Kristina Sornikova
Aerospace
Dear all, if any of you experts know of material SN curves for A356 T6 Al alloy, preferably public aerospace sources, and multiple Kt curves, please post link. Thank you...
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A356-T6 Al Casting S-N Curves 1
- Thread starter Kristina Sornikova
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KS... You have provided scanty/no information for most of us to assist You.
CAUTION: Assume this issues is for relatively 'new' castings. Castings that have been in-service for a long-while can be 'wild cards' due to and heavily 'weathering' [microscopic moisture intrusion] since older castings were rarely 'sealed' with out 'cause'.
What 'specifications' and what 'casting quality classification'?
Environmentally sealed or unsealed.
Do Your new castings come with cast-in metallurgical and mechanical test coupons... or... other features [thick pads] that allow recurrent testing ['each' or random/statistical, etc]?
Complexity of casting demands extra Knowledge. Starters.
Aerospace Structural Metals Handbook... Section Code 3105... 356.0 and A356.0 [castings]
AFWAL-TR-84-4117 Manufacturing Methods for Process Effects on Aluminum Casting Allowables
WL-TR-91-4111 Durability and Damage Tolerance of Aluminum Alloy Castings
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]
CAUTION: Assume this issues is for relatively 'new' castings. Castings that have been in-service for a long-while can be 'wild cards' due to and heavily 'weathering' [microscopic moisture intrusion] since older castings were rarely 'sealed' with out 'cause'.
What 'specifications' and what 'casting quality classification'?
Environmentally sealed or unsealed.
Do Your new castings come with cast-in metallurgical and mechanical test coupons... or... other features [thick pads] that allow recurrent testing ['each' or random/statistical, etc]?
Complexity of casting demands extra Knowledge. Starters.
Aerospace Structural Metals Handbook... Section Code 3105... 356.0 and A356.0 [castings]
AFWAL-TR-84-4117 Manufacturing Methods for Process Effects on Aluminum Casting Allowables
WL-TR-91-4111 Durability and Damage Tolerance of Aluminum Alloy Castings
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]
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- #3
Kristina Sornikova
Aerospace
Dear Wil,
Thank you for detailed response. I realize I did not put enough info now.
Let us say casting A356-T6, class 12, per MIL-A-21180. The problem is it is hard to find 'material' S-N curves for this material even similar one.
I am looking material S-N curves like in MMPDS. MMPDS has no A356 curves.
Our castings have detail notes on coupon testing etc. Just need to find S-N curves like in MMPDS for this casting.
Thank you for detailed response. I realize I did not put enough info now.
Let us say casting A356-T6, class 12, per MIL-A-21180. The problem is it is hard to find 'material' S-N curves for this material even similar one.
I am looking material S-N curves like in MMPDS. MMPDS has no A356 curves.
Our castings have detail notes on coupon testing etc. Just need to find S-N curves like in MMPDS for this casting.
- Thread starter
- #5
Kristina Sornikova
Aerospace
Thank you Brian, but looking for something official, formal.
EdStainless
Materials
MMPDS won't touch this since the scatter in fatigue with castings is so large.
For one producer, using one method, with their in house chemistry restrictions, and the correct NDT, will yield usable fatigue values.
Ultimately you will need to generate your own to confirm whatever you find out there.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
For one producer, using one method, with their in house chemistry restrictions, and the correct NDT, will yield usable fatigue values.
Ultimately you will need to generate your own to confirm whatever you find out there.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
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