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steel 4130
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#2
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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 Ò¿Ó¬ |
#3
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Wicks aircraft catalog gives two values for 4130:
min tensile (breaking) 95,000 and min yield (where it starts distorting) 75,000. Usually the initial yielding will have quite a bit of strength giving you a chance to get back down. But repeated cycles will weaken it and rupture. Check the structure for any cracks and fix it. ---------------------------------------------------- Paul Lee, SQ2000 canard project: www.abri.com/sq2000 Philippe Vessaire wrote in message -moi... Hello, when I read 90,000 lb/sqi for strength, is it just before the part is broken or is it the elastic limit? Thanks |
#4
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On Sat, 18 Oct 2003 03:46:35 +1300, "Cam" wrote:
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... Cam, While that might sound like a good (and conservative) approach to the design, he probably wants to build something that will be able to get off the ground. If your suggested technique were to be used throughout the aircraft, it would probably be too heavy to fly. O-(some qualifications)Ring |
#5
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