A combination of tensile tests, three-point bending tests, compressive tests, and low velocity impact tests was used to analyze the influence of face sheet modification and core discontinuities of composite sandwich panels.
To investigate the optimized composite sandwich panels using HPEPC cores, three types of face sheet materials, ultra-high-performance fiber-reinforced concrete (UHPFRC), UHPC with a glass fiber reinforced polymer (GFRP) mesh, and GFRP were tested with both adhesive mortar and epoxy bond as a glue.
Failure is by the competing modes of face sheet microbuckling, plastic shear of the core, and face sheet indentation beneath the loading rollers.
CONCLUSION: Although compliance in this study was generally high across both measure sets, actual use of the face sheet forms for appropriate patients was lower than the 80% reporting mandate by the Centers for Medicare and Medicaid Services that allows physicians to receive the monetary bonus.
Under in-plane compression and three-point bending, the buckling of face sheets and debonding of hollow cores from the face sheets were observed.
Using a homogenization process and mechanics of materials approach, the equivalent core material properties for the honeycomb core geometry are found, and the material properties of face sheets are obtained by micro/macromechanics. Equivalent material properties of the core and face sheets are then used to evaluate effective torsional stiffness properties of HFRP panels.
The other specimens behaved differently after core cracking, depending on the types of face sheets.
The impact results reveal a better energy absorption when honeycombs with cell walls reinforced with continuous fibres are used; the presence of face-sheets plays an important role in energy absorption only at lower core height.
The dynamic responses of the AFSPs with various combinations of face-sheet materials were analyzed using LS-DYNA.
Effects of face-sheet thickness, core thickness, boundary conditions, adhesive and surface condition of face-sheets on the mechanical response and energy absorption of sandwich panels were discussed.
