Is it possible to perform tension-compression fatigue test on very thin metallic samples? Can anyone suggest a paper/thesis?
thanks
For metallic sheet tension fatigue calculation can be calculated by using stress range between two loading conditions of your cycle and S-N curves of your material but for compression your metal sheet will probably experience buckling then what is the full scope of your study?
Thanks Abdelaziz Benmerkhi, I need the plasticity curve to feed simulation that's why I need tension-compression and not only tension-tension. We calculated the stress level to avoid buckling. Trying to see if there is anything done in the past and what were the challenges.
Hi Zohreh, the closest test fixture I can think of was one that I have used was for compression testing of sheet samples (see link below). It is not connected directly to an accepted ASTM test method but it at least has some precedent. Good Luck!! - Eric.
https://wyomingtestfixtures.com/products/compression/modified-astm-d-695-compression-test-fixture-boeing-bss-7260/
Hello Zohreh,
Buckling for a sheet metal < 1mm seem to me almost non avoidable unless you use a stiffener or your final application is a pressure equipment and in that case the internal pressure will participate to the stability (like balloon).
Generally simulation software will use a pretension load case to feed the buckling simulation which is mainly based on eigenvalue calculation for linear buckling.
But if you want to see the non linear buckling itself you need a time history analysis using explicit dynamic with LSDYNA for high speed deformation like crash for example or ANSYS but you need.
I advise you to use volume modeling for accurate result for sample, but the size and shape of the sample impact the buckling behavior of your structure, than for Isotropic materiel you can use :
ISO 527-1 & ISO 527-2 standard for dimension and shape.
Best regards
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