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# BURST-OUT STRESS, METALLIC PLATE

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## BURST-OUT STRESS, METALLIC PLATE

(OP)
Fellow stress engineers:

Do any of you know of a method for calculating the stresses induced in the ligament by a fastener loaded such that it is tending to burst out through a straight-edge? I have the means to calculate the RF in the form of allowable load divided by acting load, but that's not what I want this time.

Thanks in anticipation.

### RE: BURST-OUT STRESS, METALLIC PLATE

look up "shear tear-out" in Bruhn, Niu, etc

### RE: BURST-OUT STRESS, METALLIC PLATE

(OP)
Thanks, rb1957, but Bruhn & Niu produce the RF I described above. I'm hopiing for a "strength of materials" type approach for estimating stresses in the ligament.

### RE: BURST-OUT STRESS, METALLIC PLATE

i'm not sure what the difference is ... Bruhn calcs the allowable fastener load due to shear tear-out, to be compared with the applied. indeed the allowable load is "just" Fsu*As, (eqn 3, pg D1.6) where As is defined by the geometry of the hole and the edge.

don't see how this is an RF result ?

if you want the allowable stress is Fsu, and shear stress = P/As ...

### RE: BURST-OUT STRESS, METALLIC PLATE

Bit late to the party, however, have you solved your problem?

As suggested above by rb1957, I will check the lug strength for statics. Correct me if I am wrong, but strength of material approach will lead to Net section calculation, which do not consider location of the hole.

Are you looking at performing Fatigue analysis with the re-assessed stress? In which case, I would tend to you lug SN for fatigue analysis.

Let us know if you got something else to evaluate stress in ligament (ESDU etc.)

Best Regards,
SAjet

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