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Measurements of the elastic modulus of moulding compounds by a resonance method
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis the possibility is investigated to adapt the impulse excitation technique to measurements of the elastic modulus of highly filled moulding compounds used in the semi-conductor industry. The impulse excitation technique is a fast and precise method and works non-destructively. It consists of exciting a sample mechanically and measuring the resonance frequency from which one can calculate the elastic modulus. The reproducibility of the method was investigated and results from the impulse excitation technique are compared with results from three-point bending measurements on the same moulding compound samples. The moisture dependence of the elastic modulus was investigated. The samples were soaked at 85ºC and 85% relative humidity and pressure cooker at 121ºC and 2 bar. A decreasing of the elastic modulus due to increasing water content was observed. The preciseness of the method allowed to detect even differences between moulding compounds. In order to separate a possible influence of the temperature alone, dry conditioning at 85ºC was performed additionally. Reasons for differences and behaviour of the results are discussed. Furthermore a setup for online temperature dependent elastic modulus measurements was constructed. Online temperature dependent measurements, up to 240ºC, were performed and gave reproducible values. At the glass transition temperature the method was not applicable and gave no reasonable results. The problem that was encountered was additional noise inside the oven that was picked up by the instrument used.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Impulse excitation technique
Keyword [sv]
URN: urn:nbn:se:ltu:diva-52013ISRN: LTU-EX--01/149--SELocal ID: 92b82650-8a28-4ea4-ab94-46e3800c5d66OAI: diva2:1025379
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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