Numerical Simulation of Thermal Ageing Effect on Fracture Behavior for CF8A Cast Stainless Steels under Very Low Cyclic Loading Conditions

Gyo Geun Youn, Hyun Suk Nam, Yun-Jae Kim, Jin Won Kim

Research output: Contribution to journalConference article

Abstract

In this paper, a method to predict the fracture toughness of thermally-aged CF8A under cyclic loading condition is proposed. The FE damage model based on multi-axial fracture strain energy is applied for the prediction. The predicted results are compared with the experimental data of C(T) specimens. The multi-axial fracture strain energy of unaged CF8A can be obtained from tensile and C(T) data under monotonic loading condition. Then, the multi-axial fracture strain energy of aged CF8A can be determined by introducing the concept of thermal ageing constant "C". From the determined multi-axial fracture strain energy of aged CF8A, the fracture toughness of aged CF8A is predicted under monotonic and cyclic loading condition. The predicted results show good agreement with experimental data.

Original languageEnglish
Pages (from-to)1297-1304
Number of pages8
JournalProcedia Structural Integrity
Volume13
DOIs
Publication statusPublished - 2018 Jan 1
Event22nd European Conference on Fracture, ECF 2018 - Belgrade, Serbia
Duration: 2018 Aug 252018 Aug 26

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Thermal aging
Stainless Steel
Strain energy
Stainless steel
Computer simulation
Fracture toughness

Keywords

  • C(T) test
  • Finite element method
  • Fracture toughness
  • Low cycle fatigue
  • Multi-axial fracture strain energy
  • Themal ageing constant

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Materials Science(all)

Cite this

Numerical Simulation of Thermal Ageing Effect on Fracture Behavior for CF8A Cast Stainless Steels under Very Low Cyclic Loading Conditions. / Youn, Gyo Geun; Nam, Hyun Suk; Kim, Yun-Jae; Kim, Jin Won.

In: Procedia Structural Integrity, Vol. 13, 01.01.2018, p. 1297-1304.

Research output: Contribution to journalConference article

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AU - Kim, Jin Won

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N2 - In this paper, a method to predict the fracture toughness of thermally-aged CF8A under cyclic loading condition is proposed. The FE damage model based on multi-axial fracture strain energy is applied for the prediction. The predicted results are compared with the experimental data of C(T) specimens. The multi-axial fracture strain energy of unaged CF8A can be obtained from tensile and C(T) data under monotonic loading condition. Then, the multi-axial fracture strain energy of aged CF8A can be determined by introducing the concept of thermal ageing constant "C". From the determined multi-axial fracture strain energy of aged CF8A, the fracture toughness of aged CF8A is predicted under monotonic and cyclic loading condition. The predicted results show good agreement with experimental data.

AB - In this paper, a method to predict the fracture toughness of thermally-aged CF8A under cyclic loading condition is proposed. The FE damage model based on multi-axial fracture strain energy is applied for the prediction. The predicted results are compared with the experimental data of C(T) specimens. The multi-axial fracture strain energy of unaged CF8A can be obtained from tensile and C(T) data under monotonic loading condition. Then, the multi-axial fracture strain energy of aged CF8A can be determined by introducing the concept of thermal ageing constant "C". From the determined multi-axial fracture strain energy of aged CF8A, the fracture toughness of aged CF8A is predicted under monotonic and cyclic loading condition. The predicted results show good agreement with experimental data.

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