Impact strength behaviour of structural adhesives
Department of Material Science and Manufacturing Technology, Faculty of
Engineering, Czech University of Life Sciences, Kamýcká 129, CZ 165 21 Prague,
Czech Republic
*Correspondence: muller@tf.czu.cz
Abstract:
A cohesive force at an adhesive bond is one of the limit for a strength of an adhesive bonding. This study is focused on an impact force of an adhesive. Samples without a notch were cast in the casting mould at a laboratory temperature with a normal pressure. The instrumentation microcharpy test equipment was used for the evaluation of the impact force. The samples were tempered at a laboratory temperature, 40 °C and 60 °C. Results showed that the temperature of the specimens influenced the impact strength, the toughness and the maximum deformation of the adhesives. Higher temperature decreased the impact force but it increased the toughness. The hardness Shore D of commercial filled two-component epoxies is comparable. A nonhomogeneity of adhesives distinguished for a porosity was found by the investigation of a fracture surface.
Key words:
Deformation, hardness, impact energy, impact force, microcharpy test, temperature