Second in my "ductile flow in everyday objects" series... Ultimately the goal of posting these photos is to develop a repository of teaching images for familiar substances which flow when conditions of temperature and pressure are sufficient.

Here's a plastic cat-food dish (originally square) which deformed in a ductile fashion after going through the heat-dry cycle on a kitchen dishwasher:


Note how the dish has "sagged" around one of the dish rack's supporting bars, like a damp cloth draped over a stick.

Now that it has cooled, it can be removed and show how much it has deviated from its original shape (how much it has strained):

Labels: analogies, structure, teaching