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We study the nucleation and development of crack patterns in thin compositefibers under tension in this work. A fiber comprises an elastic core and anouter layer of a weaker brittle material. In recent tensile experiments on suchcomposites, multiple cracks were observed to develop simultaneously on theouter layer. We propose here a simple one-dimensional model to predict suchphenomenon. We idealize the problem as two axially loaded rods coupled by alinear interfacial condition. The latter can be regarded as an adhesive thatresists slip between the two materials. One rod is modeled as a brittlematerial, and the other a linearly elastic material, both undergoing finitedeformations.

Nucleation and development of multiple cracks in thin composite fibers