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Effects of a composite-like stress state on the fracture of epoxies
Polymer Engineering, Luleå University of Technology.
Polymer Engineering, Luleå University of Technology.
KTH, Superseded Departments, Solid Mechanics.ORCID iD: 0000-0002-0307-8917
1995 (English)In: Composites Science And Technology, ISSN 0266-3538, Vol. 53, no 1, 27-37 p.Article in journal (Refereed) Published
Abstract [en]

The strain to failure of a transversely loaded composite is much lower than for the pure matrix in uniaxial tension. Several studies of composites suggest the triaxial matrix stress state as one of the explanations. In order to investigate this experimentally, a triaxial tensile test previously used for rubbers (the poker-chip test) was successfully applied to four epoxies in the glassy state. The chosen specimen geometry mimicked the most severe stress state in the matrix as determined by finite element analysis of a transversely loaded glass-fiber/epoxy composite. The poker-chip strains to failure in the primary loading direction were 0.5-0.8%, whereas uniaxial strains to failure were 1.8-7%. The triaxial stress state in composite matrices may therefore by itself be a sufficient explanation for low values of transverse composite strains to failure.

Place, publisher, year, edition, pages
1995. Vol. 53, no 1, 27-37 p.
Keyword [en]
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-25481DOI: 10.1016/0266-3538(94)00075-1ISI: A1995QQ12900005OAI: diva2:358738
QC 20101025Available from: 2010-10-25 Created: 2010-10-25 Last updated: 2010-10-25Bibliographically approved

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