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Constraint Assessment for Specimens Tested Under Uniaxial and Biaxial Loading Conditions

[+] Author Affiliations
Yupeng Cao, Yinbiao He

Shanghai Nuclear Engineering Research and Design Institute, Shanghai, China

Guian Qian, Markus Niffenegger

Paul Scherrer Institute, Villigen, Switzerland

Yuh J. Chao

University of South Carolina, Columbia, SC

Paper No. PVP2017-65979, pp. V06AT06A049; 6 pages
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 6A: Materials and Fabrication
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5799-1
  • Copyright © 2017 by ASME


In the integrity analysis of a reactor pressure vessel (RPV), a postulated shallow crack is subjected to biaxial far-field stresses. However, the fracture toughness Kc or Jc, which is an important material property for the integrity assessment of a RPV, are usually tested with deeply-cracked compact tension [C(T)] or single-edged bending [SE(B)] specimens under uniaxial loading. Thus, the fracture toughness data do not reflect the biaxial loading state that the cracks in a RPV are subjected to. Cruciform bending specimen is therefore developed to simulate the biaxial stress state. In this paper, a series of finite element (FE) simulations of the cruciform specimens containing different crack geometries and of different material properties are conducted. The crack tip constraint is investigated using the J-A2 theory and the stress field near the crack tips is analyzed. The results show that the biaxial effect is material property dependent. This can contribute to the lifetime prediction of a RPV as well as better design of cruciform specimens.

Copyright © 2017 by ASME



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