57results about How to "Good energy absorbing properties" patented technology

The invention discloses a negative poisson ratio structural component based on an inner sunken hexagonal multi-cell unit. The negative poisson ratio structural component comprises a plurality of unitcell structures, each of the unit cell structures consists of two inner sunken hexagons, the inner sunken hexagons are in a left-right symmetric dovetail shape, and every two inner sunken hexagons arearranged in an orthogonal mode and intersect at two concave angle apexes to form a complete unit cell structure; the multiple unit cell structures are connected with each other horizontally in both directions by sharing one support cell arm, and are extended in the horizontal direction to form a continuous unit layer; and a plurality of unit layers are connected with each other in the vertical direction by sharing curved ribs to form a multi-layered cross-aligned inner sunken honeycomb-shaped three-dimensional negative poisson ratio structure. According to the negative poisson ratio structural component based on the inner sunken hexagonal multi-cell unit, a significant negative poisson ratio effect is achieved, higher elastic modulus, shear modulus and storage modulus can be generated when loaded, better rebound toughness and fracture resistance are achieved and improved with the enhancement of the negative poisson ratio effect.

The invention relates to a high-speed water entry buffer head cap of an underwater vehicle. The high-speed water entry buffer head cap comprises an outer cover shell, a combined buffer piece and a combining piece. The outer cover shell is installed outside the whole buffering head cap, so that the aircraft has a good pneumatic head shape, the stability of the whole structure of the buffering headcap is guaranteed in the air flying stage; the buffering head cap can be integrally broken and disintegrated when entering water, and the movement performance of the aircraft in water is not affected.The combined buffer piece can isolate the impact when entering water to reduce and limit the water entering impact load acting on the aircraft. The combined buffer piece is a revolving body and bonded at the front end inside the cover shell, a groove is formed in the rear end of the buffer and completely wraps the head of the aircraft, and the combined surface of the combined buffer piece and thebuffer serves as a supporting surface and a supporting point for combining the aircraft and the head cap. A connecting piece adopts a spring clamp device to guarantee firm and reliable connection between the aircraft and the buffer head cap, and resistance to disengagement loads of the aircraft in various mechanical environments such as impact, vibration and external loads in the carrying and running process is realized.

The invention provides a structure of a portable directional explosion-proof device for a passenger cabin of a civil aircraft. The portable directional explosion-proof device comprises a spherical tank body and a reinforced edge panel. The spherical tank body is of a structure provided with an inner layer, a middle layer and an outer layer. The two sides of the spherical tank body are each provided with a hanger handle, and moving, rotating and structure locking of the directional device are facilitated. Compared with the principle of a conventional explosion-proof device, the portable directional explosion-proof device for the passenger cabin of the civil aircraft is characterized in that the portable directional explosion-proof device is majorly used for guiding shock waves generated in certain-equivalence explosion to the outside of the passenger cabin of the aircraft, energy is released, and safety of the passenger aircraft and passengers are guaranteed to the maximum. A quick-release type locking structure is adopted for the portable directional explosion-proof device for the passenger cabin of the civil aircraft, a corresponding groove just needs to be designed in a designated position with the minimum bomb risk in the passenger cabin of the aircraft only, and the portable directional explosion-proof device can be quickly locked into the designated position with the minimum bomb risk. An additional opening and closing mouth does not need to be designed to allow explosives to be placed in, the opening and closing mouth is prevented from being the vulnerable point of the device, and portable directional explosion-proof device is made to be simple in structure, high in explosion-proof energy and convenient to operate.

The invention discloses an integral body structure of a large highway bus with a safety partition. The body structure comprises a first safety partition in front of the body structure, wherein the upper portion of the inside upright post of the first safety partition is fixed on the front beam of the top cap of the body structure, the lower portion is fixed on the front lower beam of the chassis of the body structure. Multiple first inclined struts are arranged between the inner side upright post and the front side periphery of the body structure, and the first inclined struts and the inner side upright post form multiple triangular structures; a second safety partition is positioned at the rear part of the body structure, wherein the upper portion of the inner side upright post of the first safety partition is fixed on the rear beam of the top cap of the body structure, the lower portion is fixed on the rear lower beam of the chassis of the body structure. Multiple second inclined struts are arranged between the inner side upright post and the rear periphery of the body structure, and the second inclined struts and the inner side upright post form multiple triangular structures.

