Reversibly expandable energy absorbing assembly utilizing actively controlled and engineered materials for impact management and methods for operating the same.Reversibly expandable energy absorbing assembly utilizing actively controlled and engineered materials for impact management and methods for operating the same U.S. patent: 7,140,478 Issued: November 28, 2006 Inventors: William Barvosa-Carter, Nancy L. Johnson and Alan L. Browne Assigned: General Motors Key statement: An actively controlled material to reversibly change a shear stress shear stress n. See shear. shear stress A form of stress that subjects an object to which force is applied to skew, tending to cause shear strain. or a flexural flexural pertaining to the flexure of a joint. flexural deformity fixation of joints in flexion. In the newborn called contracted calves or foals. modulus property which includes magnetorheological fluids A magnetorheological fluid is a type of smart fluid. It is a suspension of micrometre-sized magnetic particles in a carrier fluid, usually a type of oil. When subjected to a magnetic field, the fluid greatly increases its viscosity, to the point of becoming a viscoelastic solid. , electrorheological fluids Electrorheological (ER) fluids are suspensions of extremely fine non-conducting particles (up to 50 micrometres diameter) in an electrically insulating fluid. The apparent viscosity of these fluids changes reversibly by an order of 100,000 in response to an electric field. , magnetorheological elastomers and electrorheological elastomers. |
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