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Experimental and Numerical Investigation of the Mixed Mode Fracture Toughness of Adhesively Bonded Joints

Following the ongoing quest to improve product properties, and at the same time to increase quality and to reduce component weight, it is necessary for the automotive industry to introduce more sophisticated joining technologies, for example adhesive bonding. The objective of this paper was to investigate the mixed mode fracture behavior of a commercial epoxy based adhesive. Experimental tests with bonded compact tension shear (CTS) steel specimens were conducted under various mixed mode conditions. The results of the experiments were used afterwards to calculate the stress-intensity-factors (SIF) pertinent to the experimental boundary conditions. This was achieved by means of the Finite Element Method (FEM). This procedure has been carried out for different adhesive layer thicknesses. It turned out, that the stressintensity-factors depend upon the adhesive layer thickness. This is shown in the two fracture toughness envelopes determined by FEM. A possible reason is stated at the end of this paper. Further work to verify the determined SIF is in progress.