SN curve
SN curve
(OP)
We have an order for supplying sand castings in Aluminium 319 alloy.Our customer wants to know what is the maximum stress to failure for a 20 million cycle loading?
Data available in the ASM Handbook "Specialty"Aluminium has information only for 5 million cycles/
Request help from some you experts>
Regards,
Nadi.
Data available in the ASM Handbook "Specialty"Aluminium has information only for 5 million cycles/
Request help from some you experts>
Regards,
Nadi.





RE: SN curve
RE: SN curve
Nick
I love materials science!
RE: SN curve
Yes, this does conflict with the generally accepted notion that aluminum alloys do not exhibit an endurance limit. The authors discussed this in the above-mentioned paper, and one idea that was discussed is that the endurance limit may only appear after 107 or 108 cycles for cast alloys, and maybe only after 1011 or greater cycles for wrought alloys. There is a lot of activity in this area with respect to fatigue crack initiation, critical flaw size, etc. One of the key aspects of this research is the use of ultrasonic testing equipment which makes it possible to test to very high cycles. All of their samples were tested in less than 1 month, whereas testing on a single servohydraulic test frame would have required 24.7 years!
Another contemporary paper on this topic is "Microstructure-based fatigue modeling of cast A356-T6 alloy" by D. L. McDowell, et al. It appeared in Engineering Fracture Mechanics 70 (2003) 49-80. Elsevier is still offering a complementary copy of this issue for viewing on their website. Use the following link for the article:
http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6V2R-45FSRWV-1-BM&_cdi=5709&_orig=browse&_coverDate=01%2F31%2F2003&_sk=999299998&view=c&wchp=dGLbVlz-lSzBk&_acct=C000050221&_version=1&_userid=10&md5=9db3c1ee11251782c11017325f3b0c2f&ie=f.pdf
RE: SN curve
nick
RE: SN curve
RE: SN curve
nick
RE: SN curve