Fatigue data for cast aluminum alloy 2

[ThiloT]

Hello,

can somebody recommend a source of decent fatigue data (Woehler-chart) for cast aluminum (I need it particularly for Al Si10 Mg). It should go up to at least 1...5*10^7 cycles. Thanks in advance!

 

[TVP]

There are not many sources of information on fatigue strength of Al casting alloys, and certainly none I would call thorough or extensive. Alloys used for aerospace applications (201, 356, 357) are covered in MIL-HDBK-5, Structural Alloys Handbook and Aerospace Structural Metals Handbook. MIL-HDBK-5 is available from the US govt or from Granta and the other two are available from CINDAS. Use the following links for more information:

http://assist2.daps.dla.mil/quicksearch/

http://www.grantadesign.com/cgi-bin/stat-tree.cgi?src=MIL5-H.xml&br=0

https://engineering.purdue.edu/IIES/CINDAS/Pubs_html

Obtaining anything other than generic data on industrial alloys like 360 (equivalent to Al Si10Mg) is difficult. The die casting organizations (NADCA, etc.) and ASM Handbook Volume 2 provide fatigue strength data from rotating bending tests (R.R. Moore tests) usually at 5 x 10[sup]8[/sup] cycles: for this alloy the data is 124-131 MPa. An S-N curve that I obtained from Lanxide (aluminum composites) shows A360 (lower impurity levels) maximum stress levels at 10[sup7[/sup] cycles of ~ 60-70 MPa under R=-1 conditions (fully reveresed). This data is more indicative of properties that can be obtained from production high pressure die castings, which will contain defects that suppress the fatigue life (entrapped gas porosity, filling defects, entrapped lubricant, etc.). The ASM data is best case, and therefore not conservative.

You may be able to find additional data by performing a review of published journals, technical papers, etc. The SAE Technical Paper series would be a good place to start, as well the research literature databases (Cambridge Scientific Abstracts, etc.). Use the following links for more information:

http://www.sae.org

http://www.scirus.net

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http://www.csa.com

 

[ThiloT]

Thank you very much for your excellent and very helpful answer!