Shear edge tests: a benchmark in investigating the influence of different surface pretreatment methods on the shear stress of intrinsically manufactured metal-CFRP hybrids
by Carolin Zinn; Mirko Schaper; Jonathan Serna Gonzalez; Dieter Meiners; Zheng Wang; Thomas Troester; Florentin Pottmeyer; Kay André Weidenmann
International Journal of Automotive Composites (IJAUTOC), Vol. 2, No. 3/4, 2016

Abstract: At the present time, environmental protection and efficient energy and resource usage are key topics in the industrial sector. In contrast, the desire for comfort, mobility and protection increases progressively and leads to an immense weight gain. Particularly, in the automotive and aerospace industry, strong efforts are made to ensure an efficient manufacturing of lightweight structures. Thereby, an upcoming trend is represented by the application of hybrid structure manufactured by innovative procedures. One of these is the resin transfer moulding procedure, which ensures a highly automated one-step manufacturing of hybrid structures consisting of metal and carbon fibre-reinforced plastics (CFRP). In many cases, the generation of a strong and durable connection between the dissimilar materials is one of the major challenges. In this study, the influence of various surface pretreatment methods on the shear strength of the hybrid structures out of aluminium or steel and CFRP is investigated. In order to eliminate the influence of bending moments and specific material properties, shear edge tests, which enable a pure shear load, are carried out. Furthermore, the failure behaviour is analysed. It is shown that the shear edge test represents an excellent benchmark test to obtain precise interface properties such as shear-stress and fracture work. These properties can be significantly enhanced using surface pretreatment methods.

Online publication date: Mon, 05-Jun-2017

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