Bulletproof Vest Research Paper

Bulletproof vest are made of either ceramic materials, layered Kevlar, metal plating, tensil liquids or a variety of other materials depending on the calibre of the weapon being shielded against. Small hand guns with low power will be effectively protected against by vests made of Kevlar fabric while higher calibre weapons will require more protection. Hand grenades and shotguns may require metal plated vests. (“What is a Bulletproof made of”).

A bullet proof vest consists of a vest-shaped panel made up of advanced plastic polymers that are composed of many layers of Kevlar or Spectra shield. The layers of Kevlar are sewn together using Kevlar thread but the nonwoven spectra shield is coated and bonded with resins such as Kraton and sealed between two sheets of Kevlar. Once all of the panels of Kevlar are sewn together it is placed inside of a fabric shell that is usually made from polyester and cotton blend or nylon. A bulletproof vest may also have nylon padding for extra protection. If the bullet proof vest is intended to be worn in especially dangerous situations puches are built in to hold plates of metal or ceramic bonded fiberglass.

World War Two's most famous contributions to the history of body armor is the flak jacket. Made from ballistic nylon, the flak jacket was "cumbersome and bulky" and "was ineffective against most pistol and rifle threats," (Bellis, n.d.). However, flak jackets were very effective in preventing casualties related to shrapnel. Shrapnel did account for as much as 70% of all Second World War casualties (Pike, 2011). No significant advancements in body armor were made between the end of World War Two and the 1970s. Even during the Vietnam War, flak jackets were still being used. In the 1970s, though, Kevlar was invented. Kevlar and other lighter weight materials allowed for constant protection that was relatively comfortable to wear. Moreover, the improved materials could protect greater surface area on the body. As Pike (2011) points out, "Most fatal penetrating injuries were caused by missiles entering through areas not protected by body armor, such as the face, neck, pelvis, and groin." Unlike earlier materials, Kevlar also

fiber and Kevlar for military applications. “But the frame and design of the InvinciBull helmet

The outer shell of the helmet has 2 layers of carbon fiber. Carbon fiber is extremely strong and light. The construction of the outer shell begins with a thin layer of gel coat. After that a special resign is added to the shell. The special resign includes several types of glass, carbon, Kevlar, and other exotic fibers and weaves. Kevlar is what makes carbon fiber helmets extremely durable and light. All that added together is what gives the outer shell its glossy finish look. Underneath the outer shell is the BEADALL liner. BEADALL liner is a foam layer that is made of polystyrene or polypropylene. This layer of foam is put in the crown of the helmet, which makes it absorbs energy that the outer shell didn’t absorb at the time of impact. The last piece of the helmet is the form-fitting layer that is made out of nylon or Nomex, which is a fire retardant material that protects a racer from getting burned in case a fire does happen. You can also find that Nomex is used in firesuits. Today all race helmets have to have a snell rating in order to race. The snell rating is accumulated by a series of tests of impact done to the helmet, to see how well it holds up and if it flies off the test subjects head.

The energy absorbed by the fabric in the armor is equal to the loss of kinetic energy carried by the bullet during impact.

The two molecules on the left are the chemicals that reacted to make Kevlar, which is the molecule on the right. Kevlar can be grown to different lengths so when people manufacture it, it can be fine tuned to a specific standard depending on what the intended use is for. This makes it so there are many different Kevlar grades that you can purchase and use. The chemicals used to make Kevlar are polyparaphenylene terephthalamide and terephthaloyl chloride. After this reaction is finished, the polymer that is produced is spun into strong, thick fibers. This polymer is extremely strongly bonded, and each strand is bound together by hydrogen

They started to look at many different materials but couldn’t find anything. They thought maybe they could find a material that works like an ice pack, to keep it cold on the inside. They did a bunch of research and finally found a material that might work, Alumina silica hydrate fibers.

Snipers have a reputation for being deadly, but some rise above the rest when it comes time to kill, These 10 deadliest snipers in all of history were so good that they were straight up bad (to the bone). Grab your bulletproof vest, make sure no one is watching, and check out the full list below!

[FONT=Times New Roman]This is your final examination for Assault Rifle permit in SAST. You need to answer 4 questions out of 5 correct to pass the test. If you fail to pass the test, you'll recive 3 days suspension from re-taking the test, after 3 days you may re-take the trainings and examination. Once you've sent the test, you'll recive a response from us within 48 hours, with the amount of points and if you passed it or not. If you did, you have premission to use any type of Assault rifle while patrolling. Good Luck![/FONT]

Marksman itself has turned into a considerable measure of topics for game, one SWAT Sniper Anti-terrorist monger. Here you will go about as a marksman who will discover rivals and complete remotely.

s tower received a message that a SEAL team that was sent in to clear an ISIS armory but the team was pinned down in the building. There was massive numbers and heavy artillery. The alarm went off and the speakers told every soldier to get ready for war. Every tank, humvee, helicopter, and jet were being filled with bullets, missiles, fuel, and soldiers. All of the approximately 500 thousand soldiers at the base were in a car, plane,or helicopter.

People have asked why I have decided to pursue this career. I have told them many times that it’s is just what I need to do. When Iraq had people executing Americans, I took it personal. As if they were killing a family member, a person I hold dearest. I like to think that I am everyone’s friend, but if you hurt one of them it irritates me. I don’t threaten people I just tell them what’s going to happen at some point in time if they keep doing it. I have been in a few disagreements because of this. I don’t feel like I should share any of that in this paper because it may be a little inappropriate.

In 2014, people walked through movie theatre doors, sat down in a cushioned seat and waited to see American Sniper on the big screen. The biographical drama follows United States Navy Seal Chris Kyle throughout his life as the deadliest marksmen in U.S. Military history both on the frontline and stateside. Although it is rated R, this is a story everyone needs to hear. The film gives great acting performances while the personal accounts bring about a sense of realism and patriotism to viewers.

Should people under the age of 18 be required to wear a protective helmet while skateboarding, in-line skating, bicycling, snowboarding and skiing? I believe truly believe so. The thrill in these activities, are to speed jump tricks and ride.