| Abstract Scope |
This work investigates the thermomechanical response of turbine disks in full-flow staged combustion turbopumps that are subjected to cyclic loading conditions. A finite element model is developed to capture both elastic and inelastic deformation behaviors, including time-independent plasticity. A particular focus on temperature-dependent effects (e.g., temperature dependent properties, potential interactions with creep) will also be included as part of the broader evaluation of longer-term performance and reliability. Using Monel K500 and Inconel 718 as candidate baseline materials, we systematically explore how variations in key performance parameters (e.g., geometric, thermophysical properties, and hardening behaviors) influence the transition among failure regimes (e.g., burst, fatigue, plastic collapse, shakedown). The results are summarized in design aides: Bree Load Interaction Diagrams. By examining how different performance parameters shift failure regime boundaries in the Bree Diagrams, this study supports materials based interventions in early-stage turbopump design iterations. |