Re:Young's Modulus for Acquamet 17

[mycaprice]

Hi, folks,
Does anyone know Acquamet 17 stainless steel? It is used for propeller shafts in marine industry. Me and lots of people involved in project are having hard times searching for the manufacturer. We need to calculate torque on the shaft, hence we need Modulus of Rigidity or Elasticity.
Thanks for any help.
Mycaprice.

 

[stanislasdz]

Herre a good link

http://www.machinist-materials.com/stainless_table.htm

you can also found a lot of links in google

Stan

 

[CoryPad]

The torque equation requires the shear modulus G. For 17-4 PH stainless steel (which is the generic classification for this alloy), G = 77 GPa.

You can use MatWeb as a resource for this.

http://www.matweb.com

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[unclesyd]

From Western Branch Metals Website. Aqualoy 17 and Aquamet 17 are both 17/4 PH H1150.

Physical Properties (Aqualoy 17 is magnetic)
Density at 75F (24C) 0.284 lbs/in3 (7.87 gm/cm3)
Modulus of Elasticity
Tension 29,100,000 psi (200,600 Mpa)
Torsion (Rigidity) 11,270,000 psi (77,700 Mpa)
Poisson’s Ratio 0.0291


Look at the "Shafting Data Brochure" pdf

http://www.wbmetals.com/

 

[Maui]

The manufacturer is Crucible Materials Corporation. They can be accessed through the following website:

http://www.crucible.com/

The stainless expert at Crucible is William Nesspor, and I recommend that you speak with him directly.

The modulus of elasticity E for the vast majority of iron based alloys falls within the range of 28,000 ksi to 32,000 ksi. The stainless grades tend to favor the lower side of this range, and the moduli are relatively insensitive to heat treatment. The shear modulus G can be calculated for an isotropic elastic solid from the relationship

G = 2E/(1 + v)

where E is the elastic modulus and v is Poisson's ratio.


Maui

 

[Maui]

The 2 which appears in the equation I provided should appear in the denominator, not the numerator. The correct relationship is

G = E/[2(1 + v)]

The Poisson ratio provided by Unclesyd should be 0.291, not 0.0291. If these errors are corrected, the calculated value of G is 11,270,000 ksi, in agreement with the value quoted by Unclesyd.

Maui

 

[unclesyd]

Maui,
Thanks,
The problem was me blind copying numbers without thinking. I have sent an E-mail to Western Branch Metals pointing out the error in the brochure.