CREEP AND HIGH TEMPERATURE DESIGN
TECHDYN Engineering has solid technical background and experience in modeling, simulation and design of material and components for high temperature applications. In the recent years, we have developed an advanced computational model for creep named CREEPCALC©. The modeling framework is mechanism based and derived according to dislocation mechanics in a building-block logic. Each block can be customized and specialized for the class of material of interest.
CREEPCALC© Module I calculates creep rate evolution in the primary creep stage and creep transients considering the depencende of the apperent activation energy on the internal stress. CREEPCALC© Module II calculates steady state or minimum creep rate evolution over a wide range of stress and temperature including inverse creep at very low stress and power law breakdown. CREEPCALC© Module III calculates tertiary creep and creep rupture based on damage mechanics criteria. The model accounts for both cavitation and microstruture evolution type damage.
Comparison of predicted creep rates and experimental data for pure aluminum.
CREEPCALC Module IV is expecially designed for type IV fracture in welds. It accounts for microstructural features such as grain size in HAZ and related hardness. CREEPCALC© parameters can be determined on short term creep test and used to predict very long creep lives up and beyond 100.000h. The model has been qualified for high chromium steel grades, ferritic steels, titanium alloys and nickel supealloys. TECHDYN Engineering has recently extended the model to single crystal nickel based supealloys.
Comparison of predicted creep rates in primary creep regime for P91 high chromium steel
High temperature design capabilities includes: isotermal fatigue and thermo-mechanical fatigue assessment using strain (energy) range partitioning method.
Fields of application:
oil and gas
Simulation of deformation of single crystal nickel based superalloy (CMSX4) along <001>