SIMULATION OF RATCHETING BEHAVIOR BY EXPERIMENTAL AND FINITE ELEMENT
Keywords:
Fatigue, Ratcheting, Cyclic plasticity, Von Mises Criteria, SS304, Stress-Strain Curve, Hysteresis Loop, ANSYS, Hardening, StabilizationAbstract
Ratcheting is a phenomenon in cyclic plasticity. It is defined as the accumulation of plastic strain with progressive load cycles. It is well known that ratcheting can reduce the fatigue life of the components subjected to cyclic load environment such as pressure vessel systems. For design and analysis of these types of structures, accurate prediction of ratcheting response is critical as ratcheting can lead to catastrophic failure of structures. Experimentation is carried out on SS304 tube specimens under uniaxial and biaxial set of loadings. The specimens are subjected to constant internal pressure and axially cyclic loading is applied using Universal Testing Machine. The strain data in axial and hoop directions is measured using strain gauges. The material parameters of the nonlinear Chaboche Model are determined with the data obtained from the experimentation. These material parameters are used in the commercial finite element program “ANSYS” to simulate the ratcheting behavior for different load histories and geometries. Comparison is made between experimental and FEM results to analyze the robustness of the Chaboche Model used in the simulation studies.
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References
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