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In the present paper it is shown that fatigue life prediction of a complex spot welded joint must take into account for damage evolution of each spot weld, thus considering the load changes in each spot during damage progression. A method which uses a theoretical stress solution (ERS) is presented and its application is reported both on traditional spot welded joints and on a non trivial joint. Through the use of ERS-N curves the fatigue data performed on different joint geometries can be successfully reconciled.

A theoretical model is developed for crushing of honeycomb structures. Axial crushing is considered for both adhesive bonded and welded honeycombs. The two mentioned cases present different kinematics of collapse; consequently, the Mean Crushing Strength assumes different values. The theoretical model discussed is also able to predict Bar Compressive Strength which is a fundamental variable to be taken into account in the design of energy absorbers for the automotive industry. The analytical results are successfully compared with experimental literature data and numerical results.