Failure Mechanics in Low-velocity Impacts on Thin Composite PlatesNational Aeronautics and Space Administration, Scientific and Technical Information Branch, 1983 - Composite materials - 23 pages |
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2.0 Center displacement 5208 epoxy resin 7th ply center 8th ply accelerometer aluminum Ball mass cantilever damage was established data for ply deformation mechanics degree of equivalence delamination length delamination patterns Distance from impact double integration Dynamic analysis Eight-ply quasi-isotropic composite energy levels energy of 0.61 Equivalent-damage width establish the degree failure mechanics fiber bundles fiber damage figure 13 graphite in Narmco graphite-epoxy higher modes impact and static impact center impact energy Impact force Impact load impact tests laminate Langley Research Center large deformation load center load-displacement loading energy low-velocity impact lower plies membrane mode analysis Narmco 5208 epoxy NASA off-center strip penetration energy plates of Thornel ply center strip Ply cracking quasi-isotropic composite plates Residual bundle strength Residual strength GPa section A-A shear static and impact Static loading static tests strain energy strain gages strength reduction THIN COMPOSITE PLATES Thornel 300 graphite trace for impact zinc iodide