pinned connection bearing stress

[mechtools]

I know this has been somewhat addressed but i often see it addressed as it relates to a bolted connection.

I want to confirm that allowable bearing stress for a pinned connection can be treated in a similar fashion as a bolted connection where allowable bearing stress equals a factor of 1.2 to 1.5 times the tensile yield.

Actual load tests confirm that we see more than 2 times this allowable bearing load before hole deformation which backs this up, however i would just like the theoretical argument to add to the test results.

thank you

 

[CoryPad]

Yes, pin loading is actually how bearing stress is tested. You can learn more in MIL-HDBK-5 METALLIC MATERIALS AND ELEMENTS FOR AEROSPACE VEHICLE STRUCTURES and ASTM E 238 Standard Test Method for Pin-Type Bearing Test of Metallic Materials.

Regards,

Cory

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

 

[mechtools]

thanks cory.

just to confirm, i can then assume that ALLOWABLE bearing stress with a pin load (not bolt or rivet) lies somewhere in the range of 1.2 to 1.5 times the tensile yield.

This is in fact what i believe to be true, but i just want confirmation on the theoretical. I also believe that the ALLOWABLE bearing load incorporates a safety factor of about 2 - do you also agree with that?

Test data we have is in agreement with these assumptions but a source indicated to me that the above relationship may only apply to a bolted connection where friction plays a role.

 

[CoryPad]

The allowable bearing yield stress with a pin load USUALLY is about 1 to 2 times the tension/compression yield stress. You can look in MIL-HDBK-5 and get actual values. For alloy steels, it is ~ 1.7. You can get MIL-HDBK-5 free at:

http://assist.daps.dla.mil/quicksearch/

The safety factor varies with application and it is meaningless to speculate on a "typical" value.

Regards,

Cory

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

 

[mechtools]

thanks again, cory

 

[mechtools]

o.k. i'm not done beating this horse - sorry.

does anyone have a link to material property specs that would actually list the ultimate bearing strength and the yield bearing strength for grade 50 A653 steel?

I've been searching and i find that these values are very seldomly listed - probably due to e/D and t/D variability. I have found it for some steel alloys and some aluminum but I can't find it for Grade50 A653 steel.

The values I have found for other materials seem to show that the yield bearing is about 1.75 times the tensile yield.

thanks

I think that due to the fact that i have a pinned joint with no benefit of wall stiffening from a bolted connection i want to work from specified bearing yield to obtain WLL.

 

[CoryPad]

This type of information is not published widely/at all. I think you should estimate based on MIL-HDBK-5 data if your application is not critical, or conduct your own testing if it is critical.

Regards,

Cory

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