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Topology optimizati...
Topology optimization using a continuous-time high-cycle fatigue model
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- Suresh, Shyam (författare)
- Linköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten
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- Lindström, Stefan (författare)
- Linköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten
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- Thore, Carl-Johan (författare)
- Linköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten
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- Torstenfelt, Bo (författare)
- Linköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten
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- Klarbring, Anders (författare)
- Linköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten
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(creator_code:org_t)
- 2019-11-26
- 2020
- Engelska.
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Ingår i: Structural and multidisciplinary optimization (Print). - : SPRINGER. - 1615-147X .- 1615-1488. ; 61:3, s. 1011-1025
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We propose a topology optimization method that includes high-cycle fatigue as a constraint. The fatigue model is based on a continuous-time approach where the evolution of damage in each point of the design domain is governed by a system of ordinary differential equations, which employs the concept of a moving endurance surface being a function of the stress and back stress. Development of fatigue damage only occurs when the stress state lies outside the endurance surface. The fatigue damage is integrated for a general loading history that may include non-proportional loading. Thus, the model avoids the use of a cycle-counting algorithm. For the global high-cycle fatigue constraint, an aggregation function is implemented, which approximates the maximum damage. We employ gradient-based optimization, and the fatigue sensitivities are determined using adjoint sensitivity analysis. With the continuous-time fatigue model, the damage is load history dependent and thus the adjoint variables are obtained by solving a terminal value problem. The capabilities of the presented approach are tested on several numerical examples with both proportional and non-proportional loads. The optimization problems are to minimize mass subject to a high-cycle fatigue constraint and to maximize the structural stiffness subject to a high-cycle fatigue constraint and a limited mass.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
Nyckelord
- Continuous-time approach; Endurance surface; High-cycle fatigue; Topology optimization; Adjoint sensitivity analysis; Aggregation function
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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