Towards deterministic computation of internal stresses in additively manufactured materials under fatigue loading: part I

Simple item page
dc.contributor.authorAwd, Mustafa
dc.contributor.authorLabanie, Mhd Fateh
dc.contributor.authorMöhring, Kerstin
dc.contributor.authorFatemi, Ali
dc.contributor.authorWalther, Frank
dc.date.accessioned2020-06-02T13:32:29Z
dc.date.available2020-06-02T13:32:29Z
dc.date.issued2020-05-18
dc.description.abstractThe ongoing studies of the influence of internal defects on fatigue strength of additively manufactured metals adopted an internal crack or notch-like model at which the threshold stress intensity factor is the driving mechanism of fatigue failure. The current article highlights a shortcoming of this approach and offers an alternative based on X-ray microcomputed tomography and cyclic plasticity with a hybrid formulation of Chaboche and Armstrong–Frederick material laws. The presented tessellation and geometrical transformation scheme enabled a significantly more realistic morphological representation of internal defects that yielded a cyclic strain within 2% of the experimental values. This means that cyclic plasticity models have an accurate prediction of mechanical properties without repeating a full set of experiments for additively manufactured arbitrary microstructures. The coupling with a material law that is oriented towards the treatment of cyclic hardening and softening enabled more accurate computation of internal stresses under cyclic loading than ever before owing to the maturity of tessellation and numerical tools since then. The resulting stress–strain distributions were used as input to the Fatemi–Socie damage model, based on which a successful calculation of fatigue lifetime became possible. Furthermore, acting stresses on the internal pores were shown to be more than 450% concerning the applied remote stress amplitude. The results are a pretext to a scale bridging numerical solution that accounts for the short crack formation stage based on microstructural damage.en
dc.identifier.urihttp://hdl.handle.net/2003/39165
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-21083
dc.language.isoende
dc.relation.ispartofseriesMaterials;13(10)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectAdditive manufacturingen
dc.subjectMicrocomputed tomography (µ-CT)en
dc.subjectFatigue loadingen
dc.subjectCyclic plasticityen
dc.subjectFatemi-Socie damage parameteren
dc.subject.ddc660
dc.subject.rswkRapid Prototyping <Fertigung>de
dc.subject.rswkMikrocomputertomographiede
dc.subject.rswkMaterialermüdungde
dc.subject.rswkDeformationsverhaltende
dc.titleTowards deterministic computation of internal stresses in additively manufactured materials under fatigue loading: part Ien
dc.typeTextde
dc.type.publicationtypearticlede
dcterms.accessRightsopen access
eldorado.secondarypublicationtruede
eldorado.secondarypublication.primarycitationAwd, M.; Labanie, M.F.; Moehring, K.; Fatemi, A.; Walther, F. Towards Deterministic Computation of Internal Stresses in Additively Manufactured Materials under Fatigue Loading: Part I. Materials 2020, 13, 2318.de
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.3390/ma13102318de

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
materials-13-02318-v2.pdf
Size:
5.5 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
4.85 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Lehrstuhl für Werkstoffprüftechnik