raymond@io.ame.arizona.edu (Raymond Man) (11/20/89)
From: raymond@io.ame.arizona.edu (Raymond Man) ref:<11529@cbnews.ATT.COM> I did some back of envolpe calculation. A point on the surface of the 5.56mm ball is turning at around 88m/s, (eighty-eight metre per second). To find the stress in the bullet, the material properties and their thickness must be know. Approximating the slug as a fluid with the density of lead (sg 11.4), the stress on the surface is around 88 kg/mm2, or 1,300 psi which is not hard to contain at room temp. by copper tubing of that size. But of course the temp. is real high (who has the knowlegde of the temp. of a slug in flight?) and there are acceration, jolt and areodynamic forces to contend with. Just call me `Man'. Uh-oh. I don't know. raymond@jupiter.ame.arizona.edu