Continuum damage modeling of delamination in paperboard
(2021) In TFHF-5000 FHLM01 20211Department of Construction Sciences
Solid Mechanics
- Abstract
- This work concerns the creasing and folding of a continuum paperboard material model developed by Eric Borgqvist. Creasing is an operation that induces permanent deformation in the material, undertaken for the folding to be performed along a straight fold line without any in-plane cracks. The material model concerned is complex and involves a high degree of anisotropy, and it has earlier been proven to be able to predict many of the material behaviours observed during experimental testing. However, not all test setups are predicted accurately. One such setup is the folding of creased paperboard. This issue is considered in this work.
To give a short background of the concerned problem, it is stated that the paperboard is an anisotropic... (More) - This work concerns the creasing and folding of a continuum paperboard material model developed by Eric Borgqvist. Creasing is an operation that induces permanent deformation in the material, undertaken for the folding to be performed along a straight fold line without any in-plane cracks. The material model concerned is complex and involves a high degree of anisotropy, and it has earlier been proven to be able to predict many of the material behaviours observed during experimental testing. However, not all test setups are predicted accurately. One such setup is the folding of creased paperboard. This issue is considered in this work.
To give a short background of the concerned problem, it is stated that the paperboard is an anisotropic material which, in a simplified manner, can be viewed as possessing three fundamental material directions. The creasing and folding operations can be undertaken in both in-plane directions of the paperboard, which are called the MD- and CD-direction, respectively. It has earlier been observed that the material model quite well predicts the creasing and folding of uncreased paperboard. However, for the folding of creased paperboard, the material model does not predict the response in a sufficiently satisfying manner - the response is too stiff.
The scope of this work is to investigate if the folding of creased paperboard in the MD-direction can be predicted more accurately by including damage in the material model. The creasing and folding operations are simulated by using the commercial engineering software LS-Dyna, which is an advanced general-purpose simulation software. The introduction of damage is made as an add-on feature to the continuum material model via an LS-Dyna built-in software called eGISSMO. Damage is thus introduced on top of the existing material model. The results in this thesis show that, by introducing damage in LS-Dyna, it is possible to accurately predict the folding response of MD creased paperboard. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9059295
- author
- Jakobsson, Erik LU
- supervisor
- organization
- course
- FHLM01 20211
- year
- 2021
- type
- H3 - Professional qualifications (4 Years - )
- subject
- keywords
- Creasing, Folding, MD-direction, EB material model, LS-Dyna, eGISSMO
- publication/series
- TFHF-5000
- report number
- TFHF-5245
- language
- English
- id
- 9059295
- date added to LUP
- 2021-06-28 16:17:51
- date last changed
- 2021-06-28 16:17:51
@misc{9059295,
abstract = {{This work concerns the creasing and folding of a continuum paperboard material model developed by Eric Borgqvist. Creasing is an operation that induces permanent deformation in the material, undertaken for the folding to be performed along a straight fold line without any in-plane cracks. The material model concerned is complex and involves a high degree of anisotropy, and it has earlier been proven to be able to predict many of the material behaviours observed during experimental testing. However, not all test setups are predicted accurately. One such setup is the folding of creased paperboard. This issue is considered in this work.
To give a short background of the concerned problem, it is stated that the paperboard is an anisotropic material which, in a simplified manner, can be viewed as possessing three fundamental material directions. The creasing and folding operations can be undertaken in both in-plane directions of the paperboard, which are called the MD- and CD-direction, respectively. It has earlier been observed that the material model quite well predicts the creasing and folding of uncreased paperboard. However, for the folding of creased paperboard, the material model does not predict the response in a sufficiently satisfying manner - the response is too stiff.
The scope of this work is to investigate if the folding of creased paperboard in the MD-direction can be predicted more accurately by including damage in the material model. The creasing and folding operations are simulated by using the commercial engineering software LS-Dyna, which is an advanced general-purpose simulation software. The introduction of damage is made as an add-on feature to the continuum material model via an LS-Dyna built-in software called eGISSMO. Damage is thus introduced on top of the existing material model. The results in this thesis show that, by introducing damage in LS-Dyna, it is possible to accurately predict the folding response of MD creased paperboard.}},
author = {{Jakobsson, Erik}},
language = {{eng}},
note = {{Student Paper}},
series = {{TFHF-5000}},
title = {{Continuum damage modeling of delamination in paperboard}},
year = {{2021}},
}