58results about How to "Good energy absorbing properties" patented technology

Provided is a hot-rolled steel sheet having a high yield ratio and excellent low-temperature impact energy absorption and HAZ softening resistance wherein the maximum tensile strength is 600 MPa or higher, and also provided is method for producing the same. The steel is formed from, by mass %, C: 0.04 to 0.09%, Si: 0.4% or less, Mn: 1