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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Holistic structural analysis of polymeric foam systems
https://orcid.org/0000-0002-1123-2371
Highlights PUR foams are non-linear-elastic quasi-brittle with positive post-peak behavior. Structural foam systems of XPS, EPP, and PUR reveal high anisotropy. XPS foams are evaluated indicating adverse orientation effects (anisotropy). EPS and PUR foams indicate positive size effects. The GF method seems suitable to characterize the damage effects of polymeric foams.
Abstract In the construction industry, materials with density advantages are becoming increasingly prevalent due to the trend toward lightweight construction. These include, above all, synthetic foams based on polyurethane and polypropylene. While they are mainly used for thermal insulation during thermal refurbishment, they are also increasingly being used for structural tasks. On the part of manufacturers, these are still dominated by standardized mechanical test methods such as compression or flexure tests. However, the major drawback of these strength tests is the need for more information about the structural failure behavior of polymer foams in the fracture zone itself, the interface. Since fracture analytical approaches provide only limited vital figures, this work presents a holistic approach that encompasses all areas of evaluation. This influences sample size, orientation (isotropy), fracture zone effects (failure patterns), and structural safety. Common synthetic polymer foam systems (open-cell and closed-cell) are used to represent the broadest possible range of evaluation. The results show that it is not the materials with the highest tensile strength that are most convincing, but those with the most extraordinary fracture energy and damage tolerance. The practical information greatly expands the selection options for decision-makers since technical data sheets from manufacturers can only be used to a limited extent.
Holistic structural analysis of polymeric foam systems
https://orcid.org/0000-0002-1123-2371
Highlights PUR foams are non-linear-elastic quasi-brittle with positive post-peak behavior. Structural foam systems of XPS, EPP, and PUR reveal high anisotropy. XPS foams are evaluated indicating adverse orientation effects (anisotropy). EPS and PUR foams indicate positive size effects. The GF method seems suitable to characterize the damage effects of polymeric foams.
Abstract In the construction industry, materials with density advantages are becoming increasingly prevalent due to the trend toward lightweight construction. These include, above all, synthetic foams based on polyurethane and polypropylene. While they are mainly used for thermal insulation during thermal refurbishment, they are also increasingly being used for structural tasks. On the part of manufacturers, these are still dominated by standardized mechanical test methods such as compression or flexure tests. However, the major drawback of these strength tests is the need for more information about the structural failure behavior of polymer foams in the fracture zone itself, the interface. Since fracture analytical approaches provide only limited vital figures, this work presents a holistic approach that encompasses all areas of evaluation. This influences sample size, orientation (isotropy), fracture zone effects (failure patterns), and structural safety. Common synthetic polymer foam systems (open-cell and closed-cell) are used to represent the broadest possible range of evaluation. The results show that it is not the materials with the highest tensile strength that are most convincing, but those with the most extraordinary fracture energy and damage tolerance. The practical information greatly expands the selection options for decision-makers since technical data sheets from manufacturers can only be used to a limited extent.
Holistic structural analysis of polymeric foam systems
https://orcid.org/0000-0002-1123-2371
Highlights PUR foams are non-linear-elastic quasi-brittle with positive post-peak behavior. Structural foam systems of XPS, EPP, and PUR reveal high anisotropy. XPS foams are evaluated indicating adverse orientation effects (anisotropy). EPS and PUR foams indicate positive size effects. The GF method seems suitable to characterize the damage effects of polymeric foams.
Abstract In the construction industry, materials with density advantages are becoming increasingly prevalent due to the trend toward lightweight construction. These include, above all, synthetic foams based on polyurethane and polypropylene. While they are mainly used for thermal insulation during thermal refurbishment, they are also increasingly being used for structural tasks. On the part of manufacturers, these are still dominated by standardized mechanical test methods such as compression or flexure tests. However, the major drawback of these strength tests is the need for more information about the structural failure behavior of polymer foams in the fracture zone itself, the interface. Since fracture analytical approaches provide only limited vital figures, this work presents a holistic approach that encompasses all areas of evaluation. This influences sample size, orientation (isotropy), fracture zone effects (failure patterns), and structural safety. Common synthetic polymer foam systems (open-cell and closed-cell) are used to represent the broadest possible range of evaluation. The results show that it is not the materials with the highest tensile strength that are most convincing, but those with the most extraordinary fracture energy and damage tolerance. The practical information greatly expands the selection options for decision-makers since technical data sheets from manufacturers can only be used to a limited extent.
Holistic structural analysis of polymeric foam systems
Brandtner-Hafner, Martin (Autor:in)
15.01.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Holistic structural analysis of polymeric foam systems
| Elsevier | 2023
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