Energy absorbing materials with isotropic mechanical properties are necessary for landing gears of spacecrafts. Porous Al-10Si-0.3Mg alloys with an acorn shape are designed for JAXA small lander for investigating moon. The ordered cellular structure with the porosity of 94% is manufactured through a powder bed fusion process. Compression tests are carried out on the inclined plane. Acorn shaped porous aluminum alloys showed good energy absorption behavior on the inclined plane up to 20°. In addition, compression tests of the acorn shaped porous aluminum alloys are carried out on the plane with a hemispherical boulder. Experimental results can be explained using a theoretical calculation of the contact area between the acorn shaped specimen and the inclined plane or between the specimen and the boulder. Energy absorption diagram revealed that the absorbed energy became high at the compression on the small size of the boulder. It was found that the acorn shaped porous aluminum alloy had a potential as an energy absorbing material for the small lander on the moon.
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Fujimori et al. (2020) studied this question.
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