Aceste veste sunt de obicei fabricate din fibre foarte polimerice foarte puternice cu greutate moleculară moleculară, cum ar fi Dyneema sau fibre puternice de aramid cum ar fi Kevlar
Armătura din corpul ceramic oferă o protecție deosebită, dar poate fi și dificil de fabricat, în special prin combinarea materialelor pentru a întări un compozit puternic
Odată cu avansarea în tehnologia armelor și apariția unor noi modele de gloanțe, soldații și ofițerii de aplicare a legii au nevoie de veste antiglonț mai avansate
Graphene Composites (GC) se apropie acum de ținta de finanțare a celei de-a patra campanii
Dar suspensiile vâscoase cu proprietăți de solidificare bruscă sunt de asemenea utilizate în alte scopuri; de exemplu, un producător american utilizează suspensii vâscoase pentru a dezvolta veste de siguranță împotriva glonțului și alungirilor. „Studiul nostru poate ajuta la îmbunătățirea acestor tipuri de aplicații”, spune Isa.
| Posted: May 02, 2018 | |
It all comes down to roughness(Nanowerk News) The internet is full of videos of people having fun running over white slime. It almost looks as if they were walking on water. But when they stand still, they slowly begin to sink. The slime in question is usually a concentrated suspension comprising cornstarch and water. Although colloquially known as „oobleck” after the children’s book by Dr Seuss, materials scientists use the term „non-Newtonian fluid”. In contrast to a „normal” (Newtonian) fluid, non-Newtonian fluids can become more viscous when acted upon by a large, rapidly changing force. For a brief moment, the material behaves like a solid. However, if the force is constant and weak, the material flows like a normal liquid. |
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| „This phenomenon appears in all suspensions with high particle density, such as cement,” says Lucio Isa, Professor of Interfaces, Soft matter and Assembly at ETH Zurich. If cement is pumped through a pipe on a construction site too quickly, the pipe will clog. | |
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| A thin suspension behaves like water: the ball sinks on impact. A thick suspension, on the other hand, solidifies abruptly on impact (right) (Image: Isa Group, ETH Zurich) | |
Higher friction due to rough surfaces |
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| This is partially due to the surface characteristics of the solid particles in the suspension. „If a force is applied suddenly,the solid particles are unable to move out of the way quickly enough. Instead, they come into contact, rubbing against and blocking each other”, Explains Isa. The rougher the particle surface, the higher the friction. | |
| Researchers use these properties to control the sudden increase in viscosity in a dense suspension in a targeted manner. Instead of cornstarch, Isa and his colleagues „played” with uniform, micrometre-sized silicate particles with a rough surface. The particles look like tiny raspberries and had already been used by the researchers in earlier studies. | |
| Chiao-Peng Hsu, a doctoral student working under Isa and ETH professor Nicholas Spencer, has developed a method that allows him to quickly generate a library of these raspberry-shaped particles with different surface roughnesses (PNAS, „Roughness-Dependent Tribology Effects on Discontinuous Shear Thickening”). | |
Higher viscosity despite fewer particles |
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| The researchers used these particles to create suspensions that they could test for sudden increases in viscosity under stress. The results showed that the rougher the particles, the fewer had to be added to the suspension to achieve sudden solidification. In contrast, if smooth particles were used, a greater amount had to be added to the suspension before the researchers were able to observe the sudden thickening. | |
| The researchers showed that the use of rough particles could save material: their portion of the total volume in a suspension can be substantially lower in order to generate the same effect. | |
| When the researchers mixed rough and smooth particles in a single suspension, solidification also occurred earlier than in suspensions with exclusively smooth particles. The ETH researchers discovered that as little as 6 percent of smooth particles in a mixture was enough to reduce the increase in viscosity significantly. „It’s like mixing up ball bearings and gearwheels,” says Isa. „The gearwheels link together relatively easily to create a stable chain but the ball bearings easily break those chains and enable flow .” | |
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| Rough and smooth particles in a suspension: Their mixing ratio influences the time of the sudden increase in viscosity. (Image: Chiao-Peng Hsu, ETH Zurich) | |
Growing „raspberries” on cantilevers |
