Comparison of Thermal Maps with Damage Revealed by Silicone Impregnation

Heikki Kettunen, Atsushi Tanaka, Tatsuo Yamauchi

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Two different techniques are used to detect local straining and failure in order to study the fracture process in paper. Thermography is used to measure the local temperature variations. Ebeling has found that during the apparent elastic straining heat is absorbed by the specimen and during destraining heat is correspondingly generated. During the apparent plastic straining heat is generated irreversibly. Another technique, a silicone impregnation, reveals bond ruptures. It has been used to measure the extent of bond ruptures from the crack line in paper.

Two beating sets and two mixture sets of chemical and mechanical pulps were used to study fracture. In the in-plane tear test the shape of the FPZ measured by using the two detection techniques is similar. However, the area where temperature increases during the tear test is larger than the area of bond ruptures revealed by the silicone technique. This is consistent with Ebeling’s observation on heat generation during elastic destraining. The difference is used to evaluate the contribution of elastic recoil and plastic deformations on energy consumption in different samples.

The local temperature profiles ahead the crack tip are compared with damage profiles measured by using the silicone impregnation to analyze the process of fiber debonding. In addition, thermography is used to compare tensile fracture in the short span test with tear fracture. After the crack nucleation, the tensile fracture resembles crack propagation in the tearing.
Original languageEnglish
Title of host publicationProceedings, 2000 International Paper Physics
Subtitle of host publicationProgress in Paper Physics: A Seminar
EditorsJean-Francis Bloch
Pages119-120
Number of pages2
Volume1
Publication statusPublished - 2000
MoE publication typeNot Eligible
Event2000 International Paper Physics Seminar: Progress in Paper Physics - Ecole Française de Papeterie et des industries Graphiques, Grenoble, France
Duration: 11 Sep 200015 Sep 2000

Conference

Conference2000 International Paper Physics Seminar
CountryFrance
CityGrenoble
Period11/09/0015/09/00

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  • Cite this

    Kettunen, H., Tanaka, A., & Yamauchi, T. (2000). Comparison of Thermal Maps with Damage Revealed by Silicone Impregnation. In J-F. Bloch (Ed.), Proceedings, 2000 International Paper Physics: Progress in Paper Physics: A Seminar (Vol. 1, pp. 119-120)