Create a movie in Flash - animation

I want to create 3 movies demonstrating a concept. The movie should play on Windows 7. I am thinking Flash, however, you can propose an alternative method. Each movie should last approx. a minute. Please note that the project will require a few iterations. Please look at the attached three pages. On page 1, what is shown is a cross section of a pipe. The section has elliptical cracks and these cracks grow with time. There are 5 cracks to begin with. These cracks grow both in the length and the depth direction. After a while the two of the cracks joined together and now we have 4 bigger cracks. The cracks on the right-top grew faster and broke through the wall of the pipe and will cause a leak in the pipe. On page 2, all the cracks continued growing and joined into a big complete circumferential crack. (I have not shown in the picture, but, this crack will keep growing until it causes a rupture of the pipe). On page 3, there are three cracks but they only grow a little. My budget is $50. If you bid, please state when you would be able to complete the job.