ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 6 May 2011
Page Count: 18

Size Effect Related to Composite Toughness Characterization

Yotte, Sylvie
I2M, Department Environmental Civil Engineering, Bordeaux University, UMR 5295, Domaine Universitaire, Talence cedex,

Breysse, Denys
I2M, Department Environmental Civil Engineering, Bordeaux University, UMR 5295, Domaine Universitaire, Talence cedex,

(Received 19 January 2009; accepted 11 April 2011)

Abstract

This paper deals with toughness characterization of composite materials. In that case, Linearly Elastic Fracture Mechanics (LEFM) may not be effective because a damage zone develops at the notch tip during crack propagation. Experimental tests were carried out on two different series of homothetic specimens (Single Edge Notched Tensile and Steel Frame Assisted Tension). Data gathered for the tested sample sizes confirmed that LEFM cannot be used for toughness characterization. A macroscopic failure criterion was hence derived from experimental data. Acoustic emission data indicated fiber bridging as the main mechanism opposing crack propagation. The corresponding microscopic failure criterion is chosen to define a test-independent criterion. Cumulative statistical distributions of test-independent failure parameters were finally determined on the basis of all experimental results.

Keywords:
layered structures, fracture toughness, mechanical testing, size effect, characterization

Paper ID: JAI102337
DOI: 10.1520/JAI102337
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