On the strength and failure mechanism of woven para-aramid protection fabrics

What is it about?

In order to perform an in-depth analysis of the failure mechanism of woven para-aramid fabrics, the width of the specimens in this study is expressed in terms of the so-called “transverse inter-yarn nodal number”. This is the number of unit cell nodes on the trans- verse direction, which determine the width of the specimen. This paper reveals that the latter number is closely correlated with the weaving strength and the failure mechanism mode of the afore-mentioned fabrics under tensile loading. It was found that there are two possible failure mechanisms for woven para-aramid fabrics, an inter-yarn debonding (break of the unit cell nodal bonds and abruption of the fibers) and a fracture (break of the fibers) mode, whose presence in the failure mode depends on the transverse inter-yarn nodal number. In practice, there is a critical inter-yarn nodal number for each fabric, af- ter which a transition from debonding to fracture mechanism occurs. The afore-mentioned critical inter-yarn nodal number plays an important role on the strength of the fabric.

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Why is it important?

The present paper deals with a more detailed investigation of the woven para-aramid protection fabrics response, related to the inter-yarn interaction/bonding strength, which is an important indicator for the weaving strength, denotes the fabric quality, as well as in essence determines its mechanical response under several loading conditions. Tensile tests along 45 o of yarn orientation were carried out for specimens of different transverse inter-yarn nodal number , which determines the specimen’s width using the inter-yarn node as a unit width. The transverse nodal number is closely correlated with the failure mechanism mode under tensile loading. This study focuses on the effect of this number on the weaving strength and failure mechanism of woven para-aramid protection fabrics. It emerges that there are two possible failure mechanism forms in wo- ven para-aramid fabrics, an inter-yarn debonding (break of the unit cell nodal bonds and abruption of the fibers) and a fracture (break of the fibers) mechanism, whose presence in the failure mode depends on the transverse inter-yarn nodal number. In practice, there is a critical inter-yarn nodal number for each fabric after which a transition from debonding to fracture mechanism occurs. The importance of this critical nodal number is about its correlation with the strength of the fabric.