Nominal tensile and shear strengths for A193 SS Bolts

[tslewis]

Can any one tell me where I can find the nominal design tensile and shear strengths for a A193 stainless steeel bolt?

I want to use LRFD design.

The ASCE standard only gives tables for the nominal tensile and shear strengths for some types of stainless steel - Table 6.

The ASTM manual only gives the ultimate tensile design strength - VERY ANNOYING!

thanks

Steve

 

[CoryPad]

Steve,

ASTM A 193/A 193M includes many different classes, so you need to be more specific. This specification does show the minimum tensile yield strength for every class. It does not include any shear strength information, so you will need to ask the supplier for the information, perform your own testing, or use an approximation - 0.6 * UTS is common for metallic materials, although austenitic stainless steels can have a value near 0.8. You can obtain this standard from ASTM International at:

http://www.astm.org

Regards,

Cory

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

 

[unclesyd]

Though I haven't looked up your specific request, try:

http://www.marfas.com/

They have lot of data not normaly found on one web site.
Be sure to check the lower left corner box for additional information.

As "CoryPad" stated you can use the .6-.8 of UTS. I would stay with the .6 or .62 as we used. The reason is that we found a very large effect from strain rates on the shear strength values of threaded fasteners. This was actual testing.

 

[tslewis]

Hey guys, wow that was a quick response!

How do I get the nominal tensile strength from the ultimate, Fu? I presume I simply multiply Fu by 0.75?

The reason I ask this is that the AISC LRFD manual uses a nominal design srength for the tensile and shear strengths of a bolt and not the and not the ultimate - Table J3.2, page 16.1-61.

Also, how does the shear strength of a bolt vary when the threads are excluded/included from the shear plane?

thanks

Steve

 

[CoryPad]

tslewis,

The ASTM specification lists minimum mechanical properties. You could use these values for design (many industries do), or you may need to use a specific design code that specifies a "nominal" value. It is up to you to find the appropriate value.

The shear strength question is a frequent one, with some subtle differences in interpretation. I recommend you visit the following site and download the guides available from their first two links:

http://www.boltcouncil.org

Regards,

Cory

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