Combined notch and size effect modeling in a local probabilistic approach for LCF

L Mäde, S Schmitz, H Gottschalk, T Beck - Computational Materials Science, 2018 - Elsevier
In recent years a local probabilistic model for low cycle fatigue (LCF) based on the statistical
size effect has been developed and applied on engineering components. Here, the notch …

Probabilistic notch fatigue assessment under size effect using weakest link theory

WQ Dai, SP Zhu, JC He, AT Taddesse… - Engineering Fracture …, 2022 - Elsevier
Notch and size effects exerts significant influence on the fatigue performances of
engineering components. In the present study, a probabilistic framework for fatigue life …

Probabilistic lcf risk evaluation of a turbine vane by combined size effect and notch support modeling

L Mäde, H Gottschalk, S Schmitz… - … Expo: Power for …, 2017 - asmedigitalcollection.asme.org
A probabilistic risk assessment for low cycle fatigue (LCF) based on the so-called size effect
has been applied on gas-turbine design in recent years. In contrast, notch support modeling …

Probabilistic modeling of slip system-based shear stresses and fatigue behavior of coarse-grained Ni-base superalloy considering local grain anisotropy and grain …

B Engel, L Mäde, P Lion, N Moch, H Gottschalk, T Beck - Metals, 2019 - mdpi.com
New probabilistic lifetime approaches for coarse grained Ni-base superalloys supplement
current deterministic gas turbine component design philosophies; in order to reduce safety …

Probabilistic Schmid factors and scatter of low cycle fatigue (LCF) life: Probabilistischer Schmid‐Faktor und Streuband der Lebensdauer bei niedrigen Lastspielzahlen …

H Gottschalk, S Schmitz, T Seibel… - Materialwissenschaft …, 2015 - Wiley Online Library
We investigated the scatter in the cycles to crack initiation for conventionally cast specimens
of the superalloy RENE 80 in total strain controlled low cycle fatigue (LCF) tests at 850° C …

Optimal reliability in design for fatigue life

H Gottschalk, S Schmitz - SIAM Journal on Control and Optimization, 2014 - SIAM
The failure of a component often is the result of a degradation process that originates with
the formation of a crack. Fatigue describes the crack formation in the material under cyclic …

Adjoint method to calculate the shape gradients of failure probabilities for turbomachinery components

H Gottschalk, M Saadi… - … Expo: Power for …, 2018 - asmedigitalcollection.asme.org
In the optimization of turbomachinery components, shape sensitivities for fluid dynamical
objective functions have been used for a long time. As peak stress is not a differential …

Low-cycle fatigue lifetime estimation and predictive maintenance for a gas turbine compressor vane carrier under varying operating conditions

Z Han, Z Jiang, S Ehrt, M Li - Journal of …, 2021 - asmedigitalcollection.asme.org
In the age of Industry 4.0, the capability of health management is critical to the design and
maintenance of gas turbines. This study presents a probabilistic method to estimate the low …

An analytical study in multi-physics and multi-criteria shape optimization

H Gottschalk, M Reese - Journal of Optimization Theory and Applications, 2021 - Springer
A simple multi-physical system for the potential flow of a fluid through a shroud, in which a
mechanical component, like a turbine vane, is placed, is modeled mathematically. We then …

Shape gradients for the failure probability of a mechanic component under cyclic loading: a discrete adjoint approach

H Gottschalk, M Saadi - Computational Mechanics, 2019 - Springer
This work provides a numerical calculation of shape gradients of failure probabilities for
mechanical components using a first discretize, then adjoin approach. While deterministic …