Aramid

contact with kevlar, the energy is stolen. Kevlar is a polyarylamide plastic fiber which is a high tensile strength. For the fibers to stretch a little, it takes a huge amount of energy. Chemical Structure Kevlar is a type of fiber called aromatic polyamide (aramid) as known as super-heroes of the fiber world. Aramid fiber is produced by spinning a solid fiber from a liquid resulting polymer chains allowing the increase in fiber strength. Kevlar is formed by a condensation reaction of an amine (1,4-phenylene-diamine) and acid chloride (terephthaloyl - chloride)(Kablr,2012). When Kevlar is spun, the chains lock together via H-bonds to form a sheet that has a very high tensile strength of about 3,620 MPa, and a relative density of 1.44 (Quintanilla, 1990). (Kablr,2012). Three Grades of Kevlar There are 8 types of Kevlar available but 3 being the most commonly used. The most common Kevlar fibers are Kevlar®, Kevlar® K-29 and Kevlar® K-49(Ryan,2011). Kevlar® is mainly used as reinforcement in tires and rubber mechanical goods. Kevlar® K-29 is used for industrial applications such as body armor, cables, and brake lining due to its lightweight and non-flammable. Kevlar® K-49 has very high tensile strength of all aramids and is used in boat hulls, and in the aerospace industry as well as military jets. Uses and Applications The use and applications are endless and has earned worldwide recognition due to its unique properties, Kevlar is used in everything from protective…

is positively correlated to the force applied to the spring: F= kx, where k = f(x)*Fimpact. The force of impact would mostly dissipate through the springs, and the specific behavior of the springs can be modeled in later stages. The component of force that needs to be looked at primarily is the x component, since this is the component of the force that would produce the most torque on collision. Since the x component of both the spring and the impact forces are relatively more important, this…

Kevlar properties Chemical make-up Kevlar is a weaved fibre known as poly-paraphenylene terephthalamide. Kevlar is part of the aramid family. (Kevlar-The Super Tough Fiber)Aramid chemical name is aromatic polyamide. Aramids was the first organic fibre to reinforce advanced composites. The reason being it strength, and tensile modulus was high enough to be used in advance composites. The fibre mechanical properties of an aramid are higher then most materials like steel and glass fibres if…

Created in 1965 by Stephanie Kwolek, Kevlar is a synthetic fiber that can be used in a wide variety of ways [1]. It is used to make body armor, tires and automotive belts. Governments around the world use this material to protect their soldiers in combat, motorcyclists use it to protect themselves against road rash in the event of a crash, and it is also utilized in ropes and cables. While these uses for Kevlar have revolutionized personal protection, there is one particular application for…

They also limit hearing, vision, and mobility of the wearer. These limitations slowly led to the decline in the popularity of the Brodie helmet. They were also rendered obsolete by the rising popularity of bullets and shrapnel with greater mass and higher velocities in World War II. While significantly less popular, steel helmets are still being used, today, especially by the Israeli civil defense forces. Aramid ballistic helmets Defined as a class of heat-resistant and strong synthetic…

electrons and a strong covalent bond is formed between the atoms of a Kevlar molecule. Between the Kevlar molecules in a Kevlar sheet, there are strong intermolecular forces known as hydrogen bonds. They are formed by the strong directional interaction between the two permanent polar bonds of N-H and C=O due to the great difference in electronegativity between nitrogen and hydrogen and the carbon and oxygen. Strong intermolecular forces then hold these sheets of molecules together. Panel 4…

KEVLAR COURSE: CHEMISTRY COURSE CODE: CHY 1001 FACULTY: Mrs. MANJU S L FALL SEMISTER 2015-2016 Kevlar will be the enrolled trademark for the para-aramid engineered fiber, identified with additional aramids, pertaining to example, Nomex andTechnora. formulated coming from Stephanie Kwolek with DuPont in 1965, this high-quality material \'m initial industrially utilized to be a portion of the mid 1970s being a substitution pertaining to steel in…

As seen in figure 2, the formworks contain 9 slots with 20 cm cubed opening in each slots. With these slots, the appropriate dimension can be achieved for the concrete specimens. The formwork that were used were made out of wood and nailed together. There are a total of 30 concrete specimens that will be tested in this research. There are five different groups that the concrete cubes will be separated into. Each group will contain six specimens with each group differing in the amount of…

can be obtained by making boat hull to should suffer minimum resistance from water. Generally chopped glass fibers and polyester resin are used as raw material for such boats manufacturing. We call those materials as Glass Reinforced Plastic (GRP). It is said that mass production of glass strands started in 1932. First boat manufactured from fiberglass is appeared in 1950. Bust still after 1960 only Glass Reinforced Plastic boat production increased to large extent. And by this year marine…

straight blades. These wood hockey sticks use to have a long bend in the end which was impossible to hit on the reverse side the hook was 124mm across. By 1850 and 1860 hockey sticks were made of maple. Before 1860 it didn’t matter which side of the stick the ball touched but the stick become flat on one side and have a rounded edge on the other side. The ball was only allowed to touch the flat side. The hockey stick continued to be modified and they were soon being produced from oak because it…