Constitutive modeling for isotropic materials (HOST). Annual Status Report

Technical Report · Thu Aug 01 00:00:00 EDT 1985

OSTI ID:6150759

Lindholm, U S; Chan, K S; Bodner, S R; Weber, R M; Walker, K P; Cassenti, B N

This report presents the results of the second year of work on a problem which is part of the NASA HOST Program. Its goals are: (1) to develop and validate unified constitutive models for isotropic materials, and (2) to demonstrate their usefulness for structural analyses of hot section components of gas turbine engines. The unified models selected for development and evaluation are that of Bodner-Partom and Walker. For model evaluation purposes, a large constitutive data base is generated for a B1900 + Hf alloy by performing uniaxial tensile, creep, cyclic, stress relation, and thermomechanical fatigue (TMF) tests as well as biaxial (tension/torsion) tests under proportional and nonproportional loading over a wide range of strain rates and temperatures. Systematic approaches for evaluating material constants from a small subset of the data base are developed. Correlations of the uniaxial and biaxial tests data with the theories of Bodner-Partom and Walker are performed to establish the accuracy, range of applicability, and integability of the models. Both models are implemented in the MARC finite element computer code and used for TMF analyses. Benchmark notch round experiments are conducted and the results compared with finite-element analyses using the MARC code and the Walker model.

• Research Organization: Southwest Research Inst., San Antonio, TX (USA)
• OSTI ID: 6150759
• Report Number(s): N-86-10589
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOY-B-1900
MECHANICAL PROPERTIES
MATHEMATICAL MODELS
COMBUSTION CHAMBERS
COMPARATIVE EVALUATIONS
FINITE ELEMENT METHOD
FRACTURE MECHANICS
GAS TURBINE ENGINES
HAFNIUM ADDITIONS
HIGH TEMPERATURE
STRESS RELAXATION
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
ENGINES
HAFNIUM ALLOYS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MECHANICS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL SOLUTION
RELAXATION
TANTALUM ALLOYS
TITANIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties