How Nonlinear Viscoelastic Matrix Behavior Influences Interfacial Shear Strength Measurements

Published

July 30, 1999

Author(s)

Gale A. Holmes, Donald L. Hunston, Walter G. McDonough, R C. Peterson

Abstract

Precise measurements of fiber break regions formed during the single fiber fragmentation testing procedure indicate that the calculated interfacial shear strength (IFSS) or the interfacial shear stress transfer coefficient (I-STC) is dependent on the testing protocol. E-glass/diglycidyl ether of bisphenol-A (DGEBA)/meta-phenylenediamine (m-PDA) single fiber fragmentation test (SFFT) specimens were found to be more sensitive that E-glass/polyisocyanurate SFFT specimens. For E-glass/DGEBA/m-PDA SFFT specimens, the change in fiber fragment distribution with testing protocol was found to be inconsistent with the effect expected when one only considers the nonlinear viscoelastic behavior of the matrix. These results are interpreted in terms of failure of the fiber matrix interface during the testing procedure.

Proceedings Title

Fourth International Conference on Constitutive Laws for Engineering Materials

Conference Dates

July 27-30, 1999

Conference Location

Troy, NY

Pub Type

Conferences

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Keywords

E-glass fibers, epoxy resin, fiber fragmentation, interface, interphase, nonlinear viscoelasticity, polyisocyanurate resin

Citation

Holmes, G. , Hunston, D. , McDonough, W. and Peterson, R. (1999), How Nonlinear Viscoelastic Matrix Behavior Influences Interfacial Shear Strength Measurements, Fourth International Conference on Constitutive Laws for Engineering Materials, Troy, NY, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851555 (Accessed October 1, 2025)