Accession Number : ADA313313

Title :   Ductile Fracture and Failure Criteria of Structural Steels.

Descriptive Note : Progress rept. 1 Apr 95-31 Mar 96,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEE RING

Personal Author(s) : Koss, D. A.

PDF Url : ADA313313

Report Date : JUN 1996

Pagination or Media Count : 39

Abstract : Progress is reviewed for a program which examines multiaxial failure criteria and the associated mechanisms of ductile fracture in structural steels using HY100 as a model system. Failure limit diagram data are presented for the dependence of failure initiation of HY100 over a range of multiaxial tensile stresses and microstructural conditions including material heat treated to simulate heat-affected zone material in a weldment. An analysis of experimental observations suggests two modes of ductile fracture: failure caused by a global accumulation of damage which is very sensitive to stress triaxiality and failure caused by localized void linking in the form of void-stress instabilities which is only moderately sensitive to stress state. A computational model is presented to describe the void-sheet mode of failure while an experimental model has been devised to explore void interaction effects during global damage accumulation. p3

Descriptors :   *FRACTURE(MECHANICS), *DUCTILITY, *FAILURE(MECHANICS), *STRUCTURAL STEEL, MATHEMATICAL MODELS, MICROSTRUCTURE, COMPUTATIONS, DAMAGE, MODELS, INTERACTIONS, MATERIALS, TENSILE STRESS, SENSITIVITY, VOIDS, WELDMENTS, HEAT, ACCUMULATION.

Subject Categories : Metallurgy and Metallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE