Reference : Gradient of the Mechanical Modulus in Glass-Epoxy-Metal Joints as Measured by Brillou...

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics Engineering, computing & technology : Materials science & engineering
	To cite this reference:	http://hdl.handle.net/10993/13491

Title :	Gradient of the Mechanical Modulus in Glass-Epoxy-Metal Joints as Measured by Brillouin Microscopy.
Language :	English
Author, co-author :	Krüger, Jan-Kristian [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Possart, Wulff [Universität des Saarlandes]
	Bactavatchalou, R. [Laboratoire de Physique des Milieux Ionisés et Applications (LPMIA), Université de Nancy I, Vandoeuvre les Nancy, France]
	Müller, Ulrich [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Britz, Th [> >]
	Sanctuary, Roland [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
	Alnot, Patrick [> >]
Publication date :	2004
Journal title :	Journal of Adhesion
Publisher :	Taylor & Francis
Volume :	80
Issue/season :	7
Pages :	585-599
Peer reviewed :	Yes (verified by ORBilu)
ISSN :	0021-8464
Keywords :	[en] Epoxy ; Brillouin microscopy ; Mechanical modulus ; Epoxy-metal interphase
Abstract :	[en] The newly developed Brillouin microscopy is used for the first time to measure in situ the longitudinal elastic stiffness coefficient in the GHz-range inside of glass-epoxy-metal joints as a function of distance from the substrates. Interphases with a local variation of mechanical properties are quantitatively characterized. These interphases possess unexpected widths of tens to hundreds of microns. Inside the interphases, the spatial variation of the longitudinal stiffness coefficient depends on the type of substrate, on the curing conditions for the epoxy and probably on the distribution of internal stresses. The obtained spatial mechanical profiles provide valuable insight into the morphology-driven mechanics of the interphase, but additional information is needed for a full understanding of their physical and chemical origin. The presented results prove the sensitivity of the Brillouin microscopy; the elastic stiffness coefficients are detected with an accuracy in the subpercentage range. The spatial resolution is better than 10 µm.
Permalink :	http://hdl.handle.net/10993/13491
DOI :	10.1080/00218460490476973

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