Thermographical analysis of paper during tensile testing and comparison to digital image correlation
2016 (English)Report (Other academic)
The thermal response in paper has been studied using thermography. It was observed that an inhomogenous deformation pattern arose in the paper samples during tensile testing. In the plastic regime a pattern of warmer streaks could be observed in the samples. On the same samples digital image correlation (DIC) was used to study local strain fields. It was concluded that the heat patterns observed by thermography coincided with the deformation patterns observed by DIC. Due to the fibrous network structure paper has an inhomogenous microstructure, called formation. It could be shown that the formation was the cause of the inhomogenous deformations in paper. Finite element simulations were used to show how papers with different amount of homogeneity would deform. Creped papers, where the strain at break has been increased, were analysed. For these paper it was seen that an overlaid permanent damage was created during the creping process. During tensile testing this was recovered as the paper network structure was strained.
Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. , 23 p.
TRITA-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0595
Paperboard, Elastic-plastic properties, In-plane heterogeneity, Thermography, Digital image correlation, Formation, Finite element method
Paper, Pulp and Fiber Technology
Research subject Solid Mechanics
IdentifiersURN: urn:nbn:se:kth:diva-185911OAI: oai:DiVA.org:kth-185911DiVA: diva2:924552
NQC 20162016-04-282016-04-282016-04-29Bibliographically approved