Improvement in Adhesion of Sandwich Structures With Polypropylene Honeycomb Core Depending on Surface Roughness and Fabrication Method

Sönmez M. E., Eker Gümüş B., Eryıldız M., Altan M.

4th International Conference on Advances In Mechanical Engineering, ICAME 2018, İstanbul, Turkey, 19 - 21 December 2018, pp.1038-1045

  • Publication Type: Conference Paper / Full Text
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1038-1045
  • Yıldız Technical University Affiliated: Yes


Interfacial bonding is essential in improving the mechanical strength of the sandwich structures. In this study, polypropylene honeycomb core and aluminum face sheets were used to prepare sandwich structures.  The thicknesses of the face sheets (1 mm) and the honeycomb core (10 mm) were taken constant in the experimental study. The adhesive applied between layers of the sandwich structure was epoxy based. Three different fabrication methods were applied according to the adhesive application such as neat epoxy-titan dioxide reinforced epoxy- glass fiber fabric reinforced epoxy. The face sheets were roughened in three different values as 0.6- 2.2- 3.9 (µm) before adhesive bonding. Tensile test was applied in order to observe the effect of fabrication method on interfacial adhesion. It has been seen that at lower surface roughness values, the addition of titan dioxide to the epoxy or the presence of glass fiber fabric increased the tensile strength about 30%. On the other hand, when the surface roughness was increased from 0.6 µm to 3.9 µm, the effectiveness of the fabrication method loosed its importance and mechanical strength of the differently fabricated samples gave close values to each other.