—Purpose of the present study is to predict thermal ratchetting deformation of thin cylindrical shell, in the framework of unified Chaboche visco-plastic constitutive model. Strain controlled cyclic characteristics and uniaxial monotonic loading at different strain rate is analyzed for SS316 L. Thermal ratchet load of 550 ºC is applied cyclically along the axis of the cylinder to predict the deformation pattern accounting strain rate dependence of the material operating at high temperature condition as in Prototype Fast Breeder Reactor (PFBR). The effect of axial temperature variation is simulated by cyclically varying the heat transfer properties at the interacting surfaces of cylindrical shell. To achieve comparable accuracy and better convergence, semi-implicit plasticity integration approach is implemented in UMAT code. Cyclic hardening and strain rate dependence of material is compared by the experimental results.
—Progressive deformation, thermal ratchetting, visco-plastic, chaboche model.
Ashutosh Mishra is with DGFS PhD Fellow in Reactor Design Group at Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, India (e-mail: email@example.com).
Cite:Ashutosh Mishra, R. Suresh Kumar, and P. Chellapandi, "Time Dependent Ratchetting of Thin Cylindrical Shell Due to Axial Temperature Variation Using Visco-Plastic Model," International Journal of Engineering and Technology vol. 6, no. 3, pp. 234-237, 2014.