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Cast iron in ABAQUS
- Thread starter mattis
- Start date
Hi!
While Abaqus does have some specific fracture-related features for grey iron, it may be enough to just input the stress-strain curves point-by-point; authors such as Angus and Roark regard the material as non-linear past about 25% UTS and some tests I've carried out confirm this (others with different strain-gauges are ongoing). As with many "awkward" materials, I guess it depends what data you've got and whether you're doing cyclic loading or just monotonic. There's some good stuff on this in a PhD thesis by Downing (all authors should be pretty easy to Google!).
It may be worth just doing a couple of load points elastically first to see which bits are in tension/compression (ie how much it matters!) and considering how conservative you want/have to be (eg is treating it all as elastic OK if you assume a low elastic modulus ie very stiff?)...
Good luck!
While Abaqus does have some specific fracture-related features for grey iron, it may be enough to just input the stress-strain curves point-by-point; authors such as Angus and Roark regard the material as non-linear past about 25% UTS and some tests I've carried out confirm this (others with different strain-gauges are ongoing). As with many "awkward" materials, I guess it depends what data you've got and whether you're doing cyclic loading or just monotonic. There's some good stuff on this in a PhD thesis by Downing (all authors should be pretty easy to Google!).
It may be worth just doing a couple of load points elastically first to see which bits are in tension/compression (ie how much it matters!) and considering how conservative you want/have to be (eg is treating it all as elastic OK if you assume a low elastic modulus ie very stiff?)...
Good luck!
- Thread starter
- #3
Thanks for replying MToft. After thinking about my problem for a while I´ve found that I don´t need to model this behaviour at the moment. As usual if you let a few days pass you´ll cool down and go back to reality....
My experience based on my companys data from grey Iron (tons and tons of data) is that it isn´t linear at all. 25% of uts as linear is probably a good approximation though.
Good to hear opinons from someone else so thanks again for your answer.
My experience based on my companys data from grey Iron (tons and tons of data) is that it isn´t linear at all. 25% of uts as linear is probably a good approximation though.
Good to hear opinons from someone else so thanks again for your answer.
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