An improvement in the life time calculation is aspired by the characterisation of the
life time behaviour of a typically lightweight aircraft titanium alloy by describing the
microstructure. Therefore, extensive research on a Ti-6-4 fitting element has been carried
out. In addition to static tensile tests, rotating bending tests and fracture mechanical
tests, component tests with constant and variable load were performed. Simultaneously, the
microstructures of the specimens and tested components are extensively analysed at several
points including the lug area, as well as, the specimen’s microstructure taken out of the
lower link fitting. A common consideration of life time results as well as results of the
microstructure in the life time calculation shows the possibilities for more precise life
time estimation.