Assigned Session: FS 3.237: Open Poster Session
Properties and behavior of additively manufactured polymer objects in alpine environments
Abstract ID: 3.12758 | Accepted as Poster | Poster | TBA | TBA
Bernarda Keßler (0)
Brockschmidt, Sophia, Schafferer, Martin, Mandl, Bernhard, Schmiedinger, Thomas
Bernarda Keßler ((0) University of Applied Sciences Kufstein, Andreas Hofer-Straße 7, 6330, Kufstein, Tirol, AT)
Brockschmidt, Sophia, Schafferer, Martin, Mandl, Bernhard, Schmiedinger, Thomas
(0) University of Applied Sciences Kufstein, Andreas Hofer-Straße 7, 6330, Kufstein, Tirol, AT
(1) University of Applied Sciences Kufstein, Andreas Hofer-Straße 7, 6330, Kufstein, Austria
(1) University of Applied Sciences Kufstein, Andreas Hofer-Straße 7, 6330, Kufstein, Austria
BACKGROUND
Materials and components that are used in alpine regions are exposed to extreme environmental conditions such as sub-zero temperatures and high humidity. These factors influence the mechanical properties of the materials and can significantly impair their long-term use.
OBJECTIVES
The aim of this work is to investigate the mechanical properties and behavior of additively manufactured polymer objects in different temperature ranges. Based on the knowledge gained, it should be possible to select materials that are suitable for long-term use under difficult conditions.
METHODS
The present work focusses on the investigation of three materials: acrylonitrile-styrene-acrylate (ASA), polylactide (PLA) and polyethylene terephthalate, glycol-modified (PET-G). Standardized test specimens were produced under reproducible conditions using additive manufacturing. Some of the samples were stored in demineralized water at a constant 20°C for 168 hours (1 week). All samples were then subjected to tensile testing at -17°C, 0°C and +21°C.
RESULTS
It was found that the water absorption for the materials analyzed differed greatly in some cases, with PET-G showing the highest water absorption. With decreasing temperatures, a tendency towards increasing tensile strength was observed. The evaluation of the modulus of elasticity at different temperatures showed only minor changes. Differences were mainly found in comparison to the values given in the data sheets, with PET-G also showing the greatest changes here.
CONCLUSION
Additive manufacturing offers a wide range of possibilities for designing housings, brackets and connecting elements. By selecting suitable materials, resource-saving production can also be realized.
Two key statements that can be made are
– Low temperatures (-17°C) have no negative influence on tensile strength.
– The choice of material should depend on the requirements, i.e. ASA should be chosen for structurally stressed components (e.g. brackets for weather stations) and PLA for the housing (due to the lower water absorption).
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