Materials selection to resist creep

Ashby, Michael F.; Abel, C.A.

doi:10.1007/978-94-011-0589-7_3

Cited by 4 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 9, experimental results are closely reproduced by the present model. Predictions for time to 1% strain -often used as a design parameter for turbine blade applications [143] are close to measured values. Only two parameters were varied in order to achieve good agreement -the coefficients for dislocation multiplication and attrition, M and φ, in Equation (20).…”

Section: Predictions Of Tertiary Creep In Cmsx-4supporting

confidence: 56%

Critical assessment 31: On the modelling of tertiary creep in single-crystal superalloys

Sulzer

Reed

2018

Materials Science and Technology

View full text Add to dashboard Cite

Modelling of tertiary creep in single-crystal superalloys -operative over the majority of the temperature/stress regime of relevance -is assessed. Traditional, empirical approaches are useful for the prediction of component life; a modern trend is for more physically faithful models which account for microstructure and alloy composition. Calculations are made using different methods, to identify advantages/disadvantages, in an effort to approach best practice. The predictions are tested against experimental data. The creep resistance can be estimated to within approximately one-half of a Larson-Miller parameter, from an input of alloy composition, deformation conditions, and estimates of microstructural parameters, rate laws (and parameters therein), and physical constants. Different merit indices are considered to identify the most appropriate for compositional optimisation.

show abstract

Section: Predictions Of Tertiary Creep In Cmsx-4supporting

confidence: 56%

Critical assessment 31: On the modelling of tertiary creep in single-crystal superalloys

Sulzer

Reed

2018

Materials Science and Technology

View full text Add to dashboard Cite

show abstract

“…While a number of reports were identified dealing with the creep-controlled material-selection problems, the basis for material selection employed is essentially the same as that presented in the seminal work of Ashby and Abel. 4 Consequently, in the remainder of this subsection, only a brief overview of the approach developed by Ashby and Abel 4 for creep-controlled material selection will be presented. It should be noted that, while one can generally identify four subtypes of the creep-controlled material-selection problems, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…(i) excessive creep deformation; (ii) creep rupture; (iii) creep relaxation; and (iv) creep-induced buckling, only the case of creep relaxation will be analyzed here. Furthermore, the approach of Ashby and Abel 4 is strictly applicable only to the case of the components subjected to a uniform (but time-varying) stress-state, e.g. the case of a bolt pre-tensioned to provide the necessary clamping force at high operating temperatures at which creep relaxation is active.…”

Section: Introductionmentioning

confidence: 99%

“…There are two main objectives of the present work: (a) development of a fairly rigorous finite-element-based procedure for selection of the materials for use in creep-induced-relaxation-resistance applications; and (b) examination of the suitability of the approach of Ashby and Abel 4 for material selection in the same types of mechanical designs.…”

Section: Introductionmentioning

confidence: 99%

“…Details regarding the finite element analysis (FEA) employed and the results obtained for the clamping-spring material selection are presented in the Finite element analysis, results and discussion section. The problem of suitability of the Ashby and Abel 4 approach for clamping-spring material selection is addressed in the Simplified analytical/numerical approach section, and the main conclusions resulting from the present work are summarized in the Summary and conclusions section.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Creep-behavior-based material selection for a clamping spring of ceramic-matrix composite inner-shroud in utility and industrial gas-turbine engines

Grujičić

Galgalikar

Snipes

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

This paper addresses the problem of materials selection for springs used to clamp an inner shroud segment to the outer shroud block in utility and industrial gas turbine engines. Clamping is achieved through the application of an initial compressive load to the spring. However, since the spring is subjected to high temperature and oxidizing conditions, it experiences creep and surface oxidation. Both of these processes result in the loss of the compressive load within the spring with time. A material selection procedure is developed, which identifies optimum materials (design variables), with respect to the minimum loss in the clamping-spring load (objective function) for a given set of geometrical constraints (i.e. maximum size of the spring is constrained by the outer-shroud cavity which houses the spring) and functional constraints (force retention should persist over the expected life of the inner-shroud segment). Two material selection procedures are devised: (a) one, fairly rigorous and computationally intensive, based on the use of a finite element analysis; and (b) the other, less rigorous but computationally less expensive, based on the use of a simplified analytical/ numerical procedure. In the absence of oxidation, the two approaches yielded different, but mutually consistent, results with identical ranking of the clamping-force candidate materials. The inclusion of the oxidation effects showed that oxidation-induced loss in the spring material increases the extent of clamping-force relaxation and may affect the ranking of the candidate materials.

show abstract

Effect of Phosphorous Inoculation on Creep Behavior of a Hypereutectic Al-Si Alloy

Faraji

Khalilpour

2014

J. of Materi Eng and Perform

View full text Add to dashboard Cite

Materials selection to resist creep

Cited by 4 publications

References 4 publications

Critical assessment 31: On the modelling of tertiary creep in single-crystal superalloys

Critical assessment 31: On the modelling of tertiary creep in single-crystal superalloys

Creep-behavior-based material selection for a clamping spring of ceramic-matrix composite inner-shroud in utility and industrial gas-turbine engines

Effect of Phosphorous Inoculation on Creep Behavior of a Hypereutectic Al-Si Alloy

Contact Info

Product

Resources

About