Deformation response of Titanium alloy under static and dynamic loading

摘要

Response of a material under dynamic loading is different as compared to static loading. Dynamic material properties are therefore necessary for assessment of structural integrity and safety. Gas turbine aero engine frontal components like fan and compressors are critical and prone for foreign object impact as these components are exposed directly to the environment. Design of aircraft engine components like fan and compressor are critical and it is mandatory to design such components to withstand high impact loads. In view of this high strain rate test of Ti-6Al-4V alloy has been carried out in strain rate range of 1000 s~(-1) to 4000 s~(-1) using Split Hopkinson Bar (SHB). Force equilibrium analysis for each test is carried out to confirm the validity of the test results. Quasi-static test was also carried out for comparison with high strain rate test. From the tests, flow behavior of Ti-6Al-4V alloy at high strain rate is obtained. It is observed that the material have positive strain rate sensitivity and it fails by fracture under high strain rate compressive loading.