Design and Manufacture of Energy Absorbing Materials

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Information about Design and Manufacture of Energy Absorbing Materials
Science

Published on September 16, 2014

Author: ipo-admin

Source: slideshare.net

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Design and Manufacture of Energy Absorbing Materials by Eric Duos

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

Defense/Aerospace Sporting/Consumer Goods Packaging/Transportation  Dampen shock and vibrations  Distribute and relieve stress  Maintain relative positioning  Mitigate the effect of size variation Lawrence Livermore National Laboratory LLNL-PRES-654659 2

1. Difficult to control mechanical properties 2.Exhibit non-uniform properties 3. Little control over directional properties 4.Difficult to develop predictive models Lawrence Livermore National Laboratory LLNL-PRES-654659 3

Additive Manufacturing enables the ability to pattern cellular materials with controlled, complex architectures. We use a 3D printing process called “Direct Ink Writing” to produce ordered, cellular elastomers. 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 Lawrence Livermore National Laboratory LLNL-PRES-654659 4

Lawrence Livermore National Laboratory LLNL-PRES-654659 5

“Face centered tetragonal” (FCT) Uniaxial compression “Simple cubic” (SC) Pre-compression + shear Lawrence Livermore National Laboratory LLNL-PRES-654659 6

• Same base elastomer material • Same volume fraction (or degree of porosity) = ~50% • Different printed architecture Lawrence Livermore National Laboratory LLNL-PRES-654659 7

0% “Simple cubic” 500 mm

5% “Simple cubic” 500 mm

10% “Simple cubic” 500 mm

15% “Simple cubic” 500 mm

20% “Simple cubic” 500 mm

25% “Simple cubic” 500 mm

0% “Face centered tetragonal” 500 mm

5% “Face centered tetragonal” 500 mm

10% “Face centered tetragonal” 500 mm

15% “Face centered tetragonal” 500 mm

20% “Face centered tetragonal” 500 mm

25% “Face centered tetragonal” 500 mm

• Same base elastomer material • Same volume fraction (or degree of porosity) = ~50% • Different printed architecture Lawrence Livermore National Laboratory LLNL-PRES-654659 20

FCT structure pre-compressed (25%) and sheared (dynamic strain sweep) Lawrence Livermore National Laboratory LLNL-PRES-654659

SC structure pre-compressed (25%) and sheared (dynamic strain sweep) Lawrence Livermore National Laboratory LLNL-PRES-654659 22

Lawrence Livermore National Laboratory LLNL-PRES-654659 23

Lawrence Livermore National Laboratory LLNL-PRES-654659 24

 Existing prototype—patent applications filed  Currently being scaled up for production  Ready for commercialization  New designs possible to achieve new performance for new market applications Lawrence Livermore National Laboratory LLNL-PRES-654659 25

Charity Follett follett2@llnl.gov Lawrence Livermore National Laboratory LLNL-PRES-654659 26

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