Experimental set-up for determination of the large-strain tensile behaviour of polymers at low temperatures |
| |
| Institution: | 1. Structural Impact Laboratory (SIMLab), Department of Structural Engineering, NTNU, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway;2. SINTEF Materials and Chemistry, Department of Materials and Nanotechnology, PB 124 Blindern, NO-0314, Oslo, Norway;1. Laboratory of Theoretical and Applied Mechanics, Graduate Programme in Mechanical Engineering, Universidade Federal Fluminense, Rua Passo da PátriCa 156, 24210-240, Niterói, RJ, Brazil;2. Petrobras – Petróleo Brasileiro S.A., Research Center (CENPES), 21941-915, Cidade Universitária - Ilha do Fundão, Rio de Janeiro, RJ, Brazil;1. College of Science, Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing, China;2. Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing Center for Disease Control and Prevention, Beijing, China;3. Chinese Academy of Inspection and Quarantine, Beijing, China;1. LUNAM Université, UMR Université du Maine – CNRS n° 6283, Institut des Molécules et Matériaux du Mans – Département Polymères, Colloïdes et Interfaces, Avenue Olivier Messiaen, 72085 Le Mans Cedex, France;2. ISMANS, Avenue Frédéric Auguste Bartholdi, 72000 Le Mans Cedex, France;1. Department of Polymer Science and Engineering, Hannam University, Daejeon 305-811, Republic of Korea;2. Underground Solutions Inc., Poway, CA, USA |
| |
| Abstract: | In this study, we present a method to determine the large-strain tensile behaviour of polymers at low temperatures using a purpose-built temperature chamber made of polycarbonate (PC). This chamber allows for several cameras during testing. In our case, two digital cameras were utilized to monitor the two perpendicular surfaces of the test sample. Subsequently, the pictures were analysed with digital image correlation (DIC) software to determine the strain field on the surface of the specimen. In addition, a thermal camera was used to monitor self-heating during loading. It is demonstrated that the PC chamber does not influence the stress-strain curve as determined by DIC. Applying this set-up, a semi-crystalline cross-linked low-density polyethylene (XLPE) under quasi-static tensile loading has been successfully analysed using DIC at four different temperatures (25 °C, 0 °C, ?15 °C, ?30 °C). At the lower temperatures, the conventional method of applying a spray-paint speckle failed due to embrittlement and cracking of the spray-paint speckle when the tensile specimen deformed. An alternative method was developed utilising white grease with a black powder added as contrast. The results show a strong increase in both the Young’s modulus and the flow stress for decreasing temperatures within the experimental range. We also observe that although the XLPE material is practically incompressible at room temperature, the volumetric strains reach a value of about 0.1 at the lower temperatures. |
| |
| Keywords: | XLPE Digital image correlation (DIC) Tensile test Low temperatures Large strains Polymeric material Temperature chamber |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
