Dimpled fastener design allowables

For spacecraft engineering? I'm pretty sure dimpled fastener installs are prohibited for spacecraft.

YOU will have to test and develop Your own MMPDS-equivalent allowables.

NOTE.
I know with ~99% certainty that 130-Deg dimples [double-dimples or dimples-into-countersinks] 'mechanical allowables' [~=MMPDS] have NOT been characterized.
I've never heard of dimpling Titanium sheet... unsure how You would even do it 'consistently' for a shallow 130-Dimple... and get a clean-round hole. VERY HOT and enlarge the hole on install????


Regards, Wil Taylor
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Agree with Wil, you are very unlikely to find industry data or a method to calculate joint strength for that configuration. You will need to conduct specific joint tests for your configuration.

ditto, this is such an old technology ... doesn't mean it's "wrong" ... it can be an effective way of joining thin sheet.

you may find some data in old Mil Handbook 5 ... I seem to remember some tables there.

A suggestion ... you are almost certainly going to limited by sheet failures, so maybe use rivets (lighter) ?

Have you considered welding ? spot or line ??

another day in paradise, or is paradise one day closer ?

Based on a previous conversation on Eng-Tips:


Consider using chemically-milled sheets so that you can fully countersink at the fasteners but still maintain thin panels between fastener rows.

that'd still add mass.

why CSK ? why not protruding head ? Even if covered ...
1) push fastener through the covering layer, or
2) recess (or thru-hole) in the covering layer (to clear the head)

another day in paradise, or is paradise one day closer ?