Abstract
The performance of bulletproof vests is mainly based on the energy absorption capacity of the flexible fibrous reinforcements. To understand the in situ behaviour of these textile structures during a ballistic impact, we find the use of sensor yarns integrated into these fibrous reinforcements to be a non-invasive and reliable solution. Measurements of the dynamic deformation of the sensor yarns will provide a new and useful source of information. The design and manufacturing stages of a sensor yarn, made with the same structural yarns of the fabric, are detailed successively. Then, different batches of sensor yarns were designed, and electromechanical tensile tests were performed in quasi-static mode. These experiments provide encouraging results for the measurement of the deformation of a textile structure subject to a dynamic impact.
Highlights
Textile structures can be used as a flexible protection solution alone, for low-speed protective level ammunition (NIJ II to IIIA standard) or fragment simulating projectile (FSP) (STANAG 2920 standard), or coupled with very rigid materials, metallic or ceramic, for personal protection from high-speed STANAG 2920 level ammunition or FSP (STANAG 2920)
We focus on the mechanical behaviour at each stage, allowing the realisation of the sensor, namely, on the sensor substrate (Virgin Twaron® yarns—virgin Twaron® yarns (VTY)), when adding the pre-coating of PVA (PVA-TVY), when adding the wrapped connections (CO-PVA-TVY), and when adding the three or eight piezoresistive coating layers (3-CleviosTM F020 (CF020)-CO-PVA-TVY and 8-CF020-CO-PVA-TVY, respectively)
This paper focused on the realisation of piezoresistive sensors made from the same structural yarns of the fabric
Summary
Textile structures can be used as a flexible protection solution alone (bullet-proof vest), for low-speed protective level ammunition (NIJ II to IIIA standard) or fragment simulating projectile (FSP) (STANAG 2920 standard), or coupled with very rigid materials, metallic or ceramic, for personal protection from high-speed STANAG 2920 (or NIJ IV to V) level ammunition or FSP (STANAG 2920). During ballistic tests using conventional ammunition, impacts by FSPs or shock waves resulting from an explosive charge (or sometimes a combination of the two), X-ray, or high-speed camera means can be used to observe the dynamic deformation modes of the multi-layer woven protective structure [5]. These measuring instruments do not allow for the observation of precisely the in situ dynamic behaviour of the fibre reinforcement within the textile structure. Depending on the accuracy and complexity of the numerical models used, the dynamic deformations of the yarns inserted into a woven structure are more or less faithfully represented [8,9]
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