1. 제 목 : 과도동적 거동해석을 위한 비선형 연속체역학과 탄소성 구성방정식의 정립





2. 연 사 : 하재선 박사 (대한항공 항공기술연구원, KSLV-1 SI/수석연구원)





3. 일 시 : 2004년 3월 19일 (금) 오후 4:30





4. 장 소 : 301동 1512호 (세미나실)





5. 내 용 : This talk is concerned with applications of the objective stress rates of the Kirchhoff or Cauchy stress to a unified stress update algorithm for transient shell dynamic analysis within the context of explicit time integration. The Eulerian rate constitutive equations of hypo elasto-plastic materials are based on the additive decomposition of the rate of decomposition tensor and the assumption that its elastic part is characterized to be hypoelastic with grade zero, i.e., the fourth-rank constant isotropic tensor. Several objective stress rates are derived through the Lie derivative of the Kirchhoff or Cauchy stress tensor. Those stress rates cover, for instance, the Jaumann, Green-Naghdi, Truesdell, Oldroyd, Cotter-Rivlin stress rates. Further a unified stress update algorithm of those stress rates, based on the radial return method and the phenomenological plasticity theory with combined isotropic and kinematic hardenings, is presented, and their results are respectively compared through some transient shell dynamics examples. In the implementation of the unified stress update algorithm, the Belytschko-Lin-Tsay shell theory is employed. Several numerical examples are demonstrated including non-contact transient shell dynamics examples and pipe whip problems along with the master-slave slideline contact search algorithm, by which proposed algorithms are compared with respect to the accuracy and effectiveness.





6. 약 력 :


Ph.D. : Georgia Institute of Technology, Dept. of Mechanical Engineering, 1992-1998


M.S. : KAIST, Dept. of Mechanical Engineering, 1985-1987


B.S. : Seoul Nat’l University, Dept. of Naval Architecture Engineering, 1981-1985


1987 - Current : 대한항공 항공기술연구원





KTX-1 AFT Fuselage Structural Analysis, 1989-1992


MD-11 Composite Spoiler Analysis, 1991


KTX-2 AFT Fuselage Structural Analysis, 1998-2000


KTX-2 AFT Fuselage Test/Evaluation, 2000-2001


KOMPSAT II Composite Platform Analysis, 2001


제3회 전산구조 소프트웨어 경진대회 대상 과학기술부 장관상 수상, 2003


KSLV-1 Coupled Load Analysis, Current





7. 문 의 : 기계항공공학부 조맹효 교수 (☏ 880-1645)


서울대 BK21 기계분야사업단 행정실 (☏ 880-7132)





8. 기계분야 박사과정 세미나 수업 수강생 여러분들은 필히 참석해 주시고, 기타 관심 있는 분들의


많은 참여를 부탁 드립니다.