Residual stress modeling of PBF-LB

Visa enkel post
dc.contributor.authorFriðriksson, Haukur
dc.contributor.departmentChalmers tekniska högskola / Institutionen för industri- och materialvetenskapsv
dc.contributor.departmentChalmers University of Technology / Department of Industrial and Materials Scienceen
dc.contributor.examinerLarsson, Ragnar
dc.contributor.supervisorOhlsson, David
dc.contributor.supervisorLarsson, Ragnar
dc.date.accessioned2024-09-23T07:05:53Z
dc.date.available2024-09-23T07:05:53Z
dc.date.issued2024
dc.date.submitted
dc.description.abstractThis thesis investigates the modeling of residual stress in laser powder bed fusion (PBF-LB) processes using AdditiveLab as a meso-scale simulation tool. The study aims to evaluate AdditiveLab as a process simulations tool for PBF-LB by repli cating experimentally verified simulations, specifically focusing on 316L stainless steel. A literature review of simulation techniques was conducted, followed by transient thermal and thermo-mechanical simulations, and validation of AdditiveLab’s simulations against experimentally verified models from the literature. The simulations analyzed the thermal distribution, the dimensions of the melt pool, and the development of residual stress. The findings indicate that, while the moving heat source can be modeled using AdditiveLab, limitations of the possible material modeling negatively impact the accuracy of the temperature distribution in meso-scale simulations. The primary limitation being the phase change model, in which the density of the metal powder can only be modeled as being equal to the solid metal density. Although all mesoscale modeling involves simplifications of complex physical phenomena, the assumption of powder properties leads to an overestimation of powder thermal inertia, leading to an overestimation of the melt-pool temperature and an underestimation of the melt-pool depth and width. This thesis discusses these limitations and their impact on predicting thermal behavior and stress development.
dc.identifier.coursecodeIMSX30
dc.identifier.urihttp://hdl.handle.net/20.500.12380/308750
dc.language.isoeng
dc.setspec.uppsokTechnology
dc.subjectLaser Powder Bed Fusion
dc.subjectAdditive Manufacturing
dc.subjectMeso-scale Simulation
dc.subjectAdditiveLab
dc.subjectBoundary Conditions
dc.subjectHeat Source Models
dc.subject316L Stainless Steel
dc.subjectTransient Thermal Simulation
dc.subjectThermomechanical Simulation
dc.titleResidual stress modeling of PBF-LB
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster's Thesisen
dc.type.uppsokH
local.programmeStructural engineering and building technology (MPSEB), MSc
Ladda ner
Original bundle
Visar 1 - 1 av 1
Bild (thumbnail)
Namn:
Residual stress modeling of PBF-LB.pdf
Storlek:
4.13 MB
Format:
Adobe Portable Document Format
Beskrivning:
Ladda ner
License bundle
Visar 1 - 1 av 1
Bild (thumbnail)
Namn:
license.txt
Storlek:
2.35 KB
Format:
Item-specific license agreed upon to submission
Beskrivning:
Ladda ner
Samling
Examensarbeten för masterexamen