A new logic-defying mathematical model could lead to materials for better skin grafts and new smart materials
(Feb.26, 2015) Wake up in the morning and stretch; your midsection narrows. Pull on a piece of plastic at separate ends; it becomes thinner. So does a rubber band. One might assume that when a force is applied along an axis, materials will always stretch and become thinner. Wrong. Thanks to their peculiar internal geometry, auxetic materials grow wider when stretched. After confounding scientists for decades, University of Malta researchers are now developing mathematical models to explain the unusual behaviour of these logic-defying materials, unlocking a plethora of applications that could change the way we envision the future forever.