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Video: Better Assess Component Quality Of Fiber-reinforced Plastics
Glass or carbon fiber reinforced plastics are important materials in automobile manufacturing, mechanical engineering and aircraft manufacturing - they are formed into different components. The German Institute for Standardization has now published a DIN SPEC which, according to the institute, marks a milestone in the quality inspection of such FRP components: DIN SPEC 25713 "Assessment of component quality after the machining of fiber-reinforced plastics" describes a new method of how have these components checked reliably after finishing without destroying them. The new standard was developed by experts from the Vienna University of Technology and industry on the basis of their own research results.
Thanks to their low weight and great stability, components molded from FRP materials are being used more and more frequently, especially in aircraft, rotor blades of wind turbines and in automobiles. They contribute to significant energy savings. In the production and finishing of such parts, different material properties can cause fraying and chipping or layers to come off. So far, there has been no standardized procedure for assessing these imperfections - accordingly, there has often been a lack of clarity with regard to component quality. DIN SPEC 25713 is intended to remedy this: It describes an objective measurement method that, after the component has been finished, identifies deviations from the ideal shape due to manufacturing.According to the institute, the advantage of the method is its unrestricted applicability - depending on the requirements, from the sporadic use of calipers to continuous assessment in mass production using a guided camera system. The industry can use numbers to describe component quality, which in turn is useful for customer and supplier contracts.
Standards supplemented sensibly
The new DIN SPEC 25713 complements existing standards in the fiber composite industry. It is in line with the DIN SPEC 4885 and the DIN SPEC 8100. DIN SPEC 4885 describes a destructive test using a push frame, which provides material properties for fiber-reinforced plastics. This should be completed quickly and deliver very precise measured values with little scatter. DIN SPEC 8100, in turn, defines the quality criteria for the raw material of FRP, textile fabrics and fabrics made of carbon fiber, for example. The assessment procedure described in DIN SPEC 25713 should now give the opportunity to also test the finished FRP components. Last but not least, the standard serves as a necessary basis for further research and development projects. (sh)
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