Effect of specimen support gasket on impact test results of small size specimens

Three different thickness specimens of Q235B steel plate were subjected to impact tests at room temperature, and the effect of adding shims on the impact test results of small size specimens was studied. The results show that for small size specimens with an impact absorption energy greater than 60 J and a thickness of 7.5 and 5.0 mm, the addition of shims had little effect on the impact test results of the specimens. For small size specimens with a thickness of 2.5 mm, adding shims could position the specimen at the center of the pendulum to avoid additional energy absorption. Whether to add gaskets had little effect on the lateral expansion value, fracture microstructure, and macroscopic morphology of small size specimens with different thicknesses.