Viscoplastic behavior of a notch root at 650 C: ISDG measurement and finite element modeling

Journal Article · Mon Jan 01 00:00:00 EST 1996 · Journal of Engineering Materials and Technology

DOI:https://doi.org/10.1115/1.2805938· OSTI ID:203574

Li, K ^[1]; Sharpe, Jr, W N ^[2]

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1. Western Michigan Univ., Kalamazoo, MI (United States). Dept. of Mechanical and Aeronautical Engineering
2. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Mechanical Engineering

Viscoplastic behavior of the nickel-based superalloy, Inconel 718, at a notch root has been investigated by conducting isothermal tensile, creep and cyclic elastoplastic tests at 650 C which is the working temperature of the material in aircraft engines. A laser-based interferometric technique was extended to measure biaxial strains over a gage length of 150 {micro}m at the notch root; the computer controlled system permits real-time measurements. A thin-film pure silicon coating and an argon atmosphere were used to prevent oxidation of the reflective indentations that serve as the strain gages. The measured strains were used to evaluate the Bodner-Partom constitutive model which was incorporated into the ABAQUS finite element code. Material constants in the model were determined from uniaxial tests on smooth specimens. The predicted strains agree reasonably well with the measured ones for all three kinds of loadings.

• Sponsoring Organization: USDOE
• OSTI ID: 203574
• Journal Information: Journal of Engineering Materials and Technology, Vol. 118, Issue 1; Other Information: PBD: Jan 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
33 ADVANCED PROPULSION SYSTEMS
INCONEL 718
MECHANICAL PROPERTIES
GAS TURBINE ENGINES
MATERIALS
SAMPLE PREPARATION
NOTCHES
TENSILE PROPERTIES
CREEP
STRESSES
STRAINS
INTERFEROMETRY
LASERS
COMPUTERIZED CONTROL SYSTEMS
MATHEMATICAL MODELS
SIMULATION
FINITE ELEMENT METHOD
CORRELATIONS
EXPERIMENTAL DATA