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The numerical analysis of the main layer thickness on the impact response of the steel butt joint bonded by multi-layer under the Charpy impact test is investigated using the elasto-plastic finite element method (FEM). The results obtained from numerical simulation show that both the elastic strain and plastic strain occurred at the point near the upper or lower surface decreased significantly when the main layer thickness increased from 0.1 mm to 0.4 mm. The value of the normal stress Sx and the von Mises equivalent stress Seqv is increased first when the main layer thickness increased and then it decreased significantly when the main layer thickness is greater than 0.2 mm. There is a strong value fluctuation for stress Seqv at the point 0.5 mm away from the upper surface when the main layer thickness is greater than 0.2 mm

Effect of main layer thickness on the response of multi layer bonded steel butt joint under Charpy impact test