Nuclear power plants are designed to withstand earthquake loads without severe damage under service level D conditions. Under earthquake induced reversing dynamic load, nuclear power plant components may undergo plastic deformation. Plastic deformation in class I nuclear power plant piping systems is limited by Equation (9) of ASME Boiler & Pressure Vessel Code [14], Section III, NB-3652. In the year 2000, the ASME B&PV Code was revised to accommodate reversing dynamic loading in which the failure mode is fatigue ratcheting, instead of plastic collapse. This modified equation [16] contains B2′ index, which is given as a fraction of B2 index where, B2 is defined for monotonic loading [17]. In this study a new definition is proposed for calculating B2′ stress index which is given by B2′ = MCLcyclicRange,straightpipe/MCLcyclicRange,component, where MClcyclicRange is the range of collapse moment. Incremental elastic-plastic nonlinear finite element analyses are performed considering both material and geometric nonlinearities. Kinematic hardening, isotropic hardening and elastic-perfectly plastic material models have been used to model the material behavior during plastic deformation. Load deflection curves are obtained and from these curves collapse loads for monotonic and cyclic loading are determined. B2 and B2′ stress indices are computed for elbows using the proposed equation. The computed stress indices are compared with ASME Code values.
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ASME/JSME 2004 Pressure Vessels and Piping Conference
July 25–29, 2004
San Diego, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4675-X
PROCEEDINGS PAPER
B2' Stress Indices for Elbows Using Non-Linear Finite Element Analysis Available to Purchase
K. Venkataramana,
K. Venkataramana
Bhabha Atomic Research Centre, Mumbai, Maharastra, India
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V. Bhasin,
V. Bhasin
Bhabha Atomic Research Centre, Mumbai, Maharastra, India
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K. K. Vaze,
K. K. Vaze
Bhabha Atomic Research Centre, Mumbai, Maharastra, India
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H. S. Kushwaha
H. S. Kushwaha
Bhabha Atomic Research Centre, Mumbai, Maharastra, India
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K. Venkataramana
Bhabha Atomic Research Centre, Mumbai, Maharastra, India
V. Bhasin
Bhabha Atomic Research Centre, Mumbai, Maharastra, India
K. K. Vaze
Bhabha Atomic Research Centre, Mumbai, Maharastra, India
H. S. Kushwaha
Bhabha Atomic Research Centre, Mumbai, Maharastra, India
Paper No:
PVP2004-2689, pp. 187-194; 8 pages
Published Online:
August 12, 2008
Citation
Venkataramana, K, Bhasin, V, Vaze, KK, & Kushwaha, HS. "B2' Stress Indices for Elbows Using Non-Linear Finite Element Analysis." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Pressure Vessel and Piping Codes and Standards. San Diego, California, USA. July 25–29, 2004. pp. 187-194. ASME. https://doi.org/10.1115/PVP2004-2689
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