Recently, Hexcel has introduced a new type of carbon fiber prepreg patch product, which can significantly improve the performance of aluminum alloy subframes by reducing noise, vibration and roughness (NVH).
This product, named HexPly, consists of unidirectional carbon fiber and an adhesive fast-curing epoxy matrix, which enables fast and efficient bonding to metals in a single step process. The test results show that only 500 grams of HexPly prepreg can fully improve the NVH performance of the aluminum alloy subframe. At the same time, the weight of the aluminum alloy subframe is much lower than that of the corresponding stainless steel products.
The HexPly carbon fiber prepreg technology developed by Hexcel provides a new method for the local reinforcement of aluminum alloy subframes. This method can also functionally manage the noise and vibration performance of components. The technology was tested by Saint Jean Industries on an aluminum rear frame of a production car weighing 18.5kg. The company comprehensively considered the engine types of different driving speeds, and performed a modal analysis on the product within the frequency range of the sub-frame. Based on the results of this analysis, Hexcel calculated the carbon fiber layup and orientation that could achieve optimal mechanical properties and vibration response.
The technological advantages also include reduced production costs, energy consumption, improved driving comfort, production flexibility, and reduced parts count. The technology is suitable for heat engine, electric or fuel cell vehicles, and can enable OEMs to benefit from this fully developed industrial solution.