Open cell metal foam
The holes are connected, as if they were incomplete,
A notched bubble is called an open cell metal foam.
2. Closed cell metal foam
The surface of the hole is solid, that is to say each hole
The closed hole is completely separated from the surrounding hole.
Metal foam.
Closed cell metal foam can be used as a cushioning material, as well as in bicycle helmets, with a higher impact load.
Compared to many polymer foams, the metal foam deforms after impact and can therefore only be used once.
Metal foam
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Reference
If the state of the open cell metal foam is larger in the case of a bubble volume, the overall weight is lighter, but
The area of the bubble and the bubble contact surface is large. Take the steel bar as a metaphor, the same diameter, thickness, and length
The easier it is to bend, the lower the cushioning capacity, and the easier it is to damage. But it can achieve a reduction in the amount of metal used, heavy
The purpose of reducing the amount, so that it can be applied to the aerospace technology; in contrast, in the case of a small bubble volume
The contact surface between the bubbles is small, the supporting force is high, the density between the bubbles is large, and they are connected to each other.
Strong cushioning ability, can be applied to helmets, car bumpers, doors, etc., but unfortunately not after impact
Can be restored.
Everyone has heard of memory alloys. When the alloy is placed at a high temperature and temperature, it will be placed for a while.
After cooling, and having a shape variable that is several times larger than other metals, and heating after changing the line, he will return
Return to the original look. This alloy may complement the shortcomings of the previous section of metal foam, if successful,
It will be one of the goals of technological development.