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The US Air Force Academy students demonstrated that the role of the school curriculum is not just to renovate the old ground through the use of new bullet-proof armor made of viscous bodies in class exercises. In 2014, Hayley Weir's first-year task of combining epoxy, aramid and carbon fiber into a ballistic material inspired her to develop this task into a new type of flexible plug.

Composite armor is not new, and Weir's mission is only a standard specification task, but she is not satisfied with the results, although the composite may block a bullet, but the material itself is too hard and fragile. She replaced the epoxy with a shear thickened liquid, as recommended by the college's chemical consultant.

This is not a new substance. The shear thickening liquid is made of nanoparticles suspended in a polymer that looks like a plastic glue and is as flexible as a thawed cryogel component under normal conditions. However, if they are subjected to sufficient impact, their properties will fundamentally change and they will become very hard and become very sticky.

As a common example, take the plasticine ball that you often play as an example. Touch it with your fingers. It is soft and loose. If it is erected alone, it will even flow under its own weight. But if you hit it with a hammer or hit it with a hammer, it will even break like a glass. This shear thickening liquid has been used in the armor of fluid motorcycle leather and military personnel, but Weir has inadvertently discovered something new.

Weir collaborated with Ryan Burke, a professor of military and strategic research, and had an idea of ​​aramid-composite viscous armor. However, when the two looked at the current study, they found that no one had previously studied something similar to the combination of Weir.

In 2016, Weir and Burke conducted a new armor test and they tried to explore the most effective blend of the three materials. They also tried to figure out how stratification would give them the best stopping power. By December, they are ready to test.

They found that they came up with more than just a bullet plug, but a more effective, bigger and faster circle. Most of the 9mm circular perforated layer is only blocked by the aramid fiber backing, but 40 Smith & Wesson will only be blocked if it reaches the third Kevlar aramid fiber layer, while the high speed .44Magnum The big disc did not exceed the first.

Burke said: "The greater the force, the better the hardening or thickening effect.

Weir, who graduated from the college, will continue to conduct research at Clemson University in South Carolina because she and Burke have been working to improve the technology. They believe that the technology will have a wide range of applications, including personal and vehicle armor, bulletproof materials and shrapnel, as well as rapid deployment of roadblocks, as well as the protection of civilians in large-scale shooting incidents.

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