<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>25585</id>
    <completedYear/>
    <publishedYear>2019</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>507</pageFirst>
    <pageLast>526</pageLast>
    <pageNumber/>
    <edition/>
    <issue>4-5</issue>
    <volume>71</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation>Bundesanstalt für Materialforschung und -prüfung</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2020-04-16</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Experimental and numerical simulation of material and damage behaviour of 3d printed polyamide 12 under quasi-static-loading</title>
    <abstract language="eng">In order to characterise the material and damage behaviour of additively manufactured polyamide 12 (PA12) under quasi-static load and to implement it in a numerical model, experiments under quasi-static load as well as microstructural investigations were carried out. Selective laser sintering (SLS) was used as the manufacturing process. For the classification of the material behaviour, quasi-static cyclic tests with holding times as well as tensile tests were performed. X-ray refraction and computed tomography (CT) were used to investigate the damage behaviour. The Chaboche model, which has already been applied for metallic materials under thermomechanical loading, served as the basis for the selection of the numerical material model. The same procedure was used for the selection of the damage model, where the Gurson–Tvergaard–Needleman (GTN) model was chosen, which was already used for porous metallic materials. The Chaboche model shows very good agreement with experimental results. Furthermore, the coupling with the GTN model allows a very good modelling of the damage behaviour. Finally, it could be shown that the selected models are suitable to simulate the material and damage behaviour of 3D printed PA12.</abstract>
    <parentTitle language="eng">Archives of Mechanics</parentTitle>
    <identifier type="doi">10.24423/aom.3162</identifier>
    <identifier type="url">https://am.ippt.pan.pl/am/article/viewFile/v71p507/pdf</identifier>
    <identifier type="issn">0373-2029</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <author>
      <firstName>Daniela</firstName>
      <lastName>Schob</lastName>
    </author>
    <submitter>
      <firstName>Daniela</firstName>
      <lastName>Schob</lastName>
    </submitter>
    <author>
      <firstName>Robert</firstName>
      <lastName>Roszak</lastName>
    </author>
    <author>
      <firstName>Ilja</firstName>
      <lastName>Sagradov</lastName>
    </author>
    <author>
      <firstName>Holger</firstName>
      <lastName>Sparr</lastName>
    </author>
    <author>
      <firstName>Andreas</firstName>
      <lastName>Kupsch</lastName>
    </author>
    <author>
      <firstName>Fabien</firstName>
      <lastName>Leonard</lastName>
    </author>
    <author>
      <firstName>Bernd R.</firstName>
      <lastName>Müller</lastName>
    </author>
    <author>
      <firstName>Giovanni</firstName>
      <lastName>Bruno</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Polyamide 12</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>3D printing</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Viscoplastic</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Chaboche model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Damage</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>GTN model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>X-ray refraction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Computed tomography</value>
    </subject>
    <collection role="institutes" number="3305">FG Technische Mechanik und Maschinendynamik</collection>
  </doc>
  <doc>
    <id>25588</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>66</pageFirst>
    <pageLast>76</pageLast>
    <pageNumber/>
    <edition/>
    <issue>1</issue>
    <volume>40</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2020-04-16</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Thermo-viscoplastic material modelling for self-heating loads and its experimental verification</title>
    <abstract language="eng">The paper examines a modelling approach for thermomechanically coupled problems and an experimental concept for a material law validation and verification for self-heating with small to moderate temperature ranges. The study compares two different model formulations and is generally applicable to a variety of material classes. One model is based on a rheological network with an extension for dissipative deformation below the elastic limit. The other model operates without a yield condition. Both models are applied to published experimental data in terms of rate-independent behaviour and the evaluation is carried out on stress-strain-level, temperature evolution and the energy transformation ratio. Furthermore the two models are applied to a strain rate-dependent load case conducted at our institute discussing the same entities. It is pointed out, that the approach of a thermomechanical analysis is valuable and informative to assess the observed deformation processes and to describe the material behaviour with a thermodynamically valid parameter set.</abstract>
    <parentTitle language="eng">Technische Mechanik</parentTitle>
    <identifier type="doi">10.24352/UB.OVGU-2020-015</identifier>
    <identifier type="issn">2199-9244</identifier>
    <identifier type="issn">0232-3869</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</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>Holger</firstName>
      <lastName>Sparr</lastName>
    </author>
    <submitter>
      <firstName>Daniela</firstName>
      <lastName>Schob</lastName>
    </submitter>
    <author>
      <firstName>Robert</firstName>
