15 research outputs found
Correlation of Creep-Rupture Data for Complex Alloys at Elevated Temperatures
The main tendency towards the development of the methods for predicting long-time data on of metallic materials is to derive the correlation relationships, which should be as general as possible. This paper presents the verification of the fact that a sufficiently accurate estimation of the peculiarities of the portions of experimental diagrams and generalization of this information can be of great importance for a considerable progress in the prediction
Correlation of Creep-Rupture Data for Complex Alloys at Elevated Temperatures
The main tendency towards the development of the methods for predicting long-time data on of metallic materials is to derive the correlation relationships, which should be as general as possible. This paper presents the verification of the fact that a sufficiently accurate estimation of the peculiarities of the portions of experimental diagrams and generalization of this information can be of great importance for a considerable progress in the prediction
The use of the method of base diagrams for predicting the long-term strength under static and cyclic loading
It is shown that the experience of processing the large amounts of experimental data
on the long-term strength of heat-resistant steels and alloys using the method of base
diagrams, which were obtained from testing of smooth specimens, can be used effectively for
proper processing of test results for notched specimens. Extensive research has been carried
out in order to find an appropriate combination of a lifetime prediction rule and a suitable
constitutive model to give a reliable prediction of lifetime in idealized creep-rupture-low
cycle fatigue interaction conditions
A Critical Analysis of the Conventionally Employed Creep Lifing Methods
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