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Procedures for handling computationally heavy cyclic load cases with application to a disc alloy material
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.
2019 (English)In: Materials at High Temperature, ISSN 0960-3409, E-ISSN 1878-6413Article in journal (Refereed) Epub ahead of print
Abstract [en]

The computational efficiency in analysing cyclically loaded structures is a highly prioritised issue for the gas turbine industry, as a cycle-by-cycle simulation of e.g. a turbine disc is far too time consuming. Hence, in this paper, the efficiency of two different procedures to handle computational expansive load cases, a numerical extrapolation and a parameter modification procedure, are evaluated and compared to a cycle-by-cycle simulation. For this, a local implementation approach was adopted, where a user-defined material subroutine is used for the cycle jumping procedures with good results. This in contrast to a global approach where the finite element simulation is restarted and mapping of the solution is performed at each cycle jump. From the comparison, it can be observed that the discrete parameter modification procedure is by margin the fastest one, but the accuracy depends on the material parameter optimisation routine. The extrapolation procedure can incorporate stability and/or termination criteria.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD , 2019.
Keywords [en]
Cycle jumping; cyclic response; computational efficiency; gas turbine disc alloy; user-defined material subroutine
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-158970DOI: 10.1080/09603409.2019.1631587ISI: 000473038500001OAI: oai:DiVA.org:liu-158970DiVA, id: diva2:1338059
Note

Funding Agencies|Cleansky [686600]

Available from: 2019-07-19 Created: 2019-07-19 Last updated: 2019-11-08

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