국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Behavior of Three Metallic Alloys Under Combined Axial-Shear Stress at 650 캜
저자	Jason F. Colaiuta
Keyword	Inconel 718; Haynes 188; Stainless steel; Yield surfaces;Multiaxial stress; Inelasticity; Viscoplasticity; Strength differential
URL	http://gltrs.grc.nasa.gov/reports/2001/CR-2001-211162.pdf
보고서번호	NASA CR-2001-211162
발행년도	2001
출처	NASA Glenn Research Center
ABSTRACT	Three materials, Inconel 718, Haynes 188, and 316 stainless steel, were tested under an axial-torsional stress state at 650 캜. The objective of this study was to quantify the evolution of the material while in the viscoplastic domain. Initial and subsequent yield surfaces were experimentally determined to quantify hardening. Subsequent yield surfaces (yield surfaces taken after a preload) had a well-defined front side, in the prestrain direction, but a poorly defined back side, opposite the prestrain direction. Subsequent yield surfaces exhibited isotropic hardening by expansion of the yield surface, kinematic hardening by translation of the yield surface, and distortional hardening by flattening of the yield surface in the direction opposite to the last prestrain. An existing yield function capable of representing isotropic, kinematic, and distortional hardening was used to fit each yield surface. Four variables are used to describe each surface. These variables evolve as the material state changes and have been regressed to the yield surface data.