Experimental Investigation of Damage Formation in Planar Fibrous Networks During Stretching

Evelin Sipos,Tatsuo Kaneko,Miklós Zrinyi

doi:10.1038/s41598-019-39460-3

Evelin Sipos, Tatsuo Kaneko + Show 1 more

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https://doi.org/10.1038/s41598-019-39460-3

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Abstract

This paper presents the results of unidirectional strain-controlled experiments on fibrous electrospun networks used to study damage formation during elongation. The experimental loading curve shows a symmetrical parabolic type dependence at large scale and saw tooth-like force−extension behaviour at small scale. The damage formation was quantified by determining the number and the magnitude of abrupt force drops. The experiments evidenced that damage evolution is a consequence of strain induced random events. The frequency distribution of the number of damages as well as the magnitude of rupture force were represented by histograms. The results of the present study provide a better insight into damage tolerance and complex nonlinear tensile properties of electrospun networks. In addition, it could suggest a possible probabilistic approach to the fiber bundle model which has mainly motivated this study.

Highlights

An experimental technique has been proposed to study the effect of material damage on the stress–strain behaviour of weak, planar electrospun fibre networks
The results of strain controlled mechanical experiments showed saw tooth-like force−extension behaviour at short scale and maximum parabolic type loading curve dependence at large scale. This complex, nonlinear stress-strain behaviour is a consequence of rupture of fibres during extension
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Summary

Fibrous Networks During

This paper presents the results of unidirectional strain-controlled experiments on fibrous electrospun networks used to study damage formation during elongation. The main purpose of the present study is to perform experiments that compare short scale damage formation with the loading curve and to provide experimental results for a possible probabilistic approach to the FBM. This model envisages a material as a set of N parallel fibres clamped at one end, with an external load applied at the other end. All the stress-strain measurements were conducted at room temperature at a rate of elongation of 0.5 mm/min

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