<div class="csl-bib-body">
<div class="csl-entry">Arslan, E., & Mack, W. (2022). <i>Sensitivity of predicted stresses in thick-walled steel/ceramics spherical FGM-structures to parameter uncertainties</i> [Conference Presentation]. 92nd Annual Meeting of the International Association of Applied Mathematics and Mechanics, Aachen, Germany. https://doi.org/10.1002/pamm.202200161</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/154109
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dc.description.abstract
The reliability of strength-predictions for devices of functionally graded materials (FGMs) depends both on appropriate homogenization schemes and the accuracy of the basic material data. Whereas there exist many studies on proper homogenization techniques for various FGMs, the question for the required precision of the material data has been addressed to a significantly lesser extent; almost all of the few available studies on this issue focus on the statics and dynamics of beams and (thin-walled) FGM-plates and FGM-shells. Indeed, the values of the material parameters of FGM-constituents given in even quite recent publications may vary – depending on the specific material considered – noticeably. Moreover, caused by the manufacturing process, the actual volume fractions of the constituents will deviate to some extent from the designed ones. Hence, it is the aim of the present investigation to study the influence of parameter uncertainties on the forecasted behavior of thick-walled hollow spherical FGM-structures under both internal pressure and homogeneous heating, taking also uncertainties caused by the manufacturing process into account. Of course, the maximum stresses to be expected are the most critical ones from an engineering point of view. Since statistical information about the scattering of the relevant data is hardly obtainable in practice, the study is based on maximum intervals of published parameter values. Specifically, numerical results are given for a spherical pressure vessel of steel/ceramics FGM. Power-law grading is presupposed, and both Voigt and Reuss rule – representing the extremum cases - for Young’s modulus are considered; Poisson’s ratio and the coefficient of thermal expansion are presumed to follow the rule of mixtures. The main findings are as follows. First, both the forecasted maximum and minimum stresses always are related with the bounds of all the individual parameter intervals. Second, scattering ranges of the material data may cause much larger expectation ranges for the maximum stresses (in percentages). Third, the influence of manufacturing uncertainties is less pronounced than that of – particularly – uncertain Young’s moduli and coefficients of thermal expansion. Fourth, consideration of the scattering of the stress distributions due to material data uncertainties may noticeably predominate over the question for the most appropriate homogenization scheme(s); hence, application of sophisticated and computationally expensive homogenization procedures seems meaningful only if the material data are available with quite high accuracy.
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dc.language.iso
en
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dc.subject
Uncertainties of material properties, Homogenization scheme, steel/ceramics FGM, Pressure vessel, Thermo-mechanical load
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dc.title
Sensitivity of predicted stresses in thick-walled steel/ceramics spherical FGM-structures to parameter uncertainties
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.type.category
Conference Presentation
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tuw.researchTopic.id
M2
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tuw.researchTopic.id
C6
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tuw.researchTopic.id
C1
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.name
Modeling and Simulation
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tuw.researchTopic.name
Computational Materials Science
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tuw.researchTopic.value
40
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tuw.researchTopic.value
40
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tuw.researchTopic.value
20
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tuw.publication.orgunit
E325-01 - Forschungsbereich Technische Dynamik und Fahrzeugdynamik
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tuw.publisher.doi
10.1002/pamm.202200161
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tuw.event.name
92nd Annual Meeting of the International Association of Applied Mathematics and Mechanics
en
tuw.event.startdate
15-08-2022
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tuw.event.enddate
19-08-2022
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
Aachen
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tuw.event.country
DE
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tuw.event.presenter
Arslan, Eray
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dc.relation.ispreviousversionof
10.1002/pamm.202200161
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wb.sciencebranch
Maschinenbau
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wb.sciencebranch
Metallurgie
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wb.sciencebranch.oefos
2030
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wb.sciencebranch.oefos
2111
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wb.sciencebranch.value
60
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wb.sciencebranch.value
40
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item.openairetype
Presentation
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item.openairetype
Vortrag
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item.grantfulltext
none
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item.cerifentitytype
Publications
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item.cerifentitytype
Publications
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item.languageiso639-1
en
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item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.fulltext
no Fulltext
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crisitem.author.dept
E325-01 - Forschungsbereich Technische Dynamik und Fahrzeugdynamik
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crisitem.author.dept
E325 - Institut für Mechanik und Mechatronik
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crisitem.author.parentorg
E325 - Institut für Mechanik und Mechatronik
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crisitem.author.parentorg
E300 - Fakultät für Maschinenwesen und Betriebswissenschaften