Viskoelastizität und Anisotropie von Kunststoffen: Ultraschallbasierte Methoden zur Materialparameterbestimmung

In this paper, a method for the characterisation of orthotropic, plate-shaped material samples is presented. Ultrasonic plate waves are excited at different angles and then detected. Then, a two-dimensional simulation model can be used to inversely estimate a set of material parameters for each angle of propagation. After merging these individual results into a global set of parameters, the material’s elastic behaviour can be described for arbitrary load directions. The procedure is exemplarily applied to characterise continuous-fibre reinforced polymers.

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An acoustic waveguide-based approach to the complete characterisation of linear elastic, orthotropic material behaviour

Johannesmann

Düchting

Webersen

et al. 2018

Tm - Technisches Messen

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Impurity detection in polymer parts for the semiconductor manufacturing industry

Moldaschl

Arnold

Zauner

et al. 2018

Tm - Technisches Messen

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The very strict purity requirements of polymer parts that are used in the semiconductor manufacturing industry lead to an excessively low yield rate. To decrease the costs in the production chain, detailed knowledge about possible impurities during each processing step is essential. This work provides an overview of non-destructive testing techniques that are capable of either detecting or even identifying these impurities. The most promising techniques were then combined in a semi-automatized laboratory demonstrator that can be used as an in-line diagnostics tool to prevent processing of faulty parts. Results from these measurements are presented and discussed.

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Experimental Characterization of the Mechanical Properties of Filter Media in Solid–Liquid Filtration Processes

Puderbach,

Kirsch,

Antonyuk

2024

Materials

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Nonwoven filter media are used in many industrial applications due to their high filtration efficiency and great variety of compositions and structures which can be produced by different processes. During filter operation in the separation process, the fluid flow exerts forces on the filter medium which leads to its deformation, and in extreme cases damage. In order to design or select a reliable filter medium for a given application, it is essential to have a comprehensive understanding of the mechanical properties of the nonwoven material. In general, the properties of the filter material are influenced by temperature and can be changed during loading due to irreversible deformation, fatigue, and aging processes. In order to gain a deeper comprehension, the presented study examines the influence of temperature and repeated tensile stress on the filter medium properties. The focus is on fuel and oil filters employed in automotive applications. The characteristic properties of the samples, including thickness, porosity, and permeability as well as Young’s modulus and Poisson’s number, are measured. Young’s modulus is determined for both new and aged samples. In addition, the viscoelastic behavior is investigated via a dynamic mechanical thermal analysis. The results demonstrate a significant dependence of mechanical properties on the material composition and the aging effects.

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Viskoelastizität und Anisotropie von Kunststoffen: Ultraschallbasierte Methoden zur Materialparameterbestimmung

Cited by 3 publications

References 24 publications

An acoustic waveguide-based approach to the complete characterisation of linear elastic, orthotropic material behaviour

An acoustic waveguide-based approach to the complete characterisation of linear elastic, orthotropic material behaviour

Impurity detection in polymer parts for the semiconductor manufacturing industry

Experimental Characterization of the Mechanical Properties of Filter Media in Solid–Liquid Filtration Processes

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