steel E variation <30,000,000 psi
steel E variation <30,000,000 psi
(OP)
There is a report here that physical properties testing on a steel shaft (mat'l probably hot rolled 1140 annealed) indicated E=26,000,000 psi.
I understand metal physical properties can not be counted on to be sharply defined numbers, but instead are a range. And, that most tables do not differentiate between transverse and longitudinal properties, which I believe can be significant for endurance and yield strength, but had not heard being significant for E.
Still, a test result ~10% low seems "odd," and unfortunately in this case, important.
Anyone have similar experiences?
thanks,
Dan T
I understand metal physical properties can not be counted on to be sharply defined numbers, but instead are a range. And, that most tables do not differentiate between transverse and longitudinal properties, which I believe can be significant for endurance and yield strength, but had not heard being significant for E.
Still, a test result ~10% low seems "odd," and unfortunately in this case, important.
Anyone have similar experiences?
thanks,
Dan T





RE: steel E variation <30,000,000 psi
However, the largest variations I have seen are from the test method used. If the elastic modulus was determined by strain measurement, the extensometer accuracy must be scrutinized. The small elastic deflection during a tension test may not be the best way to determine elastic modulus.
If elastic modulus needs to be known with accuracy, try multiple test methods. Shear, tension, bending modes, and longer sample length to increase the elastic deflections.
Regards,
Cory
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RE: steel E variation <30,000,000 psi
rp
RE: steel E variation <30,000,000 psi
Under normal test methods coming up with 26 instead of 29 is not unexpected.
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Plymouth Tube
RE: steel E variation <30,000,000 psi
Dan T