Design and Manufacture of Energy Absorbing Materials

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    12-Nov-2014

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Design and Manufacture of Energy Absorbing Materials by Eric Duos

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  • 1. LLNL-PRES-654659This work was performed under the auspices of theU.S. Department of Energy by Lawrence LivermoreNational Laboratory under contract DE-AC52-07NA27344.Lawrence Livermore National Security, LLCEric Duoss, Engineer

2. Defense/Aerospace Sporting/Consumer Goods Packaging/Transportation Dampen shock and vibrations Distribute and relieve stress Maintain relative positioning Mitigate the effect of size variationLawrence Livermore National Laboratory LLNL-PRES-654659 2 3. 1. Difficult to control mechanical properties2.Exhibit non-uniform properties3. Little control over directional properties4.Difficult to develop predictive modelsLawrence Livermore National Laboratory LLNL-PRES-654659 3 4. Additive Manufacturing enables the ability to pattern cellular materialswith controlled, complex architectures. We use a 3D printing process calledDirect Ink Writing to produce ordered, cellular elastomers.1. Enable better control of mechanical properties2. Exhibit more uniform properties3. Enable better control over directional properties4. Enable a predictive modeling capabilityLawrence Livermore National Laboratory LLNL-PRES-654659 4 5. Lawrence Livermore National Laboratory LLNL-PRES-654659 5 6. Face centered tetragonal (FCT)Uniaxial compressionSimple cubic (SC)Pre-compression + shearLawrence Livermore National Laboratory LLNL-PRES-654659 6 7. Same base elastomer material Same volume fraction (ordegree of porosity) = ~50% Different printed architectureLawrence Livermore National Laboratory LLNL-PRES-654659 7 8. 0% Simple cubic 500 mm 9. 5% Simple cubic 500 mm 10. 10% Simple cubic 500 mm 11. 15% Simple cubic 500 mm 12. 20% Simple cubic 500 mm 13. 25% Simple cubic 500 mm 14. 0% Face centered tetragonal 500 mm 15. 5% Face centered tetragonal 500 mm 16. 10% Face centered tetragonal 500 mm 17. 15% Face centered tetragonal 500 mm 18. 20% Face centered tetragonal 500 mm 19. 25% Face centered tetragonal 500 mm 20. Same base elastomer material Same volume fraction (ordegree of porosity) = ~50% Different printed architectureLawrence Livermore National Laboratory LLNL-PRES-654659 20 21. FCT structure pre-compressed (25%) and sheared (dynamic strain sweep)Lawrence Livermore National Laboratory LLNL-PRES-654659 22. SC structure pre-compressed (25%) and sheared (dynamic strain sweep)Lawrence Livermore National Laboratory LLNL-PRES-654659 22 23. Lawrence Livermore National Laboratory LLNL-PRES-654659 23 24. Lawrence Livermore National Laboratory LLNL-PRES-654659 24 25. Existing prototypepatent applications filed Currently being scaled up for production Ready for commercialization New designs possible to achieve new performancefor new market applicationsLawrence Livermore National Laboratory LLNL-PRES-65465925 26. Charity Follettfollett2@llnl.govLawrence Livermore National Laboratory LLNL-PRES-654659 26