Why magnesium alloy????

Started Apr 19, 2013 | Discussions thread
Joseph S Wisniewski Forum Pro • Posts: 34,130
Strength, and I've flown a Q2

Pradipta Dutta wrote:

sandy b wrote:

Football helmets, motorcycle helmets, car body parts, M16 stock/receiver. None of them have magnesium. Plastics have many advantage over metal. Thermodynamically more stable. Light, strong and they have give. Tooling and material expenses drastically lower.

And airplanes are made of metal.

Mainly because it can be pop-riveted, while fiberglass, carbon fiber, or filled resins have to be clamped or glued. And it's easier to dismantle (screws, pemnuts, etc) and reassemble.

I've flown a composite aircraft, a Q2, and been up in a larger composite craft, a Rutan "Defiant". I've also been up in a plane with fiberglass wings, three or four ultralights with nylon under tension for wings, and a wooden

Regardless of how many examples you cite, you can't deny that magnesium alloy is stronger than plastic.

Of course we can deny that. Any way you care to slice it, it's not true.

Look at strength for a given volume.

  • 275 MPa magnesium
  • 1240 MPa carbon filled epoxy
  • 3640 MPa Kevlar
  • 4200 MPa tension wound carbon fiber

Or look at strength per unit of weight.

  • 158 kN·m/kg magnesium
  • 588 kN·m/kg balsa wood (just for grins)
  • 785 kN·m/kg carbon filled epoxy
  • 2458 kN·m/kg tension wound carbon fiber
  • 2514 kN·m/kg Kevlar
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Rahon Klavanian 1912-2008.
Armenian genocide survivor, amazing cook, scrabble master, and loving grandmother. You will be missed.
Ciao! Joseph

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