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Application of Energy-Based Damage Model to Simulate Ductile Fracture Under Cyclic Loading and Validation Against Piping System Test Data

[+] Author Affiliations
Gyo-Geun Youn, Hyun-Suk Nam, Hune-Tae Kim, Jong-Min Lee, Yun-Jae Kim

Korea University, Seoul, South Korea

Paper No. PVP2018-84861, pp. V06AT06A019; 8 pages
doi:10.1115/PVP2018-84861
From:
  • ASME 2018 Pressure Vessels and Piping Conference
  • Volume 6A: Materials and Fabrication
  • Prague, Czech Republic, July 15–20, 2018
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5167-8
  • Copyright © 2018 by ASME

abstract

In this paper, a method to predict ductile fracture under low cyclic loading condition is proposed. Then it is compared with test results of surface cracked pipes which is conducted by Battelle Institute. A&F nonlinear kinematic hardening model is adopted to describe material behavior under cyclic loading condition and energy-based damage model is applied to simulate ductile crack growth. The energy-based damaged model is depending on multi-axial fracture strain energy. To apply this model, two parameters should be determined from tensile and C(T) test results under monotonic loading condition. One is multi-axial fracture strain energy Wf and the other is critical damage value ωc. From the determined damaged model, it is enable to simulate surface cracked pipe tests under low cyclic loading condition.

Copyright © 2018 by ASME

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