The Determination of the Bodner Material Coefficients for Indium 718 and Their Effects on Cyclic Loading.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Development and use of new materials and technologies for use in high temperature environments are dependent on the availability of a material model appropriate for such applications. The Bodner-Partom constitutive model show promising flexibility in modeling materials under such conditions. Evaluation of the models adequacy and range of application has thus far been hampered by a lack of physical understanding of the models coefficients and the lack of a systematic method for evaluating them. This study uses experimental data for IN indium 718 at 1200 F to establish a systematic approach to the evaluation of the Bodner coefficients. Parametric studies were used to develop a comprehensive description of each coefficient and its impact on the material model. A simple extension of the Bodner constitutive equations to model cyclic loading situations was carried out. Results show that systematic evaluation of the Bodner coefficients from experimental data is achievable although somewhat subjective in nature. Cyclic load studies revealed that the Bodner model is capable of modeling isotropic and directional strain hardening as well as strain softening.
- Metallurgy and Metallography
- Numerical Mathematics