Determination of multiaxial flow surfaces at elevated temperatures using the concept of dissipation potential

Technical Report · Fri Apr 01 04:00:00 EST 1988

OSTI ID:5098192

Clinard, J A; Lacombe, C

This analytical activity builds on previous experimental efforts at Oak Ridge National Laboratory to measure multiaxial flow surfaces using tubular specimens of type 316 stainless steel. Tests were isothermal at 650/degree/C (1200/degree/F). Flow surface determination was conducted after certain torsional preloadings and was composed of a series of 16 probes at 16 distinct axial/torsional stress-rate ratios. These probes sufficiently characterized the flow surfaces in the stress subspace. Previous analytical efforts reduced the experimental data for determination of surfaces of constant inelastic strain rate (SCISR). Current efforts remove assumptions concerning the inelastic strain state (for the multiaxial response) and reuse the experimental data to cast flow surfaces in the form of surfaces of constant dissipation potential (SCDP). Some 43 SCDP flow surface families are determined from the high-temperature experimental database. Details of the analytical techniques are provided. Resulting preliminary assessments are presented and discussed concerning various theoretical subjects such as normality of strain rate vectors and goodness-of-fit of candidate stress functions composed of second and third stress invariants. 8 refs., 48 figs.

• Research Organization: Oak Ridge National Lab., TN (USA); Tennessee Univ., Knoxville (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5098192
• Report Number(s): ORNL/TM-10787; ON: DE88009443
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CREEP
DATA
DATA ANALYSIS
DATA COMPILATION
DISSIPATION FACTOR
FLOW MODELS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
SHEAR
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
STRESSES
SURFACES
TESTING