Multiscale mechanical modeling of paperboard
(2022) In TFHF-5000 FHLM01 20221Solid Mechanics
Department of Construction Sciences
- Abstract
- This thesis considers an investigation into the possibilities of creating a reasonably accurate multiscale material model for paperboard, with geometry based on X-ray scans of small paperboard samples. The modeling takes place in the software Multiscale Designer by Altair Engineering Inc. A representative volume element (RVE) is used to capture the X-ray geometry and represent macroscopic mechanical properties. The RVE consists of fiber and air phases, perfect fiber-fiber bonding assumed, where the fiber phase is assigned transversely isotropic linear elasticity and isotropic hardening plasticity. This model is considered to behave consistently across different tested X-ray geometries. The results show that it is possible to achieve a... (More)
- This thesis considers an investigation into the possibilities of creating a reasonably accurate multiscale material model for paperboard, with geometry based on X-ray scans of small paperboard samples. The modeling takes place in the software Multiscale Designer by Altair Engineering Inc. A representative volume element (RVE) is used to capture the X-ray geometry and represent macroscopic mechanical properties. The RVE consists of fiber and air phases, perfect fiber-fiber bonding assumed, where the fiber phase is assigned transversely isotropic linear elasticity and isotropic hardening plasticity. This model is considered to behave consistently across different tested X-ray geometries. The results show that it is possible to achieve a reasonably good model fit for in-plane uniaxial tensile tests in MD, CD and 45 degree loading directions.
Further, the model is also exported as a user material in Abaqus, where simulations are performed to compare the multiscale model with a previously established continuum based model. Although the simulation results do not agree completely, there are some similarities, which is promising for further model development.
The multiscale modeling workflow can be automatized to some degree. For this, one needs to ensure the correct content and format of text files used as input in the modeling analyses.
The model may be further developed with additional features such as fiber-fiber bonds, and calibrated towards other and more complex load cases. (Less) - Popular Abstract
- All over the world, on a daily basis, billions of people need food delivered to them safely. This commonly happens with the use of paperboard packages. For obvious reasons, these packages need to stay intact during intended use. With such high stakes, the question is, how can one ensure the durability of paperboard packages?
One solution is to use computer simulations to predict how paperboard behaves when you load it in different ways. You test different variations of paperboard to see which variation is most durable. As you can probably guess, more complex simulations will likely yield more accurate predictions. One way to increase the simulation complexity is to account for the microscopic structure of paperboard. Doing this in the... (More) - All over the world, on a daily basis, billions of people need food delivered to them safely. This commonly happens with the use of paperboard packages. For obvious reasons, these packages need to stay intact during intended use. With such high stakes, the question is, how can one ensure the durability of paperboard packages?
One solution is to use computer simulations to predict how paperboard behaves when you load it in different ways. You test different variations of paperboard to see which variation is most durable. As you can probably guess, more complex simulations will likely yield more accurate predictions. One way to increase the simulation complexity is to account for the microscopic structure of paperboard. Doing this in the past, you would have to wait for weeks or months for the simulation to complete. This is not feasible on an industrial scale. Today though, thanks to clever computation algorithms, one can perform these simulations in minutes. This approach - paperboard microstructure built into the simulation, combined with existing clever computation algorithms - has been tested in this thesis work. Overall, the work has been successful. The simulations performed can predict how paperboard responds when stretched along one axis. Further, a framework has been constructed, upon which future simulations can be based.
This promising work shows the possibilities to more accurately predict paperboard durability, and therefore ensure a safe delivery of food to billions of people all over the world. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9090298
- author
- Boman, Gustav LU
- supervisor
-
- Erik Bergvall LU
- Eric Borgqvist LU
- Matti Ristinmaa LU
- organization
- course
- FHLM01 20221
- year
- 2022
- type
- H3 - Professional qualifications (4 Years - )
- subject
- keywords
- Paperboard, micromechanics, multiscale, fiber, X-ray, RVE
- publication/series
- TFHF-5000
- report number
- TFHF-5249
- language
- English
- id
- 9090298
- date added to LUP
- 2022-06-28 10:16:17
- date last changed
- 2022-06-28 10:16:17
@misc{9090298,
abstract = {{This thesis considers an investigation into the possibilities of creating a reasonably accurate multiscale material model for paperboard, with geometry based on X-ray scans of small paperboard samples. The modeling takes place in the software Multiscale Designer by Altair Engineering Inc. A representative volume element (RVE) is used to capture the X-ray geometry and represent macroscopic mechanical properties. The RVE consists of fiber and air phases, perfect fiber-fiber bonding assumed, where the fiber phase is assigned transversely isotropic linear elasticity and isotropic hardening plasticity. This model is considered to behave consistently across different tested X-ray geometries. The results show that it is possible to achieve a reasonably good model fit for in-plane uniaxial tensile tests in MD, CD and 45 degree loading directions.
Further, the model is also exported as a user material in Abaqus, where simulations are performed to compare the multiscale model with a previously established continuum based model. Although the simulation results do not agree completely, there are some similarities, which is promising for further model development.
The multiscale modeling workflow can be automatized to some degree. For this, one needs to ensure the correct content and format of text files used as input in the modeling analyses.
The model may be further developed with additional features such as fiber-fiber bonds, and calibrated towards other and more complex load cases.}},
author = {{Boman, Gustav}},
language = {{eng}},
note = {{Student Paper}},
series = {{TFHF-5000}},
title = {{Multiscale mechanical modeling of paperboard}},
year = {{2022}},
}