| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
In order to reduce weight of cars and improve the rigidity and the collision safety, as a material technique, a new ultra-light porous metal has been developed. The conventional porous metals like foamed aluminum or metallic hollow sphere (MHS) structure have some problems on the process cost, homogeneity and controllability of material and tensile and bending strength. So, we proposed a ball-chain type MHS structure to solve them. Since the hollow spheres used in this structure are precisely and inexpensively mass-produced by metal sheet forming using a punch and die, the structure is very homogenous and the production cost is lower. By changing the dimensions of a punch and a die and metal sheet thickness, size of hollow spheres can be easily changed to be able to control the performance widely. The spheres are point-connected in the conventional MHS structure, while the proposed spheres are strongly connected by a wide bridge and the tensile and bending strengths are also high.
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