Intrinsic hybrid laminates are well established since many years in aerospace engineering, e.g. Glass Laminate Aluminium Reinforced Epoxy (GLARE) is widely used as a substitute for aluminium sheets of the outer shell of modern aircrafts. The reduction of density and an increased stiffness by compounding glass fiber and aluminium makes GLARE advantageous. Driven by environmental protection acts and the need for lightweight design material compounds attract more awareness in automotive engineering as well. Functional components like chassis springs are well predestined for the application of glass fiber reinforced plastics (GFRP). Therefore an intrinsic hybrid made up by GFRP and a high strength steel has recently been developed and characterized.
For the development of such a hybrid laminate a detailed knowledge of the bonding between both materials is necessary. The hybrid laminate for the tests consists here of one layer of GFRP and one layer of steel, respectively. There are different ways to increase the strength of bonding between GFRP and steel. In this work the influence of surface modifications, a surface structuring and an application of different primers, has been analyzed by static testing. A mode I fracture test has been performed by using a double cantilever beam (DCB) for determining the fracture toughness. Additionally, a mode II fracture test, i.e. an edge-shear-test, has been performed for determining the shear strength of the bonding. Furthermore, a multi - layer intrinsic hybrid laminate has been manufactured for application purpose. It has been tested for bearing strength by means of a static pull-out-test using a bolted joint.
The results of testing are presented and discussed in detail. An outlook for potential applications in automotive engineering is given in particular for its use as a composite material for chassis springs.