energy absorbing material_duoss
DESCRIPTION
"Design and Manufacture of Energy Absorbing Materials" by Eric Duoss Duoss will discuss an ordered cellular material that has been designed and manufactured using direct ink writing (DIW), an additive manufacturing technology LLNL is developing with its collaborators. The new material is a patterned cellular material that can absorb mechanical energy -- a cushion -- while also providing protection against sheering. This material is expected to find utility in application spaces that currently use unordered foams, such as sporting and consumer goods as well as defense and aerospace.TRANSCRIPT
- 1.LLNL-PRES-654659 This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Lawrence Livermore National Security, LLC Eric Duoss, Engineer
2. Lawrence Livermore National Laboratory LLNL-PRES-654659 2 Defense/Aerospace Packaging/TransportationSporting/Consumer Goods Dampen shock and vibrations Distribute and relieve stress Maintain relative positioning Mitigate the effect of size variation 3. Lawrence Livermore National Laboratory LLNL-PRES-654659 3 1.Difficult to control mechanical properties 2.Exhibit non-uniform properties 3.Little control over directional properties 4.Difficult to develop predictive models 4. Lawrence Livermore National Laboratory LLNL-PRES-654659 4 1. Enable better control of mechanical properties 2. Exhibit more uniform properties 3. Enable better control over directional properties 4. Enable a predictive modeling capability Additive Manufacturing enables the ability to pattern cellular materials with controlled, complex architectures. We use a 3D printing process called Direct InkWriting to produce ordered, cellular elastomers. 5. Lawrence Livermore National Laboratory LLNL-PRES-654659 5 6. Lawrence Livermore National Laboratory LLNL-PRES-654659 6 Face centered tetragonal (FCT) Uniaxial compression Simple cubic (SC) Pre-compression + shear 7. Lawrence Livermore National Laboratory LLNL-PRES-654659 7 Same base elastomer material Same volume fraction (or degree of porosity) = ~50% Different printed architecture 8. 500 mm0% Simple cubic 9. 500 mm5% Simple cubic 10. 500 mm10% Simple cubic 11. 500 mm15% Simple cubic 12. 500 mm20% Simple cubic 13. 500 mm25% Simple cubic 14. 500 mm0% Face centered tetragonal 15. 500 mm5% Face centered tetragonal 16. 500 mm10% Face centered tetragonal 17. 500 mm15% Face centered tetragonal 18. 500 mm20% Face centered tetragonal 19. 500 mm25% Face centered tetragonal 20. Lawrence Livermore National Laboratory LLNL-PRES-654659 20 Same base elastomer material Same volume fraction (or degree of porosity) = ~50% Different printed architecture 21. Lawrence Livermore National Laboratory LLNL-PRES-654659 FCT structure pre-compressed (25%) and sheared (dynamic strain sweep) 22. Lawrence Livermore National Laboratory LLNL-PRES-654659 22 SC structure pre-compressed (25%) and sheared (dynamic strain sweep) 23. Lawrence Livermore National Laboratory LLNL-PRES-654659 23 24. Lawrence Livermore National Laboratory LLNL-PRES-654659 24 25. Lawrence Livermore National Laboratory LLNL-PRES-654659 Existing prototypepatent applications filed Currently being scaled up for production Ready for commercialization New designs possible to achieve new performance for new market applications 25 26. Lawrence Livermore National Laboratory LLNL-PRES-654659 26 Charity Follett [email protected]