Ratcheting Analysis
SIMULATION OF RATCHETING BEHAVIOR BY FINITE ELEMENT METHOD
M.Tech. Dissertation
Submitted in partial fulfillment of the requirements for the award of the degree of Master of Technology by
Ajit Gajanan Dongarkar Roll No. 00310601 under the guidance of
Prof. P. Vasudevan and Prof. Amitava De
Department of Mechanical Engineering Indian Institute of Technology Bombay.
January 2003
1
Dissertation Approval Sheet
This is to certify that the dissertation entitled “Simulation of Ratcheting Behavior by Finite Element Method” by Ajit Gajanan Dongarkar is approved for the degree of “Master of Technology”.
Guide
Co-Guide
________________________
________________________
Internal Examiner
External Examiner
________________________
_________________________
Chairman
Date:
_______________________
2
Abstract
Ratcheting is defined as the accumulation of plastic strain with progressive load cycles. It is well known that ratcheting can reduce fatigue life or cause failure of piping components or pressure vessel systems subjected to seismic or other cyclic loads. For design and analysis of these types of structures, accurate prediction of ratcheting response is critical as ratcheting can lead to catastrophic failure of the structures. The evaluation of such structures can be undertaken by experimental or step-by-step numerical approaches. The later approach includes the state of the art constitutive material models which can simulate the ratcheting behavior for various geometries and loading histories. Several constitutive models to the description of cyclic plasticity or ratcheting behavior have been published in recent years. Experimentation is carried out on SS 304 tube specimens under uniaxial and biaxial set of loadings. The material parameters of the nonlinear Chaboche model are determined with the data obtained from experimentation. These parameters are then used in the commercial finite element program ‘ANSYS
M.Tech. Dissertation
Submitted in partial fulfillment of the requirements for the award of the degree of Master of Technology by
Ajit Gajanan Dongarkar Roll No. 00310601 under the guidance of
Prof. P. Vasudevan and Prof. Amitava De
Department of Mechanical Engineering Indian Institute of Technology Bombay.
January 2003
1
Dissertation Approval Sheet
This is to certify that the dissertation entitled “Simulation of Ratcheting Behavior by Finite Element Method” by Ajit Gajanan Dongarkar is approved for the degree of “Master of Technology”.
Guide
Co-Guide
________________________
________________________
Internal Examiner
External Examiner
________________________
_________________________
Chairman
Date:
_______________________
2
Abstract
Ratcheting is defined as the accumulation of plastic strain with progressive load cycles. It is well known that ratcheting can reduce fatigue life or cause failure of piping components or pressure vessel systems subjected to seismic or other cyclic loads. For design and analysis of these types of structures, accurate prediction of ratcheting response is critical as ratcheting can lead to catastrophic failure of the structures. The evaluation of such structures can be undertaken by experimental or step-by-step numerical approaches. The later approach includes the state of the art constitutive material models which can simulate the ratcheting behavior for various geometries and loading histories. Several constitutive models to the description of cyclic plasticity or ratcheting behavior have been published in recent years. Experimentation is carried out on SS 304 tube specimens under uniaxial and biaxial set of loadings. The material parameters of the nonlinear Chaboche model are determined with the data obtained from experimentation. These parameters are then used in the commercial finite element program ‘ANSYS
References: Analysis, Vol. 20, pp.7-14, 1985. 2) Hassan T., Corona E. and Kyriakides S., “On the Performance of Kinematic Hardening Rules in Predicting a Class of Biaxial Ratcheting Histories”, International Journal of Plasticity, Vol. 12, No. 1, pp. 117-154, 1996. 3) Ohno N., Abdel-Karim M., Mima Y., Mizuno M., “Uniaxial Ratcheting of 316FR Steel at Room Temperature-Part I: Experiments”, ASME Journal of Engineering Material and Technology, Vol.122, pp.29-34, 2000. 4) Hassan T. and Kyriakides S., "Ratcheting in Cyclically Hardening and Softening Materials; Part I Uniaxial Behavior”, International Journal of Plasticity, Vol.10, pp.149-184, 1994. 5) Hassan T. and Zhu Y. and Matzen V.C., "Improved Ratcheting Analysis of piping components”, International Journal of Pressure Vessels and Piping, Vol.75, pp.643-652, 1998. 6) Hubel H., “Basic Conditions for Material and Structural Ratcheting”, Nuclear Engineering and Design, Vol.162, pp. 55-65,1996. ASME Boiler and Pressure Vessel Code, Section III, Division I, Subsection NB, Rules for Construction of Nuclear Power Plant Components, Class 1 Components, The American Society of Mechanical Engineers, 1989. Dynamic Recovery, Part I: Formulations and Basic Features for Ratcheting behavior”, International Journal of Plasticity, Vol. 9, pp.375-390, 1993. Ratcheting Simulation”, International Journal of Plasticity, Vol. 16, pp. 381- 409, 2000. Fatigue Analysis”, Prentice Hall, Englewood Cliffs, New Jersey 07632, 1990. pp. 873-894, 2002. Multiaxial Ratcheting Simulation”, International Journal of Plasticity, Vol. 17, pp.885-905, 2001. 11, pp. 1073-1100, 1985. Dynamic Recovery, Part II: Applications to Experiments of Ratcheting Behavior”, International Journal of Plasticity, Vol. 9, pp.375-390, 1993. Ratcheting with Steady State”, International Journal of Plasticity, Vol. 16, pp.225-240, 2000 Temperature-Part II: Constitutive Modeling and Simulation”, ASME Journal of Engineering Material and Technology, Vol.122, pp.35-41, 2000.