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Steel and Composite Structures   Volume 28, Number 1, July10 2018, pages 1-11
DOI: http://dx.doi.org/10.12989/scs.2018.28.1.001
 
Local ratcheting behavior in notched 1045 steel plates
K. Kolasangiani, K. Farhangdoost, M. Shariati and A. Varvani-Farahani

 
Abstract     [Full Text]
    In this paper, local ratcheting behavior of 1045 steel plates with circular cutout was investigated. Experimental tests were carried out by a Zwick/Roell HB 100 servo hydraulic machine. In order to measure the local strain at notch root, a data acquisition system with strain gauge was used. Various notch diameters and distances of strain gauges mounted from the notch root were found influential in the magnitude of local ratcheting strain. It was found that the local maximum principal stress plays a crucial role in increasing the local plastic deformation. Numerical simulation was done by ABAQUS software using nonlinear isotropic/kinematic hardening model. Material parameters of hardening model were attained from several stabilized cycles of flat specimens subjected to symmetric strain cycles. The nonlinear kinematic hardening model along with the Neuber's rule was employed to assess local ratcheting at the notch root of steel plates. The results of the numerical simulations agreed closely with those measured values in this study. Both ratcheting progress and mean stress relaxation occurred simultaneously at the notch root.
 
Key Words
    local ratcheting behavior; notch root; nonlinear isotropic/kinematic hardening model; Neuber's rule; 1045 steel plates
 
Address
(1) K. Kolasangiani, K. Farhangdoost, M. Shariati:
Department of Mechanical Engineering, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran;
(2) A. Varvani-Farahani:
Department of Mechanical and Industrial Engineering, Ryerson University, Victoria Street, Toronto, Canada.
 

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