Accurate Effective Stress Measures: Predicting Creep Life for 3D Stresses Using 2D and 1D Creep Rupture Simulations and Data

Operating structural components experience complex loading conditions resulting in 3D stress states. Current design practice estimates multiaxial creep rupture life by mapping a general state of to uniaxial correlation using effective measures. The data supporting the development measures are nearly always only and biaxial, as tests not widely available. This limitation means current must extrapolate from 2D states, potentially introducing extrapolation error. In this work, we use physics-based, crystal plasticity finite element model simulate uniaxial, triaxial rupture. We virtual dataset assess accuracy novel extrapolating stresses also explore how predictive might change if experimental was confirm these conclusions, based on simulation data, against for several materials, drawn literature. results experiments show that calibrating test would significantly improve some more accurate than others, particularly highly Results obtained numerical findings suggest unified measure should include an explicit dependence first invariant, maximum tensile principal stress, von Mises stress.