and Image Classification Networks

New Operational Load Monitoring Approach Using Digital Image Correlation and Image Classification Networks

FFT based approaches in micromechanics: fundamentals, methods and applications

A Method for Evaluation the Fatigue Microcrack Propagation in Human Cortical Bone Using Differential X-ray Computed Tomography

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