Influence of changing loading directions on damage in sheet metal forming

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dc.contributor.authorLennemann, Philipp
dc.contributor.authorKorkolis, Yannis P.
dc.contributor.authorTekkaya, A. Erman
dc.date.accessioned2025-06-26T10:23:55Z
dc.date.available2025-06-26T10:23:55Z
dc.date.issued2024-03-12
dc.description.abstractThe impact of the stress state on damage evolution, fracture behavior, and product performance is well understood for proportional loading. However, many complex sheet forming operations involve non-proportional loading, which affect the material's hardening and fracture characteristics. This study investigates the influence of a loading direction change on damage evolution in a dual phase steel DP800. Specimens are pre-strained by tensile tests and subsequently loaded in either the same or orthogonal direction to the initial pre-strain direction by additional tensile tests and bending tests. Damage quantification by scanning electron microscopy reveals lower damage evolution after an orthogonal change of loading direction in contrast to monotonic loading directions. The load paths, defined as a history of triaxiality and Lode parameter during loading, are identified numerically under consideration of kinematic hardening. Since kinematic hardening leads to higher triaxialities after orthogonal changes, the load path is not the dominant influence on damage. A possible explanation for the experimental results is the void characteristics after tensile load. After the pre-straining in tensile test, voids are oriented orthogonally to the tensile direction and located between hard martensitic phases. The influence of this morphology on subsequent void growth is illustrated by a simulation verifying that an orthogonal change of loading direction results in void shrinkage, while monotonic loading directions lead to further void growth.en
dc.identifier.urihttp://hdl.handle.net/2003/43781
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-25555
dc.language.isoen
dc.relation.ispartofseriesAdvances in industrial and manufacturing engineering; 8
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectDamageen
dc.subjectSheet formingen
dc.subjectStrain path changesen
dc.subjectCharacterizationen
dc.subjectAnisotropyen
dc.subject.ddc620
dc.subject.ddc670
dc.subject.rswkWerkstoffschädigung
dc.subject.rswkBlechumformen
dc.subject.rswkDualphasenstahl
dc.subject.rswkLastwechselverhalten
dc.subject.rswkMaterialcharakterisierung
dc.subject.rswkAnisotropie
dc.subject.rswkZugversuch
dc.titleInfluence of changing loading directions on damage in sheet metal formingen
dc.typeText
dc.type.publicationtypeArticle
dcterms.accessRightsopen access
eldorado.secondarypublicationtrue
eldorado.secondarypublication.primarycitationPhilipp Lennemann, Yannis P. Korkolis, A. Erman Tekkaya, Influence of changing loading directions on damage in sheet metal forming, Advances in Industrial and Manufacturing Engineering, Volume 8, 2024, 100139, https://doi.org/10.1016/j.aime.2024.100139.
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.1016/j.aime.2024.100139

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