Efficiency of the Needle Probe Test for Evaluation of Thermal Conductivity of Composite Materials: Two-Scale Analysis
The needle probe test, as a thermal conductivity measurement method, has become very popular in recent years. In the present study, the efficiency of this methodology, for the case of composite materials, is investigated based on the numerical simulations. The material under study is a two-phase com...
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| Format: | Article |
| Language: | English |
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Sciendo
2014-03-01
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| Series: | Studia Geotechnica et Mechanica |
| Subjects: | |
| Online Access: | http://www.degruyter.com/view/j/sgem.2014.36.issue-1/sgem-2014-0007/sgem-2014-0007.xml?format=INT |
| _version_ | 1819092489652404224 |
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| author | Łydżba Dariusz Różański Adrian Rajczakowska Magdalena Stefaniuk Damian |
| author_facet | Łydżba Dariusz Różański Adrian Rajczakowska Magdalena Stefaniuk Damian |
| author_sort | Łydżba Dariusz |
| collection | DOAJ |
| description | The needle probe test, as a thermal conductivity measurement method, has become very popular in recent years. In the present study, the efficiency of this methodology, for the case of composite materials, is investigated based on the numerical simulations. The material under study is a two-phase composite with periodic microstructure of “matrix-inclusion” type. Two-scale analysis, incorporating micromechanics approach, is performed. First, the effective thermal conductivity of the composite considered is found by the solution of the appropriate boundary value problem stated for the single unit cell. Next, numerical simulations of the needle probe test are carried out. In this case, two different locations of the measuring sensor are considered. It is shown that the “equivalent” conductivity, derived from the probe test, is strongly affected by the location of the sensor. Moreover, comparing the results obtained for different scales, one can notice that the “equivalent” conductivity cannot be interpreted as the effective one for the composites considered. Hence, a crude approximation of the effective property is proposed based on the volume fractions of constituents and the equivalent conductivities derived from different sensor locations. |
| first_indexed | 2024-12-21T22:56:26Z |
| format | Article |
| id | doaj.art-070176b7aa09422eaae291098df8b0a3 |
| institution | Directory Open Access Journal |
| issn | 0137-6365 2083-831X |
| language | English |
| last_indexed | 2024-12-21T22:56:26Z |
| publishDate | 2014-03-01 |
| publisher | Sciendo |
| record_format | Article |
| series | Studia Geotechnica et Mechanica |
| spelling | doaj.art-070176b7aa09422eaae291098df8b0a32022-12-21T18:47:25ZengSciendoStudia Geotechnica et Mechanica0137-63652083-831X2014-03-01361556210.2478/sgem-2014-0007sgem-2014-0007Efficiency of the Needle Probe Test for Evaluation of Thermal Conductivity of Composite Materials: Two-Scale AnalysisŁydżba Dariusz0Różański Adrian1Rajczakowska Magdalena2Stefaniuk Damian3Institute of Geotechnics and Hydrotechnics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, PolandInstitute of Geotechnics and Hydrotechnics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, PolandInstitute of Geotechnics and Hydrotechnics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, PolandInstitute of Geotechnics and Hydrotechnics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, PolandThe needle probe test, as a thermal conductivity measurement method, has become very popular in recent years. In the present study, the efficiency of this methodology, for the case of composite materials, is investigated based on the numerical simulations. The material under study is a two-phase composite with periodic microstructure of “matrix-inclusion” type. Two-scale analysis, incorporating micromechanics approach, is performed. First, the effective thermal conductivity of the composite considered is found by the solution of the appropriate boundary value problem stated for the single unit cell. Next, numerical simulations of the needle probe test are carried out. In this case, two different locations of the measuring sensor are considered. It is shown that the “equivalent” conductivity, derived from the probe test, is strongly affected by the location of the sensor. Moreover, comparing the results obtained for different scales, one can notice that the “equivalent” conductivity cannot be interpreted as the effective one for the composites considered. Hence, a crude approximation of the effective property is proposed based on the volume fractions of constituents and the equivalent conductivities derived from different sensor locations.http://www.degruyter.com/view/j/sgem.2014.36.issue-1/sgem-2014-0007/sgem-2014-0007.xml?format=INTthermal conductivitycompositeperiodic microstructurehomogenization |
| spellingShingle | Łydżba Dariusz Różański Adrian Rajczakowska Magdalena Stefaniuk Damian Efficiency of the Needle Probe Test for Evaluation of Thermal Conductivity of Composite Materials: Two-Scale Analysis Studia Geotechnica et Mechanica thermal conductivity composite periodic microstructure homogenization |
| title | Efficiency of the Needle Probe Test for Evaluation of Thermal Conductivity of Composite Materials: Two-Scale Analysis |
| title_full | Efficiency of the Needle Probe Test for Evaluation of Thermal Conductivity of Composite Materials: Two-Scale Analysis |
| title_fullStr | Efficiency of the Needle Probe Test for Evaluation of Thermal Conductivity of Composite Materials: Two-Scale Analysis |
| title_full_unstemmed | Efficiency of the Needle Probe Test for Evaluation of Thermal Conductivity of Composite Materials: Two-Scale Analysis |
| title_short | Efficiency of the Needle Probe Test for Evaluation of Thermal Conductivity of Composite Materials: Two-Scale Analysis |
| title_sort | efficiency of the needle probe test for evaluation of thermal conductivity of composite materials two scale analysis |
| topic | thermal conductivity composite periodic microstructure homogenization |
| url | http://www.degruyter.com/view/j/sgem.2014.36.issue-1/sgem-2014-0007/sgem-2014-0007.xml?format=INT |
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