Characterization of a Foam Panel Material - Experimental Study and Model Calibration
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Bestämning av mekaniska egenskaper hos ett material för skumpanel - experiment och modellkalibrering (Swedish)
This study was performed in collaboration with Better Shelter and Vetec. The purpose of the study was to investigate the mechanical properties of a polymeric foam material and to find a suitable material model that can describe the mechanical behavior in future finite element simulations. The study was divided into three parts; characterization of the material, calibration of the material models and verification of the chosen material models.
In the first part the behavior in tension and plane strain compression was tested in two different directions; machine direction (MD) and cross machine direction (CD). An investigation if a temperature dependence is shown by the material was also conducted. A clear anisotropic behavior was observed in the material with the cross machine direction reaching 69% of the ultimate tensile strength in the machine direction in tension. Furthermore the UTS decreased to 60-70% of the UTS in room temperature when the temperature was increased to 50°C. In compression a different stiffness than in tension was recorded together with an anisotropic behavior. Three material models were investigated; Orthotropic elasticity with anisotropic isotropic hardening plasticity, Hyperfoam and Parallel network. The calibrations of the material models were performed in the program MCalibration. The Parallel network model was the only material model capable of describing all of the tested behaviors at once. In order to verify that the models could capture a more complex anisotropic load case a verification test was performed. The material was loaded in tension in a 45° angle from the machine –and cross machine direction. The results were compared to results obtained from simulating the same load case in Abaqus. The Orthotropic elasticity with anisotropic isotropic hardening plasticity showed a good prediction while the Parallel network model showed some flaws.
Place, publisher, year, edition, pages
2016. , 52 p.
Engineering and Technology Applied Mechanics
IdentifiersURN: urn:nbn:se:kth:diva-193603OAI: oai:DiVA.org:kth-193603DiVA: diva2:1033001
Better Shelter; Vetec
Subject / course
Alfredsson, Bo, Proffessor