Investigation of Axial Tensile Force Effect on Bending Fatigue Lives of Resistance Spot Welded Dual Phase Steels
Mustafa Göktaş Muhammed Elitaş Bilge Demir
AbstractIn this study, a dual phase steel DP600 which is frequently used for automotive industry because of lightness, durability performance and economical attainability, was joined by resistance spot welding (RSW) method that are used frequently in automobile industry, and then exposed to cyclic bending load with different amplitude values. In addition, fatigue test was repeated with additional tensile force that is applied with bending forces and results that obtained from bending fatigue tests and bending-tensile fatigue tests are evaluated and compared with each other. As a result of the fatigue tests that performed to the samples, it was observed that the axial tensile force decreased the fatigue life. In literature frequently axial forces were applied to resistance spot welded specimens for fatigue tests in most research. In real condition, fusion zone can be exposed to different axial forces. It is necessary to know and investigate the fatigue life due to tensile and bending resultant force as well as axial force, which is very important for vehicle stiffness and reliability.