About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
High-Temperature Corrosion and Degradation of Materials
|
| Presentation Title |
Predicting Creep Deformation and Damage Using the Wilshire Cano Stewart (WCS) Model with Strain Energy Density (SED) for Alloy 617 |
| Author(s) |
Kojo Benefo, Calvin M. Stewart |
| On-Site Speaker (Planned) |
Kojo Benefo |
| Abstract Scope |
This study applies strain energy dissipation (SED) to evaluate calibration methods to increase prediction accuracy. Strain Energy Dissipation is the total “true” strain energy released during a creep test. When normalized, SED is suitable as a damage parameter for calibrating the Wilshire-Cano-Stewart (WCS) model, which predicts creep deformation, damage evolution, and rupture across various stresses and temperatures. Accurate creep prediction is essential to prevent unexpected creep rupture. The SED measurement is applied to Alloy 617 creep data from the Idaho National Laboratory, which includes specimens with different heat treatments. The creep tests range from 800-1000°C at various stress levels. The study calibrates the model using a pair of alternative methods—minimization of the average objective error and minimization of the error for each individual test—to generate material constants by isotherm and test. It then compares these material constants and assesses the accuracy of the predictions against experimental data. |