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Experimental and Numerical Study of Adhesion in Packaging Materials

Postlind, Elin LU and Ekström, Anna LU (2016) In ISRN LUTFD2/TFHF-16/5208-SE(1-93) FHL820 20161
Solid Mechanics
Abstract
The peel test is a widely used method for evaluating adhesion in packaging materials. However, the result from a peel test is affected by more factors than only the adhesion. A method, based on beam theory, for calculating the adhesion considering these factors was used and evaluated. This was done by performing peel tests for different materials and peel angles. To obtain more knowledge about how the material deforms during a peel test, high-magnification 3D images of samples with an applied force on the peel arm were produced using X-ray tomography. Peel tests were also simulated in Abaqus, trying to replicate the peel force and the geometry from the experimental peel tests and the X-ray images.

The beam theory based method for... (More)
The peel test is a widely used method for evaluating adhesion in packaging materials. However, the result from a peel test is affected by more factors than only the adhesion. A method, based on beam theory, for calculating the adhesion considering these factors was used and evaluated. This was done by performing peel tests for different materials and peel angles. To obtain more knowledge about how the material deforms during a peel test, high-magnification 3D images of samples with an applied force on the peel arm were produced using X-ray tomography. Peel tests were also simulated in Abaqus, trying to replicate the peel force and the geometry from the experimental peel tests and the X-ray images.

The beam theory based method for calculating the adhesion turned out not to be applicable for compliant peel arms, since they did not behave like beams. This was clearly visible in the X-ray images. For the stiffer peel arm used, the X-ray images showed a more beamlike behaviour which should imply that the method is more applicable for this material. The simulation of the stiffer peel arm also showed a good resemblance with the experimental results. However, the result for the more compliant materials were more affected by the choice of hardening rule, which made the peel arm stiffer than desired.

It was concluded that X-ray tomography is a helpful tool to determine if the deformations of peel arms can be described by beam theory and consequently if the present method for calculating the adhesion can be used. Furthermore, reversed loading occurs in peel tests and therefore material hardening was found to play a significant role for the material behaviour. (Less)
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author
Postlind, Elin LU and Ekström, Anna LU
supervisor
organization
course
FHL820 20161
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Adhesion, Peel test, Abaqus, Cohesive elements, X-ray tomograpgy, Packaging material
publication/series
ISRN LUTFD2/TFHF-16/5208-SE(1-93)
report number
5208
language
English
id
8884322
date added to LUP
2016-06-29 10:44:39
date last changed
2016-06-29 10:44:39
@misc{8884322,
  abstract     = {The peel test is a widely used method for evaluating adhesion in packaging materials. However, the result from a peel test is affected by more factors than only the adhesion. A method, based on beam theory, for calculating the adhesion considering these factors was used and evaluated. This was done by performing peel tests for different materials and peel angles. To obtain more knowledge about how the material deforms during a peel test, high-magnification 3D images of samples with an applied force on the peel arm were produced using X-ray tomography. Peel tests were also simulated in Abaqus, trying to replicate the peel force and the geometry from the experimental peel tests and the X-ray images.

The beam theory based method for calculating the adhesion turned out not to be applicable for compliant peel arms, since they did not behave like beams. This was clearly visible in the X-ray images. For the stiffer peel arm used, the X-ray images showed a more beamlike behaviour which should imply that the method is more applicable for this material. The simulation of the stiffer peel arm also showed a good resemblance with the experimental results. However, the result for the more compliant materials were more affected by the choice of hardening rule, which made the peel arm stiffer than desired.

It was concluded that X-ray tomography is a helpful tool to determine if the deformations of peel arms can be described by beam theory and consequently if the present method for calculating the adhesion can be used. Furthermore, reversed loading occurs in peel tests and therefore material hardening was found to play a significant role for the material behaviour.},
  author       = {Postlind, Elin and Ekström, Anna},
  keyword      = {Adhesion,Peel test,Abaqus,Cohesive elements,X-ray tomograpgy,Packaging material},
  language     = {eng},
  note         = {Student Paper},
  series       = {ISRN LUTFD2/TFHF-16/5208-SE(1-93)},
  title        = {Experimental and Numerical Study of Adhesion in Packaging Materials},
  year         = {2016},
}