That would be UTS , ultimate tensile strenght. I think yeild
strength is at what point the material starts stretching.

Personally, I've had a problem with numbers, so i tend to
do destructive testing with a pull ram and a pressure gauge. As far as
chromolly steel goes, it seems to "snap"
right at the point of stretching. So I'd imagine its Yeild Strength is very
close to its UTS .

If you see two numbers for strength, pick the lesser one and halve it , and
design from that .

Cheers (no qualifications) Cam...


when I read 90,000 lb/sqi for strength,
is it just before the part is broken or is it the elastic limit?

Thanks
--
Philippe Vessaire ҿӬ