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Automotive Designer Needs S-N Curve for AlMg3

Where can I find an S-N fatigue curve for AlMg3 material? It would be great to have this S-N curve at room temperature, but it would even be greater to receive one for elevated temperatures (e.g. 1000 or 1100 degrees).

Dominic Mariajoseph
Automotive Design and analysis engineer - Leonberg, Baden Würtemberg, Germany
2003

Am I missing something? Al alloys are unsuitable for such elevated temperatures. AlMg3 (Al 5754) begins melting at about 615 C (1139 F). Yield strength at 371 C after holding 10000 hours is roughly 20-30 MPa (2900-4350 psi). Fatigue data for Al alloys is generally available up to 250-350 C. E.g., 23 MPa for Al 2219 at 350 C, with 120 MHz reverse beam bending stress. See Smithells Metals Reference Book or MIL-HDBK-5J (a 79 MB download from the ASSIST site) for data.

Ken Vlach [deceased]
- Goleta, California

Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.
2003

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