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Numerical Approach Technique of Spherical Indentation for Material Property Evaluation of Hyper-elastic Rubber  

Lee, Hyung-Yil (Department of Mechanical Engineering, Sogang University)
Lee, Jin-Haeng (Department of Mechanical Engineering, Sogang University)
Kim, Dong-Wook (Hyundai Engineering)
Publication Information
Elastomers and Composites / v.39, no.1, 2004 , pp. 23-35 More about this Journal
Abstract
In this work, effects of hyper-elastic rubber material properties on the indentation load-deflection curve and subindenter deformation are first examined via finite element (FE) analyses. An optimal data acquisition spot is selected, which features maximum strain energy density and negligible frictional effect. We then contrive two normalized functions, which map an indentation load vs. deflection curve into a strain energy density vs. first invariant curve. From the strain energy density vs. first invariant curve, we can extract the rubber material properties. This new spherical indentation approach produces the rubber material properties in a manner more effective than the common uniaxial tensile/compression tests. The indentation approach successfully measures the rubber material properties and the corresponding nominal stress-strain curve.
Keywords
Hyper-elastic Rubber; Spherical Indenter; Material Property; Strain Energy Density; Invariant of Principal Stretches;
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