Unifying the crystal plasticity, neuber/glinka and elastic follow-up frameworks to evaluate creep-fatigue in gas turbine single crystal nickel superalloys

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-09-01 DOI:10.1016/j.ijfatigue.2025.109249

Christos Skamniotis

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引用次数: 0

Abstract

A local strain method is developed to estimate creep-fatigue life at hot spots based on linear elastic FE analysis. The method combines the concepts of Crystal Plasticity, Neuber/Glinka and elastic follow-up factor and predicts cyclic plastic-creep deformation at the hole of a Nickel-based single crystal plate under temperature cycling between 20 °C and 1100 °C. The results agree with Crystal Plasticity Finite Element (CPFE) simulations and indicate that: (a) Neuber/Glinka rules apply to single crystal cubic metals, (b) the increase of Young’s modulus on shutdown drives excessive residual stresses and low cycle fatigue, (c) the elastic follow-up factor

Z

increases during non-local creep at high temperature, but room temperature plasticity on unloading resets

Z

to low values. The competition between hot creep and cold plasticity controls whether local strain-ratchetting occurs in compressive or the tensile direction and cannot be captured by Neuber/Glinka rules alone. However, the combination of Glinka and Neuber suffices to predict reasonably well the cyclic strain range related to low cycle fatigue. These results extend the understanding of fatigue-creep-ratchetting failure to leverage industrial/academic research on the structural integrity of high temperature technologies, including fusion/fission reactors, hydrogen gas turbines, re-usable space vehicles.

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统一晶体塑性、neuber/glinka和弹性随动框架评价燃气轮机单晶镍高温合金蠕变疲劳

在线弹性有限元分析的基础上，提出了一种局部应变法估算热点蠕变疲劳寿命。该方法结合晶体塑性、Neuber/Glinka和弹性随动因子的概念，预测了镍基单晶板在20℃~ 1100℃温度循环下孔处的循环塑性蠕变变形。结果与晶体塑性有限元（CPFE）模拟结果一致，表明：(a) Neuber/Glinka规则适用于单晶立方金属；(b)关闭时杨氏模量的增加导致残余应力过大和低周疲劳；(c)高温下非局部蠕变时弹性随动因子Z增加，但卸载时的室温塑性使Z复位到低值。热蠕变和冷塑性之间的竞争控制着局部应变棘轮是发生在压缩方向还是拉伸方向，不能仅用Neuber/Glinka规则来捕获。然而，Glinka和Neuber的结合足以较好地预测与低周疲劳相关的循环应变范围。这些结果扩展了对疲劳-蠕变-棘轮失效的理解，以利用对高温技术结构完整性的工业/学术研究，包括聚变/裂变反应堆、氢燃气轮机、可重复使用的太空飞行器。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.