An evolutionary yield function based on Barlat 2000 yield function for the superconducting niobium sheet

Journal Article · Mon Aug 22 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3623613· OSTI ID:21611542

Darbandi, Payam; Pourboghrat, Farhang ^[1]

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1. Mechanical Engineering Department, Michigan State University, East Lansing, MI 48824 (United States)

Superconducting radio frequency (SRF) niobium cavities are widely used in high-energy physics to accelerate particle beams in particle accelerators. The performance of SRF cavities is affected by the microstructure and purity of the niobium sheet, surface quality, geometry, etc. Following optimum strain paths in the forming of these cavities can significantly control these parameters. To select these strain paths, however, information about the mechanical behavior, microstructure, and formability of the niobium sheet is required. In this study the Barlat 2000 yield function has been used as a yield function for high purity niobium. Results from this study showed that, due to intrinsic behavior, it is necessary to evolve the anisotropic coefficients of Barlat's yield function in order to properly model the plastic behavior of the niobium sheet. The accuracy of the newly developed evolutionary yield function was verified by applying it to the modeling of the hydrostatic bulging of the niobium sheet. Also, in a separate attempt crystal plasticity finite element method was use to model the behavior of the polycrystalline niobium sheet with a particular initial texture.

• OSTI ID: 21611542
• Journal Information: AIP Conference Proceedings, Vol. 1383, Issue 1; Conference: NUMISHEET 2011: 8. international conference and workshop on numerical simulation of 3D sheet metal forming processes, Seoul (Korea, Republic of), 21-26 Aug 2011; Other Information: DOI: 10.1063/1.3623613; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
FINITE ELEMENT METHOD
IMPURITIES
MICROSTRUCTURE
NIOBIUM
PLASTICITY
POLYCRYSTALS
RADIOWAVE RADIATION
RF SYSTEMS
SHEETS
STRAINS
SUPERCONDUCTING CAVITY RESONATORS
SURFACES
TEXTURE
YIELD STRENGTH
CALCULATION METHODS
CAVITY RESONATORS
CRYSTALS
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
MATHEMATICAL SOLUTIONS
MECHANICAL PROPERTIES
METALS
NUMERICAL SOLUTION
RADIATIONS
REFRACTORY METALS
RESONATORS
SUPERCONDUCTING DEVICES
TRANSITION ELEMENTS