75results about How to "Higher specific stiffness" patented technology

The invention provides a preparation method for SiC particle reinforced aluminum-based composite material. The preparation method comprises the steps as follows: step 1, the Al-Si-Mg alloy is placed into a homemade dry pot resistance furnace, after the Al-Si-Mg alloy is completely melted, 1-17 parts of intermediate alloy Al-R by weight, which is prepared in advance, is added into the melt, wherein the intermediate alloy is prepared in advance through a surface modification technology; step 2, the melt is stirred to enable rare-earth elements to be uniformly distributed into the melt; step 3, SiC is added into the melt; step 4, the melt is poured into a metal mould for formation; step 5, quenching is performed in water with the temperature of 50-60 DEG C; step 6, quenching is performed in water with the temperature of 70-80 DEG C; step 7, air cooling is performed after aging thermal insulation is performed for 6.5-7.5 h at the temperature of 165-175 DEG C. The thermal shock performance of the aluminum-based composite material can be greatly enhanced, the dimensional stability of the material is maintained when the material is used in temperature varying places, the service life of the material is prolonged, and the material has a broad market prospect when being applied to parts requiring weight reduction and excellent abrasion resistance.

The invention relates to a three-dimensional braided carbon fiber reinforced metal-matrix composite and a preparation method of the three-dimensional braided carbon fiber reinforced metal-matrix composite. The preparation method comprises the following steps that firstly, pre-treatment is conducted on carbon fiber; secondly, carbon fiber bundles and fine metal wires are bound, so that metal wire-carbon fiber composite bodies are obtained, a three-dimensional framework reinforcing body is braided from the metal wire-carbon fiber composite bodies; thirdly, the braided three-dimensional fiber framework reinforcing body are soaked with silicon carbide particle dissolving slurry and potassium fluozirconate water solution; fourthly, the three-dimension fiber framework reinforcing body treated inthe third step is placed in matrix metal liquid and undergoes extrusion forming under ultrasonic vibration, and then the novel metal-matrix composite is obtained. According to the three-dimensional braided carbon fiber reinforced metal-matrix composite and the preparation method of the three-dimensional braided carbon fiber reinforced metal-matrix composite, a three-dimensional fiber framework isbraided from carbon fiber, net-shape manufacturing of the novel metal-matrix composite reinforced by the three-dimensional fiber framework reinforcing body and having excellent performance is achieved, the types and application range of the metal-matrix composite are expanded, and the three-dimensional braided carbon fiber reinforced metal-matrix composite certainly has broad application prospectin the aerospace field, the military project field and the civil field.

The invention discloses a light Ka-band reflecting-surface antenna and a manufacturing method thereof, and relates to the technical field of reflecting-surface antennas. The antenna comprises a trusssupport, a central reflecting surface, a main reflecting surface, a feeding source network support device, a feeding source network and an auxiliary reflecting body, wherein each main reflecting-surface surface unit comprises a honeycomb main body, a skin and six pairs of pre-buried pieces, adjacent two main reflecting surface units are connected by a top connection piece and a panel adjustment assembly, and the main reflecting surface and the truss support are connected by a root adjustment assembly and a pull rod assembly. Each main reflecting surface unit is independently connected with thetruss support, and radial, circumferential and normal adjustment of the gesture of the main reflecting surface is achieved by the semi-enclosed panel adjustment assembly; the reflecting surfaces areintegrally connected by the panel adjustment assembly and are directly connected with a panel pre-buried piece, and the welding matching process is omitted; and by the open truss support and the pullrod assembly, the design of an antenna back rack is greatly simplified. The antenna has the characteristics of light weight, good shape maintenance, high adjustment efficiency and the like.

A continuum and discrete body coupling topology optimization method is provided. The invention solves the problem that the topology optimization method of the continuum or the discrete body alone in the prior art can not accurately obtain the optimal topology configuration of the continuum and the discrete body coupling structure form. At first, a finite element mesh model of coupling of degrees of freedom of a continuum and a discrete body is established, then a unified optimization model of a continuum and a discrete body is established, and the objective function, constraint condition, optimization method and convergence criterion are set in the optimization model. Finally, the optimal topology configuration of the continuum and discrete body is obtained by performing optimization solving based on the defined optimization model and displaying the topology optimization results. The invention can realize topology optimization of a continuum and discrete body coupling structure, improve specific stiffness of the continuum and discrete body coupling structure, realize lightweight of continuous and discrete body coupling structure on the premise of ensuring mechanical performance, and provide effective solution for conceptual design of continuous and discrete body coupling structure.

The invention belongs to the technical field of structural design of metal materials, and provides a radial negative gradient foamed aluminum sandwich panel. The aluminum sandwich panel is of a layered structure and sequentially comprises a lower plate layer, a radial negative gradient foamed aluminum core layer and an upper plate layer from bottom to top. The inner surfaces of the upper plate andthe lower plate are connected and fixed with the top and the bottom of the radial gradient foamed aluminum core layer by gluing or welding; the radial negative gradient foamed aluminum core layer isformed by sequentially arranging a plurality of radial negative gradient foamed aluminum unit cells in a plane, and the contact parts between the unit cells are welded or subjected to secondary foaming connection; the density of the negative gradient foamed aluminum unit cells starts from the center of a square and is gradually increased in the radius direction. The panel is reasonable in structure, excellent in performance, low in density, large in specific stiffness, high in specific strength, good in stability, impact resistance, electromagnetic shielding, excellent in damping characteristic, low in heat conductivity and electric conductivity, heat-insulating and sound-insulating, and has wide application prospects in the fields of engineering materials for chemical engineering, metallurgy, machinery, building civil engineering, high-speed automobiles, ships, packaging and transportation, aerospace, military protection and the like.

The invention provides a high-specific-strength and high-specific-stiffness aluminum-lithium alloy thick-wall annular piece and a preparation method thereof, and belongs to the technical field of aluminum-lithium alloy new materials and manufacturing. The aluminum-lithium alloy thick-wall annular piece comprises the following chemical components: 0.8-2.8 wt% of Cu, 2.4-3.8 wt% of Li, 0.8-1.8 wt% of Mg, 0.5-1.5 wt% of Zn, 0.1-0.5 wt% of Er, 0.05-0.2 wt% of Zr, less than or equal to 0.08 wt% of Fe, less than or equal to 0.05 wt% of Si, and the balance of Al and inevitable impurities, wherein the total amount of the alloy elements is less than or equal to 8.5 wt%. The preparation method comprises the steps of alloy proportioning, boron nitride brushing, smelting, refining, centrifugal casting and heat treatment. According to the invention, the forming process of the aluminum alloy annular piece can be simplified, the internal structure is compact, and the specific strength and specific stiffness of the aluminum alloy annular part are remarkably improved.

The invention discloses an expandable branching rib plate high-precision reflecting plane, which comprises a center hub, main rib plates, auxiliary rib plates, positioning sheet-pressing springs, a paraboloid, a compressing belt, a waveguide rod and a feed source, and is characterized in that the upper side edge of each main rib plate is designed with dual straight pipes with an omega shape after being expanded, so that the out-plane bending rigidity is improved, and local buckling is substantially reduced. Each main rib plate is designed with the branched auxiliary rib plates, so that a defect of not satisfying an ideal paraboloid equation because of being away from a middle region is compensated, and the profile precision of a radial radiation rib plate antenna is improved. The lower side of the dual omega-shaped straight pipes is provided with the main rib plate with uniformly distributed circular holes, so that the structure mass can be effectively reduced, and the specific rigidity is improved. The positioning sheet-pressing springs drive expansion of the auxiliary rib plates and realize in-place expansion of the auxiliary rib plates at the same time.

The invention discloses a low-noise power capacitor using damping steel plates. The low-noise power capacitor comprises a capacitor shell, a core, a casing, and a sound insulation cavity. The casing is arranged on the top of the capacitor shell. The core is arranged inside the capacitor shell. The sound insulation cavity is arranged at the bottom of the capacitor shell. The sound insulation cavity is a closed cavity structure composed of inner and outer steel plates. A damping material is arranged between the outer steel plate and the inner steel plate to form a three-layer closed cavity structure. By making use of low density, sound insulation, noise reduction, vibration absorption, high strength, high specific rigidity and other advantages of the damping steel plates, vibration at the bottom of the power capacitor can be reduced. The closed cavity formed by welding the damping steel plates is used to insulate sound in the main contribution frequency band of noise, so that vibration at the bottom of the power capacitor is reduced, and actual engineering requirements are met.

The invention relates to the technical field of particle-reinforced aluminum-based composite materials, and discloses a nano-silicon carbide particle-reinforced aluminum-based composite material and a preparation method thereof. The composite material is composed of nano-silicon carbide particles with a volume fraction of 6-16% uniformly distributed in an aluminum alloy with a volume fraction of 84-94%. The preparation method is firstly through batching, ball milling, preforming and hot pressing Prepare 1-5% nano-silicon carbide particle-reinforced aluminum-based composite material, then vacuum concentrate and evaporate part of the aluminum alloy matrix, and finally undergo solid solution and aging treatment to obtain the reinforced aluminum-based composite material with nano-silicon carbide particle content of the present invention. Material. Experimental data proves that the reinforced aluminum matrix composite material with high nano-silicon carbide particle content prepared by the present invention not only has high thermal conductivity, electrical conductivity, specific modulus, wear resistance and other functional properties due to the high content of nano-silicon carbide particles, but also takes into account the strength and plastic toughness.

The invention discloses a titanium alloy lattice structure reinforced aluminum-based composite material and a preparation method thereof. The titanium alloy lattice structure reinforced aluminum matrix composite comprises a Ti-6Al-4V lattice reinforcement body and an aluminum matrix, and the Ti-6Al-4V lattice reinforcement body is of a two-dimensional circular or two-dimensional honeycomb structure. According to the method, a three-dimensional model of a lattice structure of a Ti-6Al-4V lattice reinforcement is designed, and Ti-6Al-4V metal powder is formed through selective laser melting; the method comprises the following steps: heating an aluminum matrix and a Ti-6Al-4V dot matrix reinforcement body to 700-850 DEG C in a vacuum environment, and infiltrating the aluminum matrix into a dot matrix structure of the Ti-6Al-4V dot matrix reinforcement body by utilizing inert gas pressurization; and cooling to obtain the titanium alloy lattice structure reinforced aluminum matrix composite material. The composite material prepared by the invention is accurate and controllable in structure, so that the performance can be effectively regulated and controlled, and the composite material has the excellent characteristics of high specific strength and high elastic modulus.

The invention discloses an anti-collision buffer energy-absorbing device for a side of a truck. The anti-collision buffer energy-absorbing device comprises a wave type energy-absorbing retainer plate, two energy-absorbing supporting filling barrels, tapered prism energy-absorbing supports and fixing plates. The wave type energy-absorbing retainer plate is far away from the outer side of a truck frame. The energy-absorbing supporting filling barrels act functions of fixing and connection in the middle and can absorb energy. The whole device is connected to the truck frame through the tapered prism energy-absorbing supports. The energy-absorbing supporting filling barrels are connected with the tapered prism energy-absorbing supports through the fixing plates. With the anti-collision buffer energy-absorbing device, when a small vehicle crashes into the side of the truck, more huge energy from the crash can be absorbed, initial peak stress of the crash of the small vehicle is decreased, the small vehicle is prevented from crashing into the bottom of the truck, and crash injuries of passengers in the small vehicle are reduced.

The invention discloses a light anti-bending and anti-torsion bionic composite material and a preparation method thereof. The composite material comprises a bottom layer, a lower partition plate layer, a hollow structure middle layer, an upper partition plate layer and an outer layer which are sequentially arranged in a stacked mode from bottom to top; the hollow structure middle layer comprises a first-stage dense hole structure, a loose hole upper-layer structure, a first-stage loose hole structure, a loose hole lower-layer structure and a second-stage dense hole structure which are sequentially stacked from bottom to top; and the first-level compact pore structure, the first-level loose pore structure and the second-level compact pore structure are each composed of a woven fiber resin layer, and each woven fiber resin layer is formed by alternately winding weft-wise fibers and warp-wise fibers on a core film. The middle layer of the hollow structure is arranged in the mode that the outside is dense and the inside is sparse, the weight of the material can be reduced, the specific rigidity of the material can be improved, when the material is bent, the upper surface of the middle layer of the hollow structure bears tensile stress, the lower surface of the middle layer of the hollow structure bears tensile pressure, and the bending resistance and toughness of the material are improved.