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Macroscale crease models calibrated to synthetic crease experiments

Tómasson, Kristján LU (2024) In TFHF-5000 FHLM01 20232
Solid Mechanics
Department of Construction Sciences
Abstract
This master's thesis presents a method for approximating the folding behavior of paperboard using macroscopic data. Synthetic data is generated by conducting finite element analysis on paperboard modeled using continuum elements and an advanced constitutive law formulated within a thermodynamic framework. The paperboard model undergoes creasing followed by various folding sequences, enabling the extraction of curves that relate bending resistance to a corresponding fold angle. Additionally, a compression test is conducted, and its results are compared with experimental data found in literature. Subsequently an investigation of capturing the synthetic folding behavior is performed, which involves approximating paperboard with beam elements... (More)
This master's thesis presents a method for approximating the folding behavior of paperboard using macroscopic data. Synthetic data is generated by conducting finite element analysis on paperboard modeled using continuum elements and an advanced constitutive law formulated within a thermodynamic framework. The paperboard model undergoes creasing followed by various folding sequences, enabling the extraction of curves that relate bending resistance to a corresponding fold angle. Additionally, a compression test is conducted, and its results are compared with experimental data found in literature. Subsequently an investigation of capturing the synthetic folding behavior is performed, which involves approximating paperboard with beam elements using a fully linear-elastic material model. A single beam element is used to represent the crease, modified to include plasticity modeling, aiming to replicate behavior seen in synthetic data. A parametric study is conducted by introducing parameters concerning the crease beam's geometric attributes, as well as the linear-elastic and plastic material properties of the crease beam. It is found that the initial sequences of folding are captured relatively well, while for folds of increased complexity the ability of the beam to mimic the macroscopic synthetic data deteriorates. The model's limitations are discussed, particularly regarding the possible need to differentiate the crease beam's behavior under monotonic axial loading from pure bending modes, particularly given the method of plasticity modeling employed. (Less)
Please use this url to cite or link to this publication:
author
Tómasson, Kristján LU
supervisor
organization
course
FHLM01 20232
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
Paperboard creases, Super element, Crease synthetic data
publication/series
TFHF-5000
report number
TFHF-5262
language
English
id
9165103
date added to LUP
2024-06-25 14:51:19
date last changed
2024-06-25 14:51:19
@misc{9165103,
  abstract     = {{This master's thesis presents a method for approximating the folding behavior of paperboard using macroscopic data. Synthetic data is generated by conducting finite element analysis on paperboard modeled using continuum elements and an advanced constitutive law formulated within a thermodynamic framework. The paperboard model undergoes creasing followed by various folding sequences, enabling the extraction of curves that relate bending resistance to a corresponding fold angle. Additionally, a compression test is conducted, and its results are compared with experimental data found in literature. Subsequently an investigation of capturing the synthetic folding behavior is performed, which involves approximating paperboard with beam elements using a fully linear-elastic material model. A single beam element is used to represent the crease, modified to include plasticity modeling, aiming to replicate behavior seen in synthetic data. A parametric study is conducted by introducing parameters concerning the crease beam's geometric attributes, as well as the linear-elastic and plastic material properties of the crease beam. It is found that the initial sequences of folding are captured relatively well, while for folds of increased complexity the ability of the beam to mimic the macroscopic synthetic data deteriorates. The model's limitations are discussed, particularly regarding the possible need to differentiate the crease beam's behavior under monotonic axial loading from pure bending modes, particularly given the method of plasticity modeling employed.}},
  author       = {{Tómasson, Kristján}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{TFHF-5000}},
  title        = {{Macroscale crease models calibrated to synthetic crease experiments}},
  year         = {{2024}},
}