Construction Technology

Construction Technology

Construction Technology

Section 1

Question 1:

Beam systems have changed radically over the last 20-30 years. More demanding safety regulations of government and different concepts style gave rise to new designs. The materials have also changed dramatically. (1986) Kirk, 22) With the emphasis on vehicle performance, high strength and ultra high strength steels have been developed. This allowed designers to reduce the sheet thickness, hence the weight. For reasons of low cost and light weight, steel is well positioned in the market of the beam current system. There are several factors we must consider when choosing a system of beams. The most important factor is the capacity of the beam system to absorb enough energy to meet the OEM standard internal Beam. Another important factor is the ability to absorb the energy of the beam and stay intact in high-speed impacts. Weight, manufacturability and costs are also issues that we consider as an engineer during the design phase. The two beams of initial cost and repair costs are significant. Formability of materials is important for the large beam scanning systems. Another factor is considered recyclable materials, which is an advantage for steel. There are four systems harness to use today:

Face Bar Metal

Beam Plastic Fascia And Reinforcing

Plastic Housing, Reinforcing Beam And Mechanical Energy Absorbers

Plastic Fascia, Reinforcing Beam And Foam Or Honeycomb Energy Absorber

Metal bar system of the face consists of a single steel beam that adorns the front or rear of a vehicle and acts as the primary energy absorber during a collision. The regulations of beams to resist one mph 2.5 (4 km / h) impact on the position or walk more Less than two inches (50 mm) with no apparent damage and no damage to safety related items. plastic fascia and beam building system consists of a plastic housing and a beam reinforcement that attaches directly to the vehicle frame or engine compartment rails. It is mainly used in Europe and Japan, where regulations are less stringent than the Beam the world. beam system with a plastic fascia, reinforcing beam and energy absorption are used primarily in North America. The energy can be absorbed by a mechanical damper, by foam or honeycomb or the reinforcing beam products in high-strength steel used to produce beam brackets, support beams and building have a minimum yield strength greater than or equal to 241 card and / or a minimum tensile strength less than or equal to 690 Map. Ultra grade high strength steel are defined as those having a minimum tensile strength greater than 690 Map. Face bars, because of their depth and draw complex shapes, are produced by the process of drawing. The high formability steels are required to meet the face of a bar drawing. Faced bars are painted or chromed. Thus, a high surface quality is required on the steel. The plants use a special treatment of the casting, coating slab, hot rolling and quenching in the production of steel bar in the ...