But instead of the energy being concentrated in one place, the holes provide many weak spots that all absorb energy as they break, says Vincent. You are controlling the places the wood breaks, and it can then absorb more , more safely.
The researchers believe the principle could be applied to any material- example, to manufacture lighter and more protective packaging. It could be used in car bumpers, crash barriers and armour for military vehicles, says Ulrike Wegst, the Max Plank Institute for Mental Research in Stuttgart. But she emphasizes that you to design the substance with the direction of force in mind. The direction of loading is crucial, she says.
1 A in B since C for D at
2 A or B although C and D despite
3 A down B over C up D into
4 A knew B concluded C saw D thought
5 A no B per C each D every
6 A it B the idea C they D spruce
7 A If B Just C Only D Rarely
8 A effected B beaten C slapped D affected
9 A behind B beyond C for D in
10 A which B there C that D where
11 A water B air C energy D safety
12 A among B in C as D for
13 A also B besides C else D yet
14 A over B at C around D on
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