AE12.pdf

The governing body applies stringent requirements on

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The governing body applies stringent requirements on the racing teams to ensure regulations protect the driver from serious injury wherever possible. 20 This is achieved using three types of tests. 1. Impact tests are carried out at various speeds with an impactor having a mass of 780 kg (1720 lb f ). In the current regulations are three impact tests. All of them use sacrificial carbon fiber reinforced plastic structures to absorb the energy. The regulations require that no permanent damage be visible in their supporting structures. This requirement is obviously subjective. Two of these composite structures are applied to the front and side of the driver safety cell whereas the rear test structure is attached at the gearbox casing. 401 Special Applications of Acoustic Emission Testing P ART 2. Acoustic Emission Testing for Structural Design of Grand Prix Cars F IGURE 11. Plan view of generic grand prix car.
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2. Static load tests are applied to the energy absorbing structures to verify their strength normal to the direction of the impact. 3. Static load tests are applied at various predetermined positions on the chassis. These are used both in the certification process and also as a verification tool during the season to ensure that all chassis are of a weight and a stiffness similar to those of the one chassis that undergoes the impact tests. Load Bearing Parts Routine tests are carried out on components to ensure service loads can be sustained. This process is important for a number of reasons. The main reason is driver safety because impacts with barriers and other vehicles within grand prix are caused by driver error or component failure, causing loss of driver control. Component failure is therefore where designers place their effort. Despite the engineering effort used to produce a modern car, there are still a significant number of component failures in service. Structural Design The initial stage of vehicle design essentially involves deciding how much space is required, and in which areas it is required, to best package all the vehicle systems. From this, some guidance is then required from a combination of geometry defined by regulations, required space for structures, aerodynamic devices and any other systems. Aerodynamics is currently the most important factor that decides the shape of all external surfaces and structural efficiency is often compromised as a result. Hand calculation is the primary geometry definition tool open to the designer at an early stage. Loading is defined in a variety of ways, depending on the part in question, but techniques are invariably based on a combination of experience, logged data and calculations. Finite element analysis is widely used in an attempt to optimize structural efficiency of most load bearing components on a modern grand prix car.
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  • Fall '19
  • The Land, Nondestructive testing, Acoustic Emission, Acoustic Emission Testing

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