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| In order to research the friction between individual particles, Hsu and his colleague Shivaprakash Ramakrishna attached a single, half-micrometre particle on a cantilever of an atomic force microscope. The researchers then moved the particle across various rough model surfaces by shifting the cantilever a few hundred nanometres while measuring the angle of tilt. The stronger the friction, the greater the angle. „Working with this kind of particle on a cantilever was extremely difficult, since the dimensions are incredibly small,” emphasises Hsu. „We were the first group to accomplish this.” | |
Applications in bullet-proof vests |
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| Whether the results will be integrated into real-life applications remains to be seen. The study is primarily pure research. „Our goal was to investigate the ways in which we can change nano and microstructures in order to influence material behaviour on a macroscopic level, and we succeeded,” says Isa. The findings could be used in everyday applications such as cement. „By adjusting the surfaces of granules and mixing them into cement in a similar way to our experiment, one could optimise cement’s flow characteristics.” | |
| But viscous suspensions with abrupt solidification properties are also used for other purposes; for example, an American manufacturer uses viscous suspensions to develop bullet and stab-proof safety vests. „Our study can help improve these kinds of applications,” says Isa. |
| Source: By Peter Rüegg, ETH Zurich | |
a inițiat cererea pentru această nouă vestă balistică inovatoare pentru marinari
În acest an, DR a obținut o primă privire la un prototip Condor Elite FLASH purtător de placă, pușcă și pistol mag ) pungi și pungi de accesorii combinate / tactice, realizate dintr-un material ultra-ușor pe care omul dvs. corespondent umil (pe care l-aș fi eu) le-a numit în mod extemperativ.Dar materialul FLASH nu este singurul aspect impresionant al sistemului. Prototipul purtătorului de plăci Condor Elite FLASH, pungile magice și pungile tactice de accesorii, toate arătau bine proiectate și construite. Suportul plăcii este foarte bine gândit și încorporează găuri de montare triunghiulare tăiate cu laser, care reprezintă cea mai recentă înlocuire / îmbunătățire pe MOLLE / PALS.
Last year, DefenseReview (DR) reported on the Condor Elite VAS (Vanquish Armor System) Plate Carrier from SHOT Show 2017. Well, this year, DR got a first look at a prototype Condor Elite FLASH plate carrier, rifle and pistol mag (magazine) pouches and combat/tactical accessory pouches made from an ultra-lightweight material that your humble correspondent (that would be me) extemperaneously named for them.
Basically, as our friend Chris Dunn of Covered 6 (also written “Covered Six“) and Condor Elite was showing us the new prototype (FLASH) system material, he explained that they didn’t have a name for the material, plate carrier, mag pouches, etc. yet, and then handed me a mag pouch. Upon receiving it, I immediately remarked something to the effect of “Wow, this is f*ckin’ light as sh*t,” to which Dunn replied something akin to, “That’s it! That’s what we’ll call it, “F-L-A-S”. Then we both discussed it, added the “H” from our last word, and named it “FLASH”, ’cause, um, well, that just works better.
So, the “FLASH” system was born, and DR strikes again. We think it’s a great name. It’s bold, it’s catchy, it’s active, it works.
But the FLASH material itself isn’t the only impressive aspect of the system. The prototype Condor Elite FLASH plate carrier, mag pouches and tactical accessory pouches all looked well designed and constructed. The plate carrier looks very well thought-out, and incorporates laser-cut triangular mounting holes that are the latest replacement for/improvement on MOLLE/PALS.
Remember, as you’re looking at the photos and watching the video below, everything you’re seeing is a developmental prototype, NOT a finished, production product.
Anyway, check out Defense Review’s accompanying photos and video below to get all the details.
Company Contact Info:
Condor Outdoor Products
5268 Rivergrade Road
Irwindale, CA 91706
Phone: 1-800-552-2554
Fax: 1-626-303-3383
Email : [email protected]
Website: http://www.condoroutdoor.com
Condor Elite
Toll-free: 888.508.1792
Email Contact Page: https://condor-elite.com/english/contacts/
Website: https://condor-elite.com
Covered 6 LLC
780 Chambers Lane, Suite 210
Simi Valley, California 93065
Phone: 805.926.2055
Email Contact Page: http://www.covered6.com/contact
Website: http://www.covered6.com
Produsul este numit Aspetto Clip și este un sistem destul de ingenios de atașare rapidă / rapidă pentru purtătorii de tacâmuri tactile care sunt rapid, securizat și auto-curățați.ceilalți producători de plăci pentru utilizarea pe veste, dar nu suntem siguri de acest lucru
Sunt descrise aici pungi / veste combinate care, într-o configurație de sac, servesc ca o pungă funcțională și care, într-o configurație de veste, includ un sistem pentru atașarea unuia sau mai multor accesorii modulare la vesta într-o configurație dorită
Armura de rezistență a corpului (SRBA) este un echipament defensiv esențial pentru a proteja corpul uman împotriva rănilor cauzate de înjunghiere
Sistemele blindate cu mai multe straturi, compuse din materiale relativ mai ușoare, cu capacitatea de a furniza protecție personală balistică, sunt în mare măsură investigate și utilizate în veste de armură
