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2102 results about "Bending moment" patented technology

A bending moment is the reaction induced in a structural element when an external force or moment is applied to the element causing the element to bend. The most common or simplest structural element subjected to bending moments is the beam. The diagram shows a beam which is simply supported at both ends. Simply supported means that each end of the beam can rotate; therefore each end support has no bending moment. The ends can only react to the shear loads. Other beams can have both ends fixed; therefore each end support has both bending moment and shear reaction loads. Beams can also have one end fixed and one end simply supported. The simplest type of beam is the cantilever, which is fixed at one end and is free at the other end (neither simple or fixed). In reality, beam supports are usually neither absolutely fixed nor absolutely rotating freely.

Thin film write head with improved laminated flux carrying structure and method of fabrication

The present invention provides a thin film write head having an improved laminated flux carrying structure and method of fabrication. The preferred embodiment provides laminated layers of: high moment magnetic material, and easily aligned high resistivity magnetic material. In the preferred embodiment, the easily aligned laminating layer induces uniaxial anisotropy, by exchange coupling, to improve uniaxial anisotropy in the high moment material. This allows deposition induced uniaxial anisotropy by DC magnetron sputtering and also provides improved post deposition annealing, if desired. It is preferred to laminate FeXN, such as FeRhN, or other crystalline structure material, with an amorphous alloy material, preferably Co based, such as CoZrCr. In the preferred embodiment, upper and lower pole structures may both be laminated as discussed above. Such laminated structures have higher Bs than structures with insulative laminates, and yokes and pole tips and may be integrally formed, if desired, because flux may travel along or across the laminating layers. The preferred embodiment of the present invention improves soft magnetic properties, reduces eddy currents, improves hard axis alignment while not deleteriously affecting the coercivity, permeability, and magnetostriction of the structure, thus allowing for improved high frequency operation.

Spinal interbody fusion device and method

InactiveUS20050027359A1Resist translationalResist rotational movementInternal osteosythesisBone implantSpinal columnBending of plates
A disc replacement spinal interbody fusion device is provided having a central sleeve with oppositely left and right-hand threaded axial bores with different diameters. Circumferential threaded apertures are located on the sleeve and open into the sleeve bores. The device has two opposing plates which are oval-shaped and centrally, axially bored. Each plate has a perpendicular shaft with an axial bore which communicates with the shaft bore. The first shaft has external left-hand threads and the second shaft has external right-hand threads, each to mate with different bores of the sleeve. The outside diameter of the first shaft is smaller than the inside diameter of the second shaft, allowing the two shafts to axially engage. The spinal interbody fusion device operates like a turnbuckle, vertically expanding when the sleeve is rotated in one direction and retracting when the sleeve is rotated in the opposite direction. The assembled device defines an open channel axially. Once the fusion device is set at its proper height, set screws are threaded into circumferential apertures of the sleeve to compress against the shaft threads of each plate to maintain a fixed height. In situ, axial loading of the spinal column upon the fusion device creates a bending moment manifested by a flexing action of the plates to generate opposing axial directional forces which replicate the physiological function of shock absorption, load bearing and load transmission.

Method of reducing wind gust loads acting on an aircraft

A method of reducing the bending moment effect of wind gust loads acting on the wing of an aircraft involves adjusting the aerodynamic configuration of the wing so as to alter the distribution of lift generated by the wing during phases of flight in which critical wind gusts are expected to occur. Particularly, during climb and descent phases of flight below cruise altitude, the lift generated by outboard portions of the wings is reduced while the lift generated by inboard portions of the wings is increased. Thereby, the 1 g basis load acting on the outboard portions of the wings is reduced, and consequently the total load applied to the outboard portions of the wings, resulting from the 1 g basis load plus the additional wind gust load, is correspondingly reduced. This leads to a reduction of the bending moments effective on the wings, and of any rolling moment effective on the aircraft. The required adjustment of the lift distribution is preferably achieved by deflecting the ailerons of both wings symmetrically upward and/or deflecting the flaps of both wings symmetrically downward during climb and descent. The adjustment of the wing configuration is carried out dependent only on flight parameters such as the altitude, speed and gross weight, and does not require rapid sensing of the occurrence of a wind gust and rapid actuation of control surfaces to try to instantaneously counteract a wind gust as it occurs.

Structural joint connection providing blast resistance and a beam-to-beam connection resistant to moments, tension and torsion across a column

ActiveUS20050204684A1Mitigates likelihood of progressive collapseBuilding roofsFloorsGusset plateEngineering
At a beams-to-column joint connection of two beams to a column, in which the joint connection comprises both a gravity load-carrying connection and a moment-resisting connection, there is added a beam-to-beam connection across the column, using two gusset plates, facing each other, on opposite sides of the joint connection. The gusset plates, which are not connected to the column in a moment-resisting connection, connect the two beams, in a tension and moment-resisting connection with respect to each other, by longitudinal welds between the gusset plates and the beams, and provide the capability of withstanding disastrous events, including loss of column support and/or loss of integrity of the beams-to-column joint connection and severe torsional and lateral inelastic deformation due to direct blast pressure. When subjected to such violent conditions and upon loss of column support, and, the likely loss of integrity of the beams-to-column joint connection, the two beams and two gusset plates provide independent beam-to-beam structural continuity, causing the two beams to act as one long beam, or, in other words, a “double-span” condition is created. Such beam-to-beam connection is capable of carrying the tension, torsional and moment loads placed upon the beams, to the ultimate capacity of the beams. Inasmuch as a gusset plate is disposed on each side of the beams-to-column joint connections, substantial shielding of those connections against blast and impact forces is also achieved.

Design method for longitudinal pre-stressing tendons of variable-cross-section pre-stressed concrete continuous bridge

The invention discloses a design method for longitudinal pre-stressing tendons of a variable-cross-section pre-stressed concrete continuous bridge. The optimization design method for the longitudinal pre-stressing tendons of the pre-stressed concrete continuous bridge is built based on the design principle of the pre-stressed degree and through combining an analytic method with a finite element method and compressively considering dead load and live load action effects. A three moment equation of the variable-cross-section pre-stressed concrete continuous box girder bridge is established to solve the internal force of the structure under the action of the self weight on the basis of the average bending moment method. A calculation formula of pre-stressed effective pre-pressure is built through a load equal effect method and a unit load method; a creep effect calculation formula is built through a force method; the temperature effect and the automobile load effect are calculated through the finite element method; and a variable-cross-section statically indeterminate structure pre-stressing tendon reinforcement calculation formula is obtained through combination of the stress ratio with the definition of the competitive pre-stressed degree.
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