Stress Relaxation Study of Paper and Plastic film based Packaging Material
Independent thesis Advanced level (degree of Master (Two Years))Student thesis
In this master degree thesis the time dependent deformation of packaging material is studied. Mechanical experimental tests were carried out to monitor the stress decreasing rate on paper. Several viscoelastic models were constructed using various theories and compared with the obtained experimental stress relaxation. The results showed that the modified two-unit Maxwell model suits the best to describe the relaxation behavior of the material in discussion. MATLAB was used to derive the stress relaxation equations which indicate the time dependent stress relaxation behavior of the materials for constant elongation. FE models were created by ABAQUS for analyzing the stress relaxation behavior of the paperboard and the laminate. The simulation results were then compared with the experimental results and the theoretical viscoelastic model. Additionally, specimens with a side crack were also studied.
Place, publisher, year, edition, pages
2009. , 56 p.
Stress Relaxation, Viscoelastic Model, Elastic Modulus Relaxation, Tensile test, FE-modeling
IdentifiersURN: urn:nbn:se:bth-3285Local ID: oai:bth.se:arkivexB530ED707533868EC12575D900460808OAI: oai:DiVA.org:bth-3285DiVA: diva2:830586
Kao-Walter, Dr. Sharon
C/O Ramendu Bhusan Roy, Avijatri-13, Jail Road, Sunamganj, 3000, Bangladesh2015-04-222009-06-182015-06-30Bibliographically approved