WEB Structure-Property relationship of aerospace grade Aluminium-7075 under Monotonic and Fatigue loadingTuesday (26.05.2020) 18:07 - 18:08
Understanding of fatigue and fracture behaviour of Aluminium alloys is of prime importance when it comes to aerospace applications. The 7xxx series of this alloys, owing to its high strength, find extensive application in the aerospace industry. The main alloying elements in 7xxx alloys are Zinc,Copper and Magnesium. These elements are available in the form of precipitates and provides high strength when alloy is age hardened. Al-7075 is the most widely used alloy in aircraft in the 7xxx series. Aerospace structures like upper wing surface , fuselage etc. are often subjected to fatigue loading. A very detailed analysis has been carried out which includes uniaxial fatigue test (room temperature) , fatigue crack growth analysis , K1C and J1C(mode 1 fracture analysis). Tensile and compression tests have also been conducted to find out the mechanical properties of the aluminium alloy. In addition to this, Hardness tests have been performed before and after the tensile tests to measure the effect of strain hardening. Further, fractography has been performed on various fracture specimens. Finite Element Modelling of the monotonic tests have also been performed and results are in close agreement with the experimental results. Thus, an overall structure-property correlation has been established by conducting mechanical and microstructural characterization.