Cosmos Express: Sy and Su values and conversion incorrect

- K
- Kman
  
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posted
20 years ago

Tue, Feb 17, 2004 7:32 PM

I reviewed the physical material properties for Alloy steel in the SolidWorks materials library. It appears the yield strength (Sy) and tensile strength (Su) values are very high for even the strongest of materials. Or maybe there is some super high strength material out there I'm not familiar with.

Alloy Steel values from SolidWorks material library Su=7.238e+008 N/M^2 Sy=6.204e+008 N/M^2

What material is SW basing there Su and Sy values on?

Second concern is when I generate the html report the Yield Strength value printed for Alloy steel is given as 90,000 PSI. Converting this to N/M^2 does not equal an Sy of 6.204e+008 N/M^2

Conversion Formula: PSI = 0.0001450377 x N/M^2

Can someone confirm this? Obviously this is of critical concern for those of us using CosmosExpress.

Kman

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- R
- Ramesh Ramalingam
  
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posted
20 years ago

Wed, Feb 18, 2004 7:42 PM

Hello: Alloy steel properties are very generic. Please make sure you check what grade and heat treatment of alloy steel you plan to use for your model. The one in SolidWorks library is for quenched and tempered low-alloy steel. It yield is 620-690 MPa or 10^6 N/m^2 = 90000 psi.

Conversion factor: 1 psi = (2.2046/9.80665)* (25.4/1000)^2 N/m^2 =

0.000145036

-Ram

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