Inertial stabilization of flexible polymer micro-lattice materials
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Soft micro-lattice materials with different lattice geometries were fabricated using a self-propagating photopolymer waveguide process. The parent polymer was characterized by dynamic mechanical analysis and the glass transition temperature shifted with equivalent strain rate. Quasi-static and dynamic compression tests were subsequently carried out to investigate the inertial stabilization of lattice member buckling as a function of strain rate and structural geometry (e.g. relative density and lattice aspect ratio). A high-speed digital camera was used to record the progression of deformation and failure events during compression. The micro-lattice structures exhibited super compressibility and increased strength. The observed strength increase, particularly for high aspect ratio and high strain rate, was attributed to inertial stabilization.
KeywordsHigh Strain Rate Dynamic Mechanical Analysis Increase Strain Rate Lattice Geometry Parent Polymer
S. Nutt acknowledges support from the Mc. Gill Composites Center. L.Z. Wu would like to thank the Major State Basic Research Development Program of China (973 Program, No. 2011CB610303). S. Yin gratefully acknowledges the support from China Scholarship Council (CSC) during the visit at University of Southern California.
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