Abstract
Next to the electrification of the powertrain, lightweight design plays an important role in automotive industry. Within the last few years an increasing amount of new materials have been used in automotive structures. One type belonging to this new generation of materials is sandwich materials with sheet metal cover sheets and an inner thermoplastic core. The link between the metallic sheet and the thermoplastic core is achieved with the use of an interface layer made of an adhesion promoter. In the present research, the polyamide 6 based adhesion promoter Evonik Hylink was used. To analyze the thermal behavior of the adhesion promoter a DSC analysis was performed. Based on the DSC analysis, a process window is established and verified by mechanical tests. Furthermore, the mechanical properties of the adhesion promoter are characterized with single lap shear tests in dependence to different process parameters temperature, compression time and layer thickness. With the presented method, a process window for processing the adhesion promoter can be established in relation to the varied parameters.
Highlights
With the increasing demand for reduction in pollutant emissions and the growing importance With the increasing demand for reduction in pollutant emissions and the growing importance of of electric mobility, lightweight construction plays a key role in the automotive industry
Lightweight construction plays a key role in the automotive industry
By the use of single lap shear specimens, the process parameters were qualified in a further way to setup an optimized performance regarding shear strength and shear strain
Summary
With the increasing demand for reduction in pollutant emissions and the growing importance With the increasing demand for reduction in pollutant emissions and the growing importance of of electric mobility, lightweight construction plays a key role in the automotive industry. In [6], it was pointed out that the failure of sandwich materials in the forming process is shear based and mainly occurs in the metal/adhesive interface. In order to understand all of the influences on the forming process of sandwich sheets it is necessary to consider the manufacturing process Within this investigation, the influence of the manufacturing parameter time, layer thickness, and temperature on the adhesion promoter between the core and the outer steel layers are pointed out. The main focus is on the shear tensile test and the shear strength of the interface layer For this reason, the sandwich sheet is reduced to the two cover layers and the adhesion promoter inner layer. The temperature, compression time, and layer thickness parameters of the adhesion promoter are varied
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