Failure Assessment of Stainless Steel and Titanium Brazed Joints

Following successful application of Coulomb-Mohr and interaction equations for evaluation of safety margins in Albemet 162 brazed joints, two additional base metal/filler metal systems were investigated. Brazed specimens consisting of stainless steel brazed with silver-base filler metal and titanium brazed with 1100 Al alloy were tested to failure under combined action of tensile, shear, bending and torsion loads. Finite element analysis, hand calculations and digital image comparison techniques were used to estimate failure stresses and construct Failure Assessment Diagrams (FAD). This study confirmed that interaction equation R_σ + R_t = 1, where R_σ and R_t  are normal and shear stress ratios, can be used as conservative lower bound estimate of the failure criterion in stainless steel and titanium brazed joints as well as for construction of the Failure Assessment Diagram (FAD).