Evaluation of inelastic constitutive models for nonlinear structural analysis

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6521042

Kaufman, A

The influence of inelastic material models on computed stress-strain states, and therefore predicted lives, was studied for thermomechanically loaded structures. Nonlinear structural analyses were performed on a fatigue specimen which had been subjected to thermal cycling in fluidized beds and on a mechanically load cycled benchmark notch specimen. Four incremental plasticity creep models (isotropic, kinematic, combined isotropic kinematic, combined plus transient creep) were exercised using the MARC program. Of the plasticity models, kinematic hardening gave results most consistent with experimental observations. Life predictions using the computed strain histories at the critical location with a strainrange partitioning approach considerably overpredicted the crack initiation life of the thermal fatigue specimen.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 6521042
• Report Number(s): NASA-TM-82845; E-1215
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
COMBUSTORS
COMPUTER CODES
CREEP
ENGINES
FABRICATION
FATIGUE
FLUIDIZED-BED COMBUSTORS
GAS TURBINE ENGINES
HEAT ENGINES
HEAT TREATMENTS
INTERNAL COMBUSTION ENGINES
M CODES
MATERIALS WORKING
MECHANICAL PROPERTIES
NONLINEAR PROBLEMS
SERVICE LIFE
STRESS ANALYSIS
STRUCTURAL MODELS
THERMAL CYCLING
THERMAL FATIGUE
THERMOMECHANICAL TREATMENTS