The plastic deformation of fibrous polymers via Weibull model

This work deals with the plastic deformation of polypropylene, PAN-based ca rbon and Kevlar fibres at different gauge lengths and uses the Weibull mode l. A statistical analysis for the fibre strength and breaking strain is pre sented to test the experimental data relating to the fibre deformation. The mechanical parameters such as fibre strength, breaking strain and Young's modulus have been studied as a function of gauge length. It was found that both strength and breaking strain increase as fibre gauge length decreases, while the Young's modulus increases with increasing gauge length and depen ds on both strength and breaking strain. The output of the analysis support s the concept that the Weibull model is a good technique to specify the sta tistical distribution for strength and breaking strain of fibres and of sui table to investigate, is the deformation behaviour of fibrous polymeric mat erials in general.