A356 Yield Properties
A356 Yield Properties
(OP)
Wondering what others are getting for yield stresses on A356 - T6 aluminum castings. I'm seeing design callouts for up to 240MPa (34.8 ksi). Seems that designers are pushing the limits of the alloy possibly beyond capabilities. From excised bars, I see a wide range, but nothing to the level of confidence to agree to 240MPa as a min.





RE: A356 Yield Properties
RE: A356 Yield Properties
I'm trying to design a suspension component, FEA shows peak stress just under 240MPa. I don't think this can be achieved with A356-T6. Can anyone shoot me some typical A356-T6 data, or even comment on the alloy, or suggest an alternative?
RE: A356 Yield Properties
RE: A356 Yield Properties
From an ALCOA Handbook.38,000 UTS
27,000 YST 0.2%
5 Elg % 1/2" bar in 2" gage length
30,000 SStr Single shear from double shear tests
13,000 FS 500 million cycles of reversed stress
We had thousands of parts made from 356 T-6 and other tempers and we found the published physical data to be a little on the generous side when compared to the real data gleaned from our actual components. Like the Elongation number 5%, we never measured over 3% with the end result being our designs assumed this. At the same time we found the UTS generally to be a measurable quantity higher than published values.
RE: A356 Yield Properties
RE: A356 Yield Properties
RE: A356 Yield Properties
statistical min properties
207 MPA yield, 276 MPa ultimate, 70 fatigue at 107 cycles
Weibull B1 capability
231 yield, 307 ultimate, 90 fatigue
average
259 yield, 329 ultimate, 103 fatigue
The typical HT parameters were solution at 1000F for 12 hours, quench as low as possible, then age at 310 F for 3-5 hours.
RE: A356 Yield Properties
This is typical data I've seen. The key now is to determine the safe min value to sign up to. I prefer to express tensiles as mean - 3*sigma, but won't happen in this case. That's why I have to be more aware of the low flyers as a min spec.
Israelkk, the peak stress is over an area, not a point, and not an edge stress.
Swall, I am considering 357 or maybe 354. I think maybe I can get the properties with a higher Mg content.
Thanks everyone for your comments.