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Microstructure and crystal plasticity in aluminium foil

Duse, Oscar LU and Szekely, Robert (2017) In ISRN LUTFD2/TFHF-17/5217-SE(1-60) FHL820 20171
Solid Mechanics
Abstract
A beverage package is exerted to different loading conditions during its lifetime. Today, there is limited knowledge on material responses on a micro scale and how these affect the macroscopic behaviour in general. Tetra Pak® produces packaging material consisting of several layers of materials, such as polymers, paperboard and aluminium foil. This master’s thesis focuses on the aluminium foil, more specifically by incorporating the microstructure when modelling the material by utilising a crystal plasticity (CP) framework. The model is based on the single crystal properties of pure aluminium and a homogenisation approach is adopted to generalise the model also to aluminium polycrystals. Two different types of hardening models are... (More)
A beverage package is exerted to different loading conditions during its lifetime. Today, there is limited knowledge on material responses on a micro scale and how these affect the macroscopic behaviour in general. Tetra Pak® produces packaging material consisting of several layers of materials, such as polymers, paperboard and aluminium foil. This master’s thesis focuses on the aluminium foil, more specifically by incorporating the microstructure when modelling the material by utilising a crystal plasticity (CP) framework. The model is based on the single crystal properties of pure aluminium and a homogenisation approach is adopted to generalise the model also to aluminium polycrystals. Two different types of hardening models are implemented and compared. Material parameters for each model are calibrated in an effort to virtually generate the behaviour of aluminium foil. To verify the model, the virtual responses are compared to experimental data for uni-axial tensile tests by means of the coefficient of determination.

The model has some difficulties with replicating the experimental data for a single crystal. For a polycrystal, however, the model response agrees better with experimental data which is most probably due to a homogenisation effect. It is clearly shown that the texture input is of high importance for the overall material response. It can be concluded that it is imperative to understand the material characteristics inherited from the aluminium foil production process on a micro scale, and that the implementation of a crystal plasticity framework is a powerful approach when modelling aluminium foil in an effort to understand its macroscopic behaviour. (Less)
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author
Duse, Oscar LU and Szekely, Robert
supervisor
organization
course
FHL820 20171
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
Aluminium foil, crystal plasticity, microstructure, texture, EBSD
publication/series
ISRN LUTFD2/TFHF-17/5217-SE(1-60)
report number
TFHF-5217
other publication id
ISRN LUTFD2/TFHF-17/5217-SE(1-60)
language
English
id
8912516
date added to LUP
2017-06-14 12:07:17
date last changed
2017-06-14 12:07:17
@misc{8912516,
  abstract     = {A beverage package is exerted to different loading conditions during its lifetime. Today, there is limited knowledge on material responses on a micro scale and how these affect the macroscopic behaviour in general. Tetra Pak® produces packaging material consisting of several layers of materials, such as polymers, paperboard and aluminium foil. This master’s thesis focuses on the aluminium foil, more specifically by incorporating the microstructure when modelling the material by utilising a crystal plasticity (CP) framework. The model is based on the single crystal properties of pure aluminium and a homogenisation approach is adopted to generalise the model also to aluminium polycrystals. Two different types of hardening models are implemented and compared. Material parameters for each model are calibrated in an effort to virtually generate the behaviour of aluminium foil. To verify the model, the virtual responses are compared to experimental data for uni-axial tensile tests by means of the coefficient of determination.

The model has some difficulties with replicating the experimental data for a single crystal. For a polycrystal, however, the model response agrees better with experimental data which is most probably due to a homogenisation effect. It is clearly shown that the texture input is of high importance for the overall material response. It can be concluded that it is imperative to understand the material characteristics inherited from the aluminium foil production process on a micro scale, and that the implementation of a crystal plasticity framework is a powerful approach when modelling aluminium foil in an effort to understand its macroscopic behaviour.},
  author       = {Duse, Oscar and Szekely, Robert},
  keyword      = {Aluminium foil,crystal plasticity,microstructure,texture,EBSD},
  language     = {eng},
  note         = {Student Paper},
  series       = {ISRN LUTFD2/TFHF-17/5217-SE(1-60)},
  title        = {Microstructure and crystal plasticity in aluminium foil},
  year         = {2017},
}