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New distortional yield surface model: Application in cyclic uniaxial and multiaxial loading: Rokhgire, Nayebi*, Chaboche
This paper is concerned with the ratcheting prediction for steels. The yield surface evolution is integratedin the elastoplasticity analysis by a new proposed model. First, the new proposed model of DistortionalYield Surface (DYS) is developed and then ratcheting under different uniaxial and multiaxial cyclicloadings is investigated. The capabilities of the DYS model is assessed by using the results of variousstress-controlled and strain-controlled tests under uniaxial loading condition and the cyclic uniaxial experimentalresults of Hassan and Kyriakides (1994a). In addition, the model prediction under multi-stepsuniaxial loadings is also studied. Effects of DYS consideration in different uniaxial loadings are shown.Strain or stress controlled tests and combined stress-strain control experimental tests (Hassan and Kyriakides,1994b) are used to be modeled by the present distortional yield surface approach. The biaxialexperiments on CS 1018 thin-walled tubes (Hassan and Kyriakides, 1994b) are chosen to be comparedwith the present model results. With the incorporation of DYS, The new proposed model shows betterprediction of uniaxial and multiaxial ratchetting in all ranges of experimentally tested parameters.
Keywords:
Ratcheting
Cyclic plasticity
Distortional yield surface
Constitutive modeling
Int. J. of Solids and Structures, 2017, In press
http://dx.doi.org/10.1016/j.ijsolstr.2017.01.026
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could you model ratchetting also for millions of cycles?
I have had some limited interest in ratchetting as it came from Ken Johnson interest in railways rolling contact fatigue. I gave up in this area because think the trouble is fatigue occurs over millions of cycles, and repetitive plastic deformation, although clearly occurring under high hydrostatic compression, are extremely sensitive to details. Johnson had a number of phd students working on this from the 1960's until the 1980's, Merwin was probably the first (and I think they made quite erroneous account of plastic deformation, see my paper below), and Allan Bower was probably the last. What do you think of this area? Can your model be applied to RCF?
Afferrante, L., Ciavarella, M., & Demelio, G. (2004). A re-examination of rolling contact fatigue experiments by Clayton and Su with suggestions for surface durability calculations. Wear, 256(3), 329-334.
Ponter, A. R. S., L. Afferrante, and M. Ciavarella. "A note on Merwin’s measurements of forward flow in rolling contact." Wear 256, no. 3 (2004): 321-328.