The invention relates to the technical field of concrete, in particular to high-performance structure light aggregate concrete and a preparation method thereof. The high-performance structure light aggregate concrete is prepared from the following raw materials in parts by weight: 200 to 400 parts of cement, 300 to 900 parts of gravels, 300 to 600 parts of sand, 100 to 200 parts of coal ash, 20 to 50 parts of silica fume, 180 to 250 parts of water, 2 to 8 parts of a water reducing agent, 5 to 10 parts of basalt fiber and 150 to 300 parts of hollow glass beads. The high-performance structure light aggregate concrete has the advantages of reasonable design, light mass and high intensity; the problem of low mixability of light-weight raw materials and concrete is solved; the problem of reduction of the performance of the light aggregate concrete due to a floating phenomenon of light aggregates is improved; the concrete with uniformly distributed light aggregates and high energy absorption characteristic is obtained.

The invention provides hollow glass internally provided with a sunshading device. The hollow glass comprises a cavity and the sunshading device in the cavity, wherein the cavity is constituted by twotransparent plates A and a sealing assembly A; the sunshading device comprises a plurality of sunshading blades, linkage parts and an angle linkage adjusting and lifting device; and the multiple sunshading blades are mutually connected through the linkage parts and mounted on the angle linkage adjusting and lifting device. The hollow glass is characterized in that the sunshading blades are each composed of a cavity and aerogel in the cavity, wherein the cavity is constituted by two transparent plates B and a sealing assembly B. The hollow glass internally provided with the sunshading device has the good heat-insulation and heat-preservation properties and the good light transmitting property and the adjustable solar heat gain coefficient, and is suitable for the fields of door windows, curtain wall glass, daylighting roofs and the like of environment-friendly buildings, ultra-low energy consumption buildings and near-zero energy consumption buildings.

The invention discloses an anti-chiral structure, an energy-absorbing buffer structure and a vehicle body. The anti-chiral unit has a rotating negative Poisson's ratio structure, a stress is conductedon pitch circles through ligaments in a bearing process, so that the pitch circles have a rotating trend, meanwhile, the ligaments are rolled up to form a negative Poisson's ratio state with reducedcompression cross sections and increased stretching cross sections. After ligament deformation is finished, the pitch circles are extruded against each other, at this time, a second deformation stageis entered, three anti-chiral units are located in three mutually perpendicular planes in a three-dimensional coordinate, and the three pitch circles are intersected mutually and connected to form sixconnection points, so that when a hybrid chiral structure impacted, the three pitch circles are not prone to dislocation or deformation, and the overall structure is stable, so that the bearing capacity and the energy absorption capacity of the anti-chiral structure are strong.

The invention discloses round steel pipe concrete with a negative Poisson ratio effect and a design method of the round steel pipe concrete. The round steel pipe concrete comprises a round steel pipewith a negative Poisson ratio effect, a steel support with a negative Poisson ratio effect and concrete. The steel support is arranged on the inner wall of the round steel pipe. Concrete is filled inthe round steel pipe. The round steel pipe and the steel support are of hole structures which are alternately and periodically arranged in horizontal and vertical directions. The relationship betweenthe height L of the round steel pipe and the diameter D of the round steel pipe should comply with 2.5<L/D<5, the relationship between the thickness r of the round steel pipe and the diameter D of theround steel pipe should comply with 30<D/r<40, the height of the steel support is equal to L, and the width d of the steel support should comply with 0.6<d/D<0.7. The round steel pipe concrete can actively restrain the transverse deformation of core concrete, thereby improving the compressive bearing capacity and ductility of the structure. Meanwhile, the hole design of the negative Poisson ratiosteel pipe can improve the anti-seismic performance of the structure.

A press forming method for a metal sheet is provided. The method is capable of improving a forming limit at which a crack appears in a metal sheet and being easily applied to a large press machine for mass production with a low cost, without correcting the shape of dies, such as a punch and an upper die, or changing the shape or material of a blank to a special shape or material. Dies, a surface roughness of which is an arithmetical mean roughness Ra of 7.5 [mu]m or smaller, are used as a punch 10, an upper die 20, and a blank holder 30. Fluid with a kinematic viscosity of 500 mm<2>/s or lower(40 DEG C) is used as a lubricant, and is supplied to a space between a metal sheet 100 and the blank holder 30, a space between the metal sheet 100 and the punch 10, and a space between the metal sheet 100 and the upper die 20. A die is detached from a workpiece in the middle of forming, and resuming the forming, thereby improving formability.

The invention discloses a novel automobile energy absorption box which comprises core bodies and a wrapping layer, wherein each core body is obtained by rolling composite unidirectional carbon fiber prepreg cloth into a cylinder; the composite unidirectional carbon fiber prepreg cloth is formed by stacking and curing 6-12 layers of unidirectional carbon fiber prepreg cloth; the wrapping layer is formed by stacking and curing 6-12 layers of unidirectional carbon fiber prepreg cloth; the wrapping layer wraps and fixes at least two or more core bodies; and the adjacent core bodies are tightly attached to each other. The novel automobile energy absorption box is prepared by carrying out vitrification heat treatment through a three-stage heating method. The novel automobile energy absorption box is prepared through the process routes of cutting, laying, vacuumizing, hot pressing, vitrifying, polishing, slotting and the like, an existing automobile energy absorption box can be partially or completely replaced, and the problems that an automobile energy absorption box is low in specific energy absorption, large in weight, poor in energy absorption capacity, too high in cost and the like are solved.

The invention provides a preparation method for aerogel composite glass. The aerogel composite glass is composed of an aerogel and a glass phase which is used for bonding the aerogel. The preparationmethod comprises the following steps: (1) mixing: uniformly mixing glass powder with the aerogel; (2) melting: heating the glass powder in a mixture obtained in the step (1) to a molten state so as toobtain semi-solid mixed glass melt; (3) calendaring molding: subjecting the mixed glass melt obtained in the step (2) to calendaring molding between rollers or roller plates, and then carrying out cooling; and (4) annealing. The aerogel composite glass disclosed by the invention has good heat insulation performance, light transmittance, safety performance, sound insulation performance and noise reduction performance, and is applicable to the field of doors and windows, curtain wall glass, lighting roofs and the like of green buildings, ultralow-energy-consumption buildings and near-zero-energy-consumption buildings.

The invention discloses a microstructural bionic composite board based on a China hemp fiber composite. The natural China hemp fiber composite is selected as face plate layers, thick cordage preimpregnated thermal plastic or thermal setting material and fine cordages are selected as framework materials in a reinforcing layer, the fine cordages are adopted as reinforcing ribs for fixing and supporting, and thus the hemp fiber bionic composite board with a specific microstructure is formed. Two or more face plate layers can be arranged as needed; the face plate layers are formed by combining a China hemp fiber composite plate with one or more of a carbon fiber composite plate, an aramid fiber composite plate or other plates, and thick cordages of the framework part are distributed in orthogonality or in parallel or by 45 degrees or by 60 degrees. The microstructural bionic composite board is good in environment-friendliness, light, high in rigidity and strength, good in energy absorption performance and capable of being widely applied to the fields such as automobiles, buildings, decoration and packages, has good application prospects and is environmentally friendly and novel.

The invention discloses a fiber reinforced composite material simulating a scorpion chela structure and function. According to the composite material, a plurality of spiral structures are mutually nested to form a three-dimensional integral array structure, and the three-dimensional integral array structure is separated by a transition layer in the longitudinal direction; each spiral structure is formed by laying fiber layers, and each fiber layer is composed of a plurality of fibers which are arranged in a one-way mode; the fiber layers are spirally arranged around a torsion shaft which is perpendicular to fiber laminates and is arranged at the corners of the laminates, and meanwhile, the spiral structures are obliquely arranged around an inclined shaft which is perpendicular to the torsion shaft and is arranged in the planes of the fiber layers; and randomly distributed pore channels exist in the spiral structure. The structure of the scorpion chela is simulated, so that the impact resistance and the flexibility in the thickness direction of the structure are ensured, and meanwhile, the bending and shearing resistance of the fiber composite material is effectively improved through nesting of the spiral structure and the duct tubule structure.