Konceptarbete om skidbalk i kompositutförande till BVS10
CompositeBeamBvs 10TankBae systemsHägglundsSkidbalkExamensarbeteBvs10KompositerKompositbalkFemSimuleringAbaqusBandvagnPrepreg
This thesis has been performed at BAE Systems Hägglunds, which is located in Örnsköldsvik. Hägglunds has a wide background of engineering, where they have manufactured all from airplanes to lifting cranes. Currently they only produce track vehicles at Hägglunds, where they manufacture the CV90 and BVS10 models. This thesis concerns the BVS10 which is an all-terrain-vehicle. The main purpose with the BVS10 is to enable transportation of material and personnel thru tough terrain. It isn?t designed for hard combat because of its lack of armor in favour of mobilityThe background of this work is that the BVS10 in recent years has been used more and more in close combat. It has also driven over many IED?s in Afghanistan. Because of this a change in the design of the BVS10 had to be carried out, which led to more armor. This resulted in that the total weight increased from 10.5 tons to 15 tons. This caused unacceptable reduction in lifetime of the torsion springs and the vehicle had to be sent back for repair. BAE Systems then decided to put a lot of effort in decreasing the weight of the vehicle by using light weight material in some components.This work is about the development of a concept for the skidbeam where steel is replaced by a composite material. Due to lack of knowledge about fiber composite and their manufacturing processes, a pre-study was made. After the pre-study the concept work on the beam was initiated, but this was only the beginning. When the material in the beam was switched to composite it was required to redesign the components that?s attached to the beam in order to function correctly.Due to limitations in the geometry it was impossible to use glass fiber as the material. Glass fiber is much cheaper than carbon fiber but the strength and E-modulus is lower. Instead it was decided to use carbon fiber combined with epoxy, which is the most common use for structural applications. To minimize the weight of the beam it was decided to use adhesive bonding as much as possible.The concept work was carried out by a single person but it quickly became clear that cooperation with composite manufacturers was needed in order to come up with a good solution to the problem. A large number of Swedish companies were contacted. Nordic Aircraft was one of the most cooperative companies that also had good knowledge of prepreg materials. The prepreg manufacturing method was chosen for its high quality of the final products, and because they are relatively easy to handle.After much discussion and simulations, a final concept was developed whish Nordic Aircraft later on used to calculate a quotation. The concept was met with approval by BAE Systems. Nordic Aircraft claimed to have the knowledge and the experience to manufacture the beam.