Dr Pasqualino Corigliano (Department of Engineering, University of Messina)
Aluminum superstructures and common steel hull connections are of fundamental importance in ships. Traditionally they were performed by riveting, leading to corrosion phenomena and stress concentration sites. Structural transition joint obtained by explosion welding can overcome these problems giving a good compromise in terms of mechanical strength and corrosion resistance. This study regards the structural analysis of explosion welded joints, made of three layers (ASTM A516 low carbon steel, pure aluminium, A5086 aluminium alloy) and used in ship structures. Experimental tests (static bending, fatigue bending and buckling tests) were carried out on explosion welded specimens. Two full-field techniques were applied during the tests: Digital Image Correlation for the detection of displacement and strain fields, and Infrared Thermography in order to detect the superficial temperature of the specimens. Furthermore, a finite element analysis, considering the different mechanical properties of the explosive welded joint, was performed and was validated by means of the experimental results.