Modelling of Failure of Woven Composites. Part 2: Experimental and Numerical Justification of the Interzone Concept

Abstract

The failure of woven composites has been examined. This study is presented in two parts:-Modelling of failure of woven composites. Part 1: nomenclature defining the interzone concept; -Modelling of failure of woven composites. Part 2: experimental and numerical justification of the interzone concept.In the first part, the concepts of the interzone and the geometry of an interzone have been defined in a general way for a large panel of woven composites. In the second part, it has A. ThionnetAppl Compos Mater been shown that the failure of woven composites is well described by using the interzone concept. The load transfer between intact interzones and broken interzones has been evaluated for two types of loadings (tensile loading and loading in bending). The analysis of these load transfers explains why in the case of a tensile loading the failure is of a suddendeath type whereas in the case of bending loading the failure is progressive. The concept of failure of an interzone has been also defined.

In Situ tensile tests to analyze the mechanical response, crack initiation, and crack propagation in single polyamide 66 fibers

“…The second feature is the high aspect ratio of the structure: a fiber diameter is typically tens of micrometers, with monofilaments (MFs) for particular uses having diameters up to hundreds of microns, whereas fiber lengths can be up to several meters or virtually continuous, depending on applications. Thus, despite high tensile moduli, fibers as elementary mechanical structures are highly flexible and can easily be organized into complex multi‐assemblies like yarns or fabrics . In that context, the single fiber undergoes multiaxial mechanical loadings together with complex fiber–fiber frictional contacts …”

“…Thus, despite high tensile moduli, fibers as elementary mechanical structures are highly flexible and can easily be organized into complex multi-assemblies like yarns or fabrics. [4][5][6] In that context, the single fiber undergoes multiaxial mechanical loadings together with complex fiber-fiber frictional contacts. 7 From a fundamental point of view, as for all materials, the mechanical properties of the single fiber can be classified into two categories:…”