Numerical and Experimental Study on Ratcheting Behavior of Plates with Circular Cutouts under Cyclic Axial Loading

Document Type: Research Paper

Authors

1 Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

2 Department of Mechanicaland and Industrial Engineering, Ryerson University, Toronto, Canada

Abstract

In this paper, accumulation of plastic deformation of AISI 1045 steel plates with circular cutouts under cyclic axial loading is studied. Loading was applied under force-control conditions. Experimental tests were performed using a Zwick/Roell servo hydraulic machine. Under force-control loading with nonzero mean force, plastic strain was accumulated in continuous cycles called ratcheting. Numerical analysis was carried out by ABAQUS software using nonlinear isotropic/kinematic hardening model. The results of the numerical simulations were compared to experimental data. The results demonstrated that the ratcheting response of plates with circular cutouts could be numerically simulated with a reasonable accuracy. It was observed that the local and global plastic deformation increase with increasing the notch diameter. Also, maximum principal stress was the main parameter for initiation of crack around the notch. Based on numerical results, at notch root, both ratcheting strain and local mean stress relaxation was occur simultaneously and due to relaxation of local mean stress, plastic shakedown was occurred.

Keywords


[1] Dowling E., 1998, Mechanical Behavior of Materials, Prentice Hall, Fourth Edition.
[2] Koe S., Nakamura H., Tsunenari T., 1978, Fatigue life estimation of notched plates based on elasto-plastic analysis, Journal of the Society of Materials Science 27(300): 847-852.
[3] Sakane M., Ohnami M., 1983, A study of the notch effect on the low cycle fatigue of metals in creep–fatigue interacting conditions at elevated temperatures, Journal of Engineering Materials and Technology 105(2): 75-80.
[4] Sakane M., Ohnami M., 1986, Notch effect in low-cycle fatigue at elevated temperature-life prediction from crack initiation and propagation considerations, Journal of Engineering Materials and Technology 108(4): 279-284.
[5] Fatemi A., Zeng Z., Plaseied A., 2004, Fatigue behavior and life predictions of notched specimens made of QT and forged microalloyed steels, International Journal of Fatigue 26: 663-672.
[6] Varvani-Farahani A., Kodric T., Ghahramani A., 2005, A method of fatigue life prediction in notched and un-notched components, Journal of Material Processing Technology 169: 94-102.
[7] Medekshas H., Balina V., 2006, Assessment of low cycle fatigue strength of notched components, Materials&Design 27: 132-140.
[8] Nozaki M., Zhang S., Sakane M., Kobayashi K., 2011, Notch effect on creep-fatigue life for Sn-3.5Ag solder, Engineering Fracture Mechanics 78: 1794-1807.
[9] Savaidis A., Savaidis G., Zhang Ch., 2001, Elastic-plastic FE analysis of a notched shaft under multiaxial nonproportional synchronous cyclic loading, Theoretical and Applied Fracture Mechanics 36: 87-97.
[10] Wang CH., Rose L.R.F., 1998, Transient and steady-state deformation at notch root under cyclic loading, Mechanics of Materials 30: 229-241.
[11] Shi D.Q., Hu X.A., Wang J.K., Yu H.C., Yang X.G., Huang J., 2013, Effect of notch on fatigue behavior of a directionally solidified superalloy at high temperature, Fatigue & Fracture of Engineering Materials & Structures 36: 1288-1297.
[12] ASTM A370-05, Standard test method and definitions for mechanical testing of steel products.
[13] Chen G., Chen X., Chang-Dong N., 2006, Uniaxialratchetingbehaviorof63Sn37Pb solder with loading histories and stress rates, Material Science and Engineering A 421: 238-244.
[14] Shariati M., Kolasangiani K., Norouzi G., Shahnavaz, A., 2014, Experimental study of SS316L cantilevered cylindrical shells under cyclic bending load, Thin-Walled Structures 82: 124-131.
[15] Gaudin C., Feaugas X., 2004, Cyclic creep process in AISI 316L stainless steel in terms of dislocation patterns and internal stresses, Acta Materials 52: 3097-3110.
[16] ABAQUS 6.10.1 PR11 user’s manual.