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Development Of Stab Resistant Sandwich Fabric
Project Description :

Stab resistance is garnering a lot of attention in india lately. stab, slash and poach proof vests are the need of the moment. we’ve pre existing standards based on the amount of penetration achieved by the drop test, at different levels or ranges of energy levels for the classification of the same. this work in this study is done with a motive to develop a sandwich fabric consisting of high strength and modulus fabrics like kevlar, basalt and multi axial glass fabric. variegated combinations of these fabrics have been created and studied to check their performance during time of attack, amount of notching, penetration etc. basalt twill woven fabric, e- glass multilayer fabric and para- aramid spun woven twill fabrics of high gsm’s have been employed here to get better performance at the time of stabbing than pre-existing materials. the multilayer fabric is used because has different directional orientation in each layer providing better resistance to stabs coming from different directions. either a single or 2 layers of para – aramid have been employed in each sample so provide better wearability since glass fabric is very uncomfortable otherwise and basalt fabric is very flimsy in nature, the para- aramid does the work of holding all the layers together and nullifying the cons of the other two fabrics with regard to wearability. all the individual fabrics were assessed before they were chosen and certified to be used as a part of the sandwich fabrics. the combinations consist of 8 layers of fabric each which have been stitched together by diamond stitching and selvedge locking process. each sandwich of a4 size about 100 to 200 grams and is about 5 mm thick. multiple duplicates of these 10 prototypes of stab proof sandwiches were made based on carefully formulated combinations and tested. each different composition is described in detail in the report. an assessment of all these combinations isn’t over completely yet and is presently in process; but the efficiency and competency of the fabric has been sufficiently proven through simulated human stab setting and testing performed on the samples which was conducted at different angles of stabbing. this was done by calculating the amount of energy expended on the sample which was done with the help of readings acceleration through the stab process, velocity at the end of stab and maximum force during the stab. penetration after stab and time required for one complete stab was also recorded. it was judged that the sample will be able to sustain at least close to 50 joule energy. it has also been ascertained before that the majority of the human sample space consisting of commoners exerts energy below 50 joule. the penetration observed at these energy levels was minimal to 0%. puncture testing was also carried out on the samples and it was observed that the samples puncture at loads greater than 750 kgs.

 
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Project Details :
  • Date : Oct 17,2017
  • Innovator : Aparna Nerurkar
  • Guide Name : Dr. Hireni Mankodi
  • University : Maharaja Sayajirao University of Baroda
  • Submission Year : 2018
  • Category : Textile
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