Letter 26097

Automotive designer needs S-N curve for AlMg3 [Germany] 

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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

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 - Goleta, California

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