Effects of Cell Morphology and Heat Treatment on Impact Energy Absorption Property of Porous Aluminum Used for Landing Gears of a Small Satellite

2018 ◽  
Vol 17 (0) ◽  
pp. 115-119 ◽  
Author(s):  
Koichi KITAZONO ◽  
Raita TADA ◽  
Yoshikazu SUGIYAMA ◽  
Toko MIURA
Keyword(s):  
Heat Treatment ◽  
Energy Absorption ◽  
Impact Energy ◽  
Cell Morphology ◽  
Absorption Property ◽  
Small Satellite ◽  
Porous Aluminum ◽  
Landing Gears

Impact Energy Absorbing System for Space Lander Using Hemispherical Open-Cell Porous Aluminum

2018 ◽  
Vol 933 ◽  
pp. 337-341 ◽  
Author(s):  
Koichi Kitazono ◽  
Raita Tada ◽  
Yoshikazu Sugiyama ◽  
Toko Miura
Keyword(s):  
Heat Treatment ◽  
Selective Laser Melting ◽  
Impact Energy ◽  
Melting Process ◽  
Compression Tests ◽  
Laser Melting ◽  
Open Cell ◽  
Porous Aluminum ◽  
Suitable Heat Treatment ◽  
Energy Absorbing

Impact energy absorbing system for space lander is an important technology for space exploring missions. Open-cell porous aluminum manufactured through 3D selective laser melting process has been used on the energy absorbing system. Compression tests for cylindrical and hemispherical shaped porous aluminum with different porosities revealed the high potential as an energy absorbing component. It was found that the suitable heat treatment were effective to increase the energy absorbing potential of the porous aluminum.

Effects of Heat Treatment on Compressive Behavior of Porous Aluminum Manufactured by SLM

2018 ◽  
Vol 933 ◽  
pp. 142-147
Author(s):  
Yoshikazu Sugiyama ◽  
Toko Miura ◽  
Koichi Kitazono
Keyword(s):  
Energy Absorption ◽  
Isothermal Holding ◽  
High Energy ◽  
Absorption Property ◽  
Compressive Behavior ◽  
Silicon Phase ◽  
Porous Aluminum ◽  
Unit Cells ◽  
Brittle Fractures ◽  
High Energy Absorption

Porous Al-10Si-0.3Mg alloys are produced by 3D Selective Laser Melting (SLM). The samples with 90, 93 and 96% porosities consist of octahedron unit cells. As-built samples showed low energy absorption property due to their brittle fractures. The samples after isothermal holding at 803 K for 6 h showed high energy absorption property. Dendrite silicon phase in as-built samples probably caused brittle fracture of the struts. Moreover, the authors considered that SHT samples are lack of stability on mechanical properties and investigated energy absorption property of aging samples. Hardness of the struts increased after aging at 280, 473 and 523 K. Overaging treatment is effective to increase the plateau region at the expense of strength.

scholarly journals Impact energy absorption of three mouthguard materials in three environments

2010 ◽  
Vol 26 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Darin R. Lunt ◽  
Deborah A. Mendel ◽  
William A. Brantley ◽  
F. Michael Beck ◽  
Sarandeep Huja ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Impact Energy

Effect of SiO2 Nanoparticles on the Mechanical and Low Velocity Impact Properties of Epoxy/Glass Composites

2016 ◽  
Vol 838 ◽  
pp. 29-35
Author(s):  
Michał Landowski ◽  
Krystyna Imielińska
Keyword(s):  
Flexural Strength ◽  
Energy Absorption ◽  
Impact Energy ◽  
Epoxy Matrix ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Nanoparticle Suspension ◽  
Impact Properties ◽  
Velocity Impact ◽  
The Impact

Flexural strength and low velocity impact properties were investigated in terms of possibile improvements due to epoxy matrix modification by SiO2 nanoparticles (1%, 2%, 3%, 5%, 7%wt.) in glass/epoxy laminates formed using hand lay-up method. The matrix resin was Hexion L285 (DGEBA) with Nanopox A410 - SiO2 (20 nm) nanoparticle suspension in the base epoxy resin (DGEBA) supplied by Evonic. Modification of epoxy matrix by variable concentrations of nanoSiO2 does not offer significant improvements in the flexural strength σg, Young’s modulus E and interlaminar shear strength for 1% 3% and 5% nanoSiO2 and for 7% a slight drop (up to ca. 15-20%) was found. Low energy (1J) impact resistance of nanocomposites represented by peak load in dynamic impact characteristics was not changed for nanocompoosites compared to the unmodified material. However at higher impact energy (3J) nanoparticles appear to slightly improve the impact energy absorption for 3% and 5%. The absence or minor improvements in the mechanical behaviour of nanocomposites is due to the failure mechanisms associated with hand layup fabrication technique: (i.e. rapid crack propagation across the extensive resin pockets and numerous pores and voids) which dominate the nanoparticle-dependent crack energy absorption mechanisms (microvoids formation and deformation).

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