Volume 28, Issue 6 (November 2000)
Experimental Evaluation of the Dynamic Shear Strength of Adhesive-Bonded Lap Joints
An experimental method utilizing a novel specimen geometry was developed to determine dynamic shear strength of adhesive-bonded lap joints using the classical Split Hopkinson Pressure Bar (SHPB) technique in compression. The specimens were loaded dynamically at four different loading rates, and the transmitted load through the joint was obtained from the time-resolved strain history assuming one-dimensional stress wave propagation. The shear strength of the joint was determined from the maximum transmitted load, assuming the load was transferred predominantly as shear load through the adhesive-bonded joint. The shear strength of a lap joint bonded using a general purpose epoxy adhesive was obtained at loading rates varying from quasi-static to 2300 N/µs. The results indicate that as the loading rates are increased to 1000 N/µs the shear strength of the particular adhesivebonded lap joint increases to three times its static value, after which it stabilizes.