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Fatigue-creep and plastic collapse of notched bars

Ponter, Alan R.S. and Chen, Haofeng and Willis, M. and Evans, J. (2004) Fatigue-creep and plastic collapse of notched bars. Fatigue and Fracture of Engineering Materials and Structures, 27. pp. 305-318. ISSN 8756-758X

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Abstract

The paper describes a study of the application of a new assessment method, based on the linear matching method (LMM), to the creep fatigue of notched bars of Udimet 720Li at 650 °C. This high strength nickel based alloy is taken as typical of alloys used in high temperature gas turbine applications. The primary purpose of the study is to see whether it is possible to predict the failure modes for such alloys in terms of standard materials data by the evaluation of a sequence of simplified calculations corresponding to the steady state cyclic stress history. These calculations involve the evaluation of limit load, shakedown limit and ratchet limit for perfect plasticity, rapid cycle creep solutions and the evaluation of an elastic follow-up factor. Within the limitations of the tests, the correlation between predicted failure mode and observed mode is very good and the calculations clearly show up the differences between the two types of notched bars discussed. This implies that LM methods are well suited to the evaluation of failure modes in materials of this type.

Item type: Article
ID code: 36391
Keywords: plasticity, creep-reverse plasticity, fatigue analysis, Mechanical engineering and machinery, Mechanics of Materials, Materials Science(all), Mechanical Engineering
Subjects: Technology > Mechanical engineering and machinery
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 12 Dec 2011 12:12
    Last modified: 02 Jun 2014 11:16
    URI: http://strathprints.strath.ac.uk/id/eprint/36391

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