      <lastName>Roszak</lastName>
    </author>
    <author>
      <firstName>Ilja</firstName>
      <lastName>Sagradov</lastName>
    </author>
    <author>
      <firstName>Daniela</firstName>
      <lastName>Schob</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>viscoplasticity</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>energy transformation ratio</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>thermography</value>
    </subject>
    <collection role="institutes" number="3305">FG Technische Mechanik und Maschinendynamik</collection>
  </doc>
  <doc>
    <id>25589</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>13</pageNumber>
    <edition/>
    <issue/>
    <volume>229</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation>Bundesanstalt für Materialforschung und -prüfung</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2020-04-16</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Experimental determination and numerical simulation of material and damage behaviour of 3d printed polyamide 12 under cyclic loading</title>
    <abstract language="eng">The material and damage behaviour of additively manufactured polyamide 12 under cyclic loading was characterized by cyclic tests and microstructure analysis by using microscopy, X-ray refraction, and computed tomography. The results were used to determine parameters for the viscoplastic material model by Chaboche and a damage model by Gurson-Tvergaard-Needleman. The temperature was monitored during the experiments and the self-heating effect was observed. By including this effect, a higher accuracy could be achieved with the results of mechanical experiments.</abstract>
    <parentTitle language="eng">Engineering Fracture Mechanics</parentTitle>
    <identifier type="doi">10.1016/j.engfracmech.2019.106841</identifier>
    <identifier type="issn">0013-7944</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Artikelnummer">106841</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</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>Ilja</firstName>
      <lastName>Sagradov</lastName>
    </author>
    <author>
      <firstName>Robert</firstName>
      <lastName>Roszak</lastName>
    </author>
    <author>
      <firstName>Holger</firstName>
      <lastName>Sparr</lastName>
    </author>
    <author>
      <firstName>Rainer</firstName>
      <lastName>Franke</lastName>
    </author>
    <author>
      <firstName>Matthias</firstName>
      <lastName>Ziegenhorn</lastName>
    </author>
    <author>
      <firstName>Andreas</firstName>
      <lastName>Kupsch</lastName>
    </author>
    <author>
      <firstName>Fabien</firstName>
      <lastName>Leonard</lastName>
    </author>
    <author>
      <firstName>Bernd R.</firstName>
      <lastName>Müller</lastName>
    </author>
    <author>
      <firstName>Giovanni</firstName>
      <lastName>Bruno</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>3D printing Polyamide 12</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Chaboche model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>GTN model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Material and damage behaviour</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>X-ray refraction</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>computed tomography</value>
    </subject>
    <collection role="institutes" number="3305">FG Technische Mechanik und Maschinendynamik</collection>
  </doc>
  <doc>
    <id>26349</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>8</pageNumber>
    <edition/>
    <issue/>
    <volume>25</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2020-11-13</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Experimental investigation and numerical modelling of 3D printed polyamide 12 with viscoplasticity and a crack model at different strain rates</title>
    <abstract language="eng">This contribution presents an investigation of strain rate dependent behaviour for selective laser sintered polyamide 12. Two different cases are considered: a strain rate change within tensile loading and a relaxation test incorporating a strain rate change after each holding time section. For the simulation of material behaviour the material model of Bodner-Partom and Chaboche were used. The damage behaviour was considered by the Lemaitre crack model. Thereby it was determined which numerical model is more suitable to reproduce the strain rate-dependent behaviour. Tensile and relaxation tests at constant speeds served as the basis for these investigations.</abstract>
    <parentTitle language="eng">Materials Today Communications</parentTitle>
    <identifier type="doi">10.1016/j.mtcomm.2020.101542</identifier>
    <identifier type="url">https://www.sciencedirect.com/science/article/abs/pii/S2352492820325538</identifier>
    <identifier type="issn">2352-4928</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Artikelnummer">101542</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>Ilja</firstName>
      <lastName>Sagradov</lastName>
    </author>
    <submitter>
      <firstName>Ilja</firstName>
      <lastName>Sagradov</lastName>
    </submitter>
    <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>Holger</firstName>
      <lastName>Sparr</lastName>
    </author>
    <author>
      <firstName>Matthias</firstName>
      <lastName>Ziegenhorn</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>SLS-PA12</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Rate-dependent Chaboche model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Bodner-Partom model</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Lemaitre</value>
    </subject>
    <collection role="institutes" number="3305">FG Technische Mechanik und Maschinendynamik</collection>
  </doc>
</export-example>
