A breakthrough achieved at a lab in the United States could bring friction stir welding to assembly lines. The technique involves the use of a spinning tool to generate intense levels of deformation ...

Using high-speed photography and digital image correlation techniques, engineers show that friction along a faultline has a complex evolution during an earthquake that is dictated, in part, by slip ...

1.1 What is friction? Take this everyday example: when a coffee mug rests on a flat table, the kinetic frictional force is zero. There is no force trying to move the mug across the table, so there is ...