mechanical

A new type of material can learn and improve its ability to deal with unexpected forces thanks to a unique lattice structure with connections of variable stiffness, as described in a new paper by my colleagues and me. Architected materials – like this 3D lattice – get their properties not from what they are made out of, but from their structure. Ryan Lee, CC BY-ND The new material is a type of architected material, which gets its properties mainly from the geometry and specific traits of its design rather than what it is made out of. Take hook-and-loop fabric closures like Velcro, for example. It doesn’t matter whether it is made from cotton, plastic or any other substance. As long as one side is a fabric with stiff hooks and the other side has fluffy loops, the material will have the stic...

Building robotic grippers that can firmly grasp heavy objects and also gently grasp delicate ones usually requires complicated sets of gears, hinges and motors. But it turns out that it’s also possible to make grippers out of simple sheets of flexible material with the right creases in them. Our lab at Arizona State University has designed curved fold patterns that can change stiffness and flexibility. Flexible materials shaped with these patterns can be used to make simple, inexpensive robotic grippers, swimming robots and other mechanical devices. People naturally vary the amount of stiffness needed to handle fragile and sturdy objects appropriately. Robots interact with the environment in the same way. Curved folding is a simple way to give robots the ability to vary the amount of sti...