소성∙가공 (Transactions of Materials Processing)

  • 제4권2호
  • /
  • Pages.131-140
  • /
  • 1995
  • /
  • 1225-696X(pISSN)
  • /
  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
권호 표지

항공기 재료 성형시의 손상진전에 관한 연구

A Study on the Damage Propagation of an Aircraft Material During Forming

  • 김위대 (부산대학교 항공우주공학과, 기계기술연구소) ;
  • 김진희 (서울대학교 항공우주공학과) ;
  • 김승조 (서울대학교 항공우주공학과)
  • 발행 : 1995.06.01
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초록

In this paper damage propagation of a material during forming is investigated with the concept of continuum damage mechanics. An isotropic damage model based on the theory of materials of type N is adopted to describe the damage process of a ductile material with large elasto-viscoplastic deformation. The stiffness degradation of the loaded material is chosen as a damage measure. The highly nonlinear equilibrium equations are reduced to the incremental weak form and approximated by the total Lagrangian finite element method. To simulate contact condition, extended interior penalty method with modified coulomb friction law is adopted. The displacement control method along with the modified Riks' continuation technique is used to solve the incremental iterative equations. As numerical examples, upsetting problem and backward extrusion problem are simulated and the results of damage propagation and $J_2$ stress contours with and without friction are presented.

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참고문헌

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