Ti-6al-4v is used to make a cylindrical pressure vessel having closed ends with an inner diameter of 250 mm and wall thickness of 2.5 mm. what repeatedly applied pressure will cause fatigue failure in 105 cycles (neglect stress raisers effect of the end closure or other geometric discontinuities)? assume r = 0 loading and look up the material properties of ti-6al-4v from lecture 3.