Evaluation of Sensitivity and Calibration of the Chaboche Kinematic Hardening Model Parameters for Numerical Ratcheting Simulation

Abstract

Ratcheting failure of materials and structures subjected to low cycle fatigue in the presence of significant mean stress is of great interest to researchers. In this experimental and numerical study, the response of 316L stainless steel samples was observed in symmetric strain control uniaxial test followed by post-stabilized monotonic test, uniaxial and biaxial ratcheting tests, in order to determine the Chaboche model parameters and to evaluate ratcheting prediction using finite element analysis. The critical elastic limit was initially obtained from incremental uniaxial cyclic tests. The Chaboche parameters were subsequently extracted from experimental hysteresis and post-stabilized monotonic stress plastic-strain curves using two optimization technics, namely, the Particle Swarm Optimization (PSO) and Genetic Algorithm (GA). The two optimization methods were compared for efficiency, in terms of time and accuracy. The PSO method presented higher efficient results and was subsequently used to derive the parameters from hysteresis and post-stabilized monotonic curves. Different values (by definition) of elastic limit were also used. The Finite Element commercial software ANSYS was utilized with the Chaboche model to predict the uniaxial and biaxial ratcheting behavior of 316L stainless steel pipe. The comparison between experimental and the numerical simulation demonstrates that adopting post-stabilized monotonic curve rather than hysteresis curve and with accurate elastic limit obtained from incremental loading test improves ratcheting prediction significantly.

Ratcheting Simulation of a Steel Pipe with Assembly Parts under Internal Pressure and a Cyclic Bending Load

“…The valley and peak values were the transition points between the two control modes. (5) The clearance between the sleeve and the pipe had a different effect on the ratcheting response at positions near the sleeve, such as Position 1 and Position 2, and far away from the sleeve, such as Position 3. Near the sleeve, the ratcheting response increased with an increase of the clearance, whereas it decreased with an increase of the clearance when distant from the sleeve (where the bending moment decreased).…”

“…Steel pipes are widely used in machinery and the marine industry, among other fields [1][2][3][4]. They are subjected to internal pressure and a large cyclic bending load, which may incur a ratcheting effect [5]. The ratcheting effect leads to additional plastic damage [6] and has a great influence on the fatigue performance of the structure [7].…”

Combined hardening parameters of high strength steel under low cycle fatigue

“…Stabilized cycles utilize the last cycles that formed throughout the cyclic loading. Lastly, the parameters option can be used after material parameter identification by various methods such as trial & error, curve fitting using ABAQUS (2014) Analysis User's Manual 2014) and algorithm method used by Moslemi et al (2019).…”

Chaboche Model for Fatigue by Ratcheting Phenomena of Austenitic Stainless Steel under Biaxial Sinusoidal Loading

“…In order to predict the cyclic behavior of 316L steel pipe under biaxial cyclic loading performed by Moslemi et al [41], using the finite element calculation code ANSYS (Figure 4-a). The Chaboche model has been exploited for its ability to correctly simulate the different plastic deformation curves obtained as a function of the number of cycles, and compared with the experimental test (Figure 4-b) uniaxial ratcheting with non-zero mean stress occupied a key place, in this study shown by the evolution hysteresis loops (Figure 4-c).…”