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Title: Factors affecting plastic instability and sheet formability

Factors affecting plastic instability and sheet formability The strong influence of geometry and materials properties on plastic instability and sheet formability is illustrated with several experimental observations. Geometry (shape) of the specimen or work piece and the evolution of shape with deformation is of great importance. Experiments on sheet and thin-walled tubes have demonstrated convincingly that sheets stretched over a punch are more stable than sheets stretched in-plane; which, in turn, are more stable than expanded thin-walled tubes. All can be explained by the specific interaction of specimen shape with loads and deformations. The materials parameters of greatest importance (Hecker, 1978a) are strain hardening, strain-rate sensitivity, and plastic anisotropy. Several experiments are cited that demonstrate the importance of stress state, large strains, and path changes on the strain-hardening response and on subsequent stability.
Authors:
Publication Date:
OSTI Identifier:6100207
Report Number(s):LA-UR-83-1174; CONF-830832-1
ON: DE83011146
DOE Contract Number:W-7405-ENG-36
Resource Type:Conference
Data Type:
Resource Relation:Conference: 4. international conference on mechanical behavior of materials, Stockholm, Sweden, 15 Aug 1983
Research Org:Los Alamos National Lab., NM (USA)
Country of Publication:United States
Language:English
Subject: 36 MATERIALS SCIENCE; SHEETS; DEFORMATION; MATERIALS WORKING; PLASTICITY; SHAPE; STABILITY; STRAIN HARDENING; STRAIN RATE; FABRICATION; HARDENING; MECHANICAL PROPERTIES 360101* -- Metals & Alloys-- Preparation & Fabrication