The Coupled Eulerian-Lagrangian Analysis of the KOBO Extrusion Process

Wójcik, Marta; Skrzat, A.

doi:10.12913/22998624/131663

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…The outcome of this research could serve as the basis for further investigations of the dry ice relaxation phenomenon. The authors plan to use the Maxwell model described in this article and also the Kelvin–Voigt model to develop a material model for use in numerous studies [ 31 , 32 ]. Supplementing the existing lack of knowledge regarding mathematical models describing the phenomena occurring in the dry ice extrusion process, as indicated by Wójcik and Skrzat in 2018 (in the case of material extrusion in the KOBO process), can positively impact the improvement of energy efficiency in industrial processes [ 33 ].…”

Section: Discussionmentioning

confidence: 99%

Influence of Die Land Length on the Maximum Extrusion Force and Dry Ice Pellets Density in Ram Extrusion Process

Górecki,

Łykowski

2023

Materials

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The management of waste materials, particularly non-biodegradable substances such as plastics and composites, is an increasingly pressing issue. Energy efficiency in industrial processes is crucial throughout their life cycle, including the handling of materials such as carbon dioxide (CO2), which has a significant environmental impact. This study focuses on the conversion of solid CO2 into pellets using ram extrusion, a widely used technique. The length of the die land (DL) in this process plays a critical role in determining the maximum extrusion force and the density of dry ice pellets. However, the influence of DL length on the characteristics of dry ice snow, known as compressed carbon dioxide (CCD), remains understudied. To address this research gap, the authors conducted experimental trials using a customized ram extrusion setup, varying the DL length while keeping the other parameters constant. The results demonstrate a substantial correlation between DL length and both the maximum extrusion force and dry ice pellets density. Increasing the DL length leads to a decreased extrusion force and optimized pellet density. These findings provide valuable insights for optimizing the ram extrusion process of dry ice pellets and improving waste management, energy efficiency, and product quality in industries utilizing this technique.

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Section: Discussionmentioning

confidence: 99%

Influence of Die Land Length on the Maximum Extrusion Force and Dry Ice Pellets Density in Ram Extrusion Process

Górecki,

Łykowski

2023

Materials

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“…Due to the superposition of some backstresses, the Chaboche model is also applied for considering the cyclic loading phenomena, e.g. ratcheting, stress relaxation or elastic and plastic shakedown [10][11][12]. The examples of the application of the Chaboche and CIKH models are contained in [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Computational Methods of the Identification of Chaboche Isotropic-Kinematic Hardening Model Parameters Derived from the Cyclic Loading Tests

Wójcik,

Gontarz,

Skrzat

et al. 2024

Adv. Sci. Technol. Res. J.

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The Chaboche-Lemaitre combined isotropic-kinematic hardening model (CKIH) gives an overall information about the material behaviour under cyclic loading. The identification of hardening parameters is a difficult and time-consuming problem. The procedure of the parameters identification using the experimental hysteresis curve obtained in a cyclic loading test under strain control is presented in details here for a S235JR construction steel. The last stabilized cycle extracted from the hysteresis curve is required for the identification of hardening parameters. The model with three backstresses is tested here. The optimization algorithm is also used for the improvement of the agreement between experimental and numerical data. In order to include some uncertainty of experiment and the identification procedure, the authorial algorithm written on the basis of the fuzzy logic soft-computing method is applied here. The results obtained show that the identification procedure presented in this paper ensures the good agreement between the experimental tests and numerical calculations. The correct selection of parameters associated with the hardening is essential for the right description of material behaviour subject to loading in different engineering problems, including in metal forming processes.

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“…Wójcik and Skrzat (2020) applied the Frederick-Armstrong model in order to predict the stress-strain response of a material subject to the cyclic loading test. Authors were also testing the application of both Frederick-Armstrong and Chaboche models in numerical analyses of the KOBO extrusion (Wójcik & Skrzat, 2022b;Wójcik & Skrzat, 2021). Although the good convergence between experimental and numerical results is obtained, only the macroscopic response of the material was considered.…”

Section: Introductionmentioning

confidence: 99%

Crystal Plasticity Elastic-Plastic Rate-Independent Numerical Analyses of Pollycrystalline Materials

Wójcik

Skrzat

Stachowicz

et al. 2023

AMME

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Macroscopic analyses of plastic forming processes give only the overall description of the problem without the consideration of mechanisms of plastic deformation and the microstructure evolution. For the consideration of these processes, numerical simulations within crystal plasticity include the change of texture, anisotropy, and strain hardening of the material are used. In this paper, a crystal plasticity rate-independent model proposed by Anand and Kothari is applied for numerical analyses of polycrystalline materials. The slip was considered as the main mechanism of the plastic deformation. Basic constitutive equations of crystal plasticity for large deformation theories are presented. The selected results of elastic-plastic problems obtained using both macro- and micro- scales software for the explicit and implicit integration are featured here. The heterogeneous distribution of strain and stress in different grains are obtained, which is associated with the various crystal orientation. The crystal plasticity modelling of materials subject to plastic deformation involves not only the information about the change of a material’s shape in a macro-scale, but also describes the phenomena occurring in material in a micro-scale.

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The Coupled Eulerian-Lagrangian Analysis of the KOBO Extrusion Process

Cited by 5 publications

References 28 publications

Influence of Die Land Length on the Maximum Extrusion Force and Dry Ice Pellets Density in Ram Extrusion Process

Influence of Die Land Length on the Maximum Extrusion Force and Dry Ice Pellets Density in Ram Extrusion Process

Computational Methods of the Identification of Chaboche Isotropic-Kinematic Hardening Model Parameters Derived from the Cyclic Loading Tests

Crystal Plasticity Elastic-Plastic Rate-Independent Numerical Analyses of Pollycrystalline Materials

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