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In 2020, a 4-door JL Wrangler Unlimited overturned upon impact with the rigid barrier during the IIHS's 40-mph small overlap test. When the vehicle struck the barrier, the front axle tucked underneath the Wrangler's structure, causing the vehicle to ride over its own axle and land on its side. [22]
The test car is driven into a rigid barrier with full overlap at a speed of 50 km/h (31 mph). A small 5th Percentile dummy is seated in the driving position and in the rear seat. The aim is to test the car's restraint system, such as airbags and seat belts. [19]
The second barrier type, semi-rigid, is commonly known as guardrail or guiderail barriers. The initial installation of this type can reach as much as $100,000 per mile. [8] These more forgiving barriers are meant to absorb the impact of a crash, and as a result, increase the cost of their life-cycle with each crash and each repair. The third ...
An impact attenuator, also known as a crash cushion, crash attenuator, or cowboy cushion, is a device intended to reduce the damage to structures, vehicles, and motorists resulting from a motor vehicle collision. Impact attenuators are designed to absorb the colliding vehicle's kinetic energy. [1][2] They may also be designed to redirect the ...
A Jersey barrier, Jersey wall, or Jersey bump is a modular concrete or plastic barrier employed to separate lanes of traffic. It is designed to minimize vehicle damage in cases of incidental contact while still preventing vehicle crossovers resulting in a likely head-on collision. Jersey barriers are also used to reroute traffic and protect ...
Ceramic armor systems defeat small arms projectiles and kinetic energy penetrators by two main mechanisms: Shattering and erosion. When a hard steel or tungsten carbide projectile hits the ceramic layer of a ceramic armor system, it is momentarily arrested, in a phenomenon known as dwell. Depending on the thickness and hardness of the ceramic ...
The right graph shows the energy levels as a function of the spacing between atoms. When the atoms are far apart (right side of graph) the eigenstates are the atomic orbitals of carbon. When the atoms come close enough (left side) that the orbitals begin to overlap, they hybridize into molecular orbitals with different energies.
A Bremer wall, or T-wall, is a twelve-foot-tall (3.66 m) portable, steel-reinforced concrete blast wall of the type used for blast protection throughout Iraq and Afghanistan. The Bremer barrier resembles the smaller 3-foot-tall (0.91 m) Jersey barrier, which has been used widely for vehicle traffic control on coalition military bases in Iraq ...