Materials constitutive models for nonlinear analysis of thermally cycled structures

Technical Report · Fri Oct 01 04:00:00 EDT 1982

OSTI ID:5933117

Kaufman, A; Hunt, L E

Effects of inelastic materials models on computed stress-strain solutions for thermally loaded structures were studied by performing nonlinear (elastoplastic creep) and elastic structural analyses on a prismatic, double edge wedge specimen of IN 100 alloy that was subjected to thermal cycling in fluidized beds. Four incremental plasticity creep models (isotropic, kinematic, combined isotropic kinematic, and combined plus transient creep) were exercised for the problem by using the MARC nonlinear, finite element computer program. Maximum total strain ranges computed from the elastic and nonlinear analyses agreed within 5 percent. Mean cyclic stresses, inelastic strain ranges, and inelastic work were significantly affected by the choice of inelastic constitutive model. The computing time per cycle for the nonlinear analyses was more than five times that required for the elastic analysis.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 5933117
• Report Number(s): N-8312449; NASA-TP-2055; E-1125
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CIM MODEL
COMPOSITE MODELS
ELASTICITY
FINITE ELEMENT METHOD
FLUIDIZED BED HEAT EXCHANGERS
HEAT EXCHANGERS
MATERIALS TESTING
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
NUMERICAL SOLUTION
PARTICLE MODELS
RELAXATION
SERVICE LIFE
STRAINS
STRESS ANALYSIS
STRESS INTENSITY FACTORS
STRESSES
TENSILE PROPERTIES
TESTING
THERMAL STRESSES
THERMOELASTICITY