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Title:On mechanical behavior and fracture morphology of epoxy resin
Author(s):Feltner, Charles E.
Fracture Morphology
Epoxy Resin
Abstract:Tensile specimens of irradiated and non-irradiated epoxy resin were broken by static loading using various strain rates and a study was made or the origin, development and characteristic patterns of the fracture surface markings. In nearly all cases fractures originated at inclusions or bubbles even when reasonable care was exercised in casting the resin. Epoxy resin exhibits three different types of stress-strain curve which have been termed normal, transition and premature. The slope of the stress-strain curve at fracture serves as an index of the degree of prematurity or normalcy of the fracture; positive and negative slopes being termed premature and normal, respectively. Examination of the corresponding fracture surfaces discloses that normal fractures are always accompanied by a considerable amount of slow crack extension while on the other hand little or no slow crack growth occurs in a premature fracture. Quantitatively, the relation between the fracture stress and the stable flaw size agrees reasonably well with the Griffith theory when the mirror is considered to be the Griffith flaw. Fractures started internally in some of the epoxy samples but at the edges of all the others. In most respects the characteristic features of a fracture surface of epoxy resin are similar to those of other polymers such as polymethyl methacrylate.
Issue Date:1962-08
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 224
Genre:Technical Report
Sponsor:U.S. Naval Research Laboratory, Contract No. Nonr 2947 (01)(X)
Rights Information:Copyright 1962 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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