Crushing soda cans and the mathematics of corrugation formation

Many people have likely found themselves watching oddly satisfying videos of random objects being squashed by a powerful hydraulic press, but rarely do people consider why things squash the way they do. One object that caught the eye of researchers at The University of Manchester was a simple drink can. When crushed while filled with liquid, it behaves completely differently from an empty one. Instead of collapsing suddenly, it produces an ordered sequence of circular rings that appear one by one.