A Critical Analysis of the Conventionally Employed Creep Lifing Methods.
A Critical Analysis of the Conventionally Employed Creep Lifing Methods.
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DOI：
10.3390/ma7053371
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发表时间：
2014-04-29
期刊：
影响因子：
--
通讯作者：
Perkins K
中科院分区：
文献类型：
--
作者：
Abdallah Z;Gray V;Whittaker M;Perkins K
结构合金的变形给发电厂和航空航天应用带来了问题，因为需要提高温度以提高效率和减少温室气体排放。这些应用中使用的材料经历了恶劣的环境，这可能会导致关键部件的变形和失效。为了避免这样的灾难性故障并提高效率，未来的设计必须使用具有增强温度能力的新型/改进的合金系统。在认识到这一问题时，对蠕变的详细了解对于这些设计的成功至关重要，因为它可以确保部件不会经历可能最终导致故障的过度变形。为了实现这一点，已经开发了各种参数方法来量化高温应用中的蠕变和蠕变断裂。这项研究回顾了一些众所周知的传统上使用的蠕动举升方法，也包括了一些最近的方法。本文的第一部分着重于预测长期蠕变断裂特性，这是发电部门感兴趣的一个领域。第二部分着眼于预定义的应变和基于现有数据的完整蠕变曲线的再现，这与航空航天工业有关，在航空航天工业中，部件在故障之前进行更换。
The deformation of structural alloys presents problems for power plants and aerospace applications due to the demand for elevated temperatures for higher efficiencies and reductions in greenhouse gas emissions. The materials used in such applications experience harsh environments which may lead to deformation and failure of critical components. To avoid such catastrophic failures and also increase efficiency, future designs must utilise novel/improved alloy systems with enhanced temperature capability. In recognising this issue, a detailed understanding of creep is essential for the success of these designs by ensuring components do not experience excessive deformation which may ultimately lead to failure. To achieve this, a variety of parametric methods have been developed to quantify creep and creep fracture in high temperature applications. This study reviews a number of well-known traditionally employed creep lifing methods with some more recent approaches also included. The first section of this paper focuses on predicting the long-term creep rupture properties which is an area of interest for the power generation sector. The second section looks at pre-defined strains and the re-production of full creep curves based on available data which is pertinent to the aerospace industry where components are replaced before failure.