[Flieger]

My Fluid Mechanics 1 went fine and Mechanical Engineering Design 1 was alright for the most part. I had those on Monday.

There was one problem where there was a stainless steel collar press fit onto a steel shaft at 26 degrees C that was undergoing cyclical thermal loads from 26 degrees to 426 degrees C. We had to determine how long it would last to failure.

Tha involves finding the stresses setup by the press fit at the high and low temperature, combining those into an equivalent, then using some funky formulas and correction factors to determine the number of cycles to failure.

I think the interference that was reported as radial was really a diametrical interference since the stresses were too high. My result showed it would break before one cycle. If it was half as much stress it would be in line with the expected 3000 cycles or so.