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  <doc>
    <id>33990</id>
    <completedYear/>
    <publishedYear/>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>533</pageFirst>
    <pageLast>552</pageLast>
    <pageNumber/>
    <edition/>
    <issue>3</issue>
    <volume>5</volume>
    <type>articlenr</type>
    <publisherName>MDPI</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>2024-08-09</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Thermomechanical analysis of PBF-LB/M AlSi7Mg0.6 with respect to rate-dependent material behaviour and damage effects</title>
    <abstract language="eng">This paper describes the self-heating effects resulting from mechanical deformation in the additively manufactured aluminium alloy AlSi7Mg0.6. The material’s self-heating effect results from irreversible changes in the material’s microstructure that are directly coupled with the inelastic deformations. These processes are highly dissipative, which is reflected in the heat generation of the material. To describe such effects, a numerical framework that combines an elasto-viscoplastic Chaboche model with the Gurson Tvergaard Needleman damage approach is analysed and thermomechanically extended. This paper characterises the sample preparation, the experimental set-up, the development of the thermomechanical approach, and the material model. A user material subroutine applies the complete material model for the finite element software Abaqus 2022. To validate the material model and the parameters, a complex tensile test is performed. In order to check the finite element model, the energy transformation ratio is included in the evaluation. The numerical analyses of the mechanical stress evolution and the self-heating behaviour demonstrate good agreement with the experimental test. In addition, the calculation shows the expected behaviour of the void volume fraction that rises from the initial value of 0.0373%to a higher value under a complex mechanical load.</abstract>
    <parentTitle language="eng">Applied Mechanics</parentTitle>
    <identifier type="issn">2673-3161</identifier>
    <identifier type="doi">10.3390/applmech5030030</identifier>
    <enrichment key="opus.import.date">2024-09-06T13:28:23+00:00</enrichment>
    <enrichment key="opus.source">sword</enrichment>
    <enrichment key="opus.import.user">deepgreen</enrichment>
    <enrichment key="opus.import.file">attachment; filename=deposit.zip</enrichment>
    <enrichment key="opus.import.checksum">45600fb41dc94afd65112837c83ed0ca</enrichment>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Publikationsweg">Open Access</enrichment>
    <author>
      <firstName>Lukas</firstName>
      <lastName>Richter</lastName>
    </author>
    <author>
      <firstName>Irina</firstName>
      <lastName>Smolina</lastName>
    </author>
    <author>
      <firstName>Andrzej</firstName>
      <lastName>Pawlak</lastName>
    </author>
    <author>
      <firstName>Daniela</firstName>
      <lastName>Schob</lastName>
    </author>
    <author>
      <firstName>Robert</firstName>
      <lastName>Roszak</lastName>
    </author>
    <author>
      <firstName>Philipp</firstName>
      <lastName>Maasch</lastName>
    </author>
    <author>
      <firstName>Matthias</firstName>
      <lastName>Ziegenhorn</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>thermomechanics</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>self-heating</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>energy storage</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Chaboche-model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Gurson-Tvergaard-Needleman-model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>damage effects</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>user subroutine (UMAT)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Laser Powder Bed Fusion of Metals (PBF-LB/M) fabricated AlSi7Mg0.6</value>
    </subject>
    <collection role="Import" number="import">Import</collection>
    <collection role="institutes" number="3305">FG Technische Mechanik und Maschinendynamik</collection>
  </doc>
  <doc>
    <id>32345</id>
    <completedYear/>
    <publishedYear>2024</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>15</pageNumber>
    <edition/>
    <issue>1</issue>
    <volume>17</volume>
    <type>conferenceobject_ref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2024-01-09</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Characterization and Simulation of Shear-Induced Damage in Selective-Laser-Sintered Polyamide 12</title>
    <abstract language="eng">This paper presents the characterisation of selective-laser-sintered (SLS) samples of polyamide 12 (PA12) under shear loading. PA12 is a semi-crystalline thermoplastic and is used in various industries. Its behaviour under shear stress, which is particularly important for product reliability, has not yet been sufficiently investigated. This research focuses on understanding the material and damage behaviour of PA12 under shear-induced stress conditions. The study included quasi-static experiments and numerical simulations. Samples were prepared via SLS and tested according to ASTM standards. Digital image correlation (DIC) was used for precise deformation measurements. The Chaboche material model was used for the viscoplastic behaviour in the numerical simulations. Due to existing material discontinuities in the form of voids, the material model was coupled with the Gurson–Tvergaard–Needleman (GTN) damage model. A modified approach of the GTN model was used to account for low stress triaxiality under shear loading. These models were implemented in MATLAB and integrated into Abaqus via a User Material (UMAT) subroutine. The results of the experiments and simulations showed a high degree of accuracy. An important finding was the significant influence of the shear factor kw on the damage behaviour, especially during failure. This factor proved to be essential for the accurate prediction of material behaviour under shear-induced stress conditions. The integration of the modified GTN model with the Chaboche material model in UMAT enables an accurate prediction of the material and damage behaviour and thus makes an important contribution to the understanding of the mechanical material behaviour of SLS PA12 specimens.</abstract>
    <parentTitle language="eng">Materials</parentTitle>
    <identifier type="issn">1996-1944</identifier>
    <identifier type="url">https://www.mdpi.com/1996-1944/17/1/38</identifier>
    <identifier type="doi">10.3390/ma17010038</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Publikationsweg">Open Access</enrichment>
    <enrichment key="opus.source">publish</enrichment>
    <enrichment key="Artikelnummer">38</enrichment>
    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <enrichment key="Fprofil">4 Künstliche Intelligenz und Sensorik / Artificial Intelligence and Sensor Technology</enrichment>
    <author>
      <firstName>Daniela</firstName>
      <lastName>Schob</lastName>
    </author>
    <submitter>
      <firstName>Daniela</firstName>
      <lastName>Schob</lastName>
    </submitter>
    <author>
      <firstName>Lukas</firstName>
      <lastName>Richter</lastName>
    </author>
    <author>
      <firstName>Krzysztof</firstName>
      <lastName>Kotecki</lastName>
    </author>
    <author>
      <firstName>Dariusz</firstName>
      <lastName>Kurpisz</lastName>
    </author>
    <author>
      <firstName>Robert</firstName>
      <lastName>Roszak</lastName>
    </author>
    <author>
      <firstName>Philipp</firstName>
      <lastName>Maasch</lastName>
    </author>
    <author>
      <firstName>Matthias</firstName>
      <lastName>Ziegenhorn</lastName>
    </author>
    <collection role="institutes" number="3305">FG Technische Mechanik und Maschinendynamik</collection>
  </doc>
</export-example>
