Accession Number:

ADA172705

Title:

An Endochronic Rate-Sensitive Constitutive Equation for Metals. Application to Generalized Creep.

Descriptive Note:

Technical rept. 1 Dec 84-30 Nov 85,

Corporate Author:

CINCINNATI UNIV OH DEPT OF CIVIL AND ENVIONNMENTAL ENGINEERING

Personal Author(s):

• Valanis,K. C.
• Lee,C. F.
• Lee,S. D.

Report Date:

1986-08-01

Pagination or Media Count:

45.0

Abstract:

A constitutive equation is proposed with a view to describing the rate dependent mechanical response of metals at high temperatures. The equation is of the endochronic type and derives its physical foundations from deformation kinetics. Of importance is the fact that hardening is associated with a change in the energy barriers brought about by the inelastic deformation of a metal. The equation is used to describe the results, by Ohno and his associates, of experiments on the creep response of metals to piece-wise constant stress histories. The metal in the present case is 304 stainless steel at 600 C. It is shown that the theory gives analytical results that are in close agreement with experiment. Of consequence is the fact that the constitutive equation applies to three-dimensional stress or strain histories and is thus not limited to those stress histories associated with creep.

Descriptors:

• *STAINLESS STEEL
• *CREEP
• *PHYSICAL METALLURGY
• VISCOPLASTICITY
• STRESS STRAIN RELATIONS
• METALS
• MECHANICAL PROPERTIES
• HIGH TEMPERATURE
• DEFORMATION
• RATES
• SENSITIVITY
• STRAIN RATE
• THREE DIMENSIONAL
• RESPONSE
• SHEAR STRESSES
• KINETICS
• HARDENING

Subject Categories:

• Metallurgy and Metallography
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE