We study the peculiar wrinkling pattern of an elastic plate stamped into a spherical mold. We show that the wavelength of the wrinkles decreases with their amplitude, but reaches a minimum when the amplitude is of the order of the thickness of the plate. The force required for compressing the wrinkled plate presents a maximum independent of the thickness. A model is derived and verified experim...

Consider a distributed system running a protocol in which processes exchange information by passing messages. The gossip problem for the protocol is the following: Whenever a process q receives a message from another process p, q must be able to decide which of p and q has more recent information about r, for every other process r in the system. With this data, q is in a position to update its ...

Quenching and partitioning steel is a recently developed low-alloy material with retained austenite meeting the requirements to high strength ductility. The basic mechanical properties of QP980 are derived through static uniaxial tensile tests, trend plasticity strain rate obtained by dynamic tests. ultimate reaches 1050.67 MPa, which only about 50 MPa higher than that DP980. And highest elonga...

Large ellipsoid parts are prone to wrinkle when forming by using traditional stamping. Aiming solve the wrinkling problem in large parts, EMIF method with a variable blank holder is proposed this paper. The numerical simulation has shown that sheet material near is, as consequence of stamping, subjected circumferential compressive stress. When drawing height was 100 mm, metal notably wrinkled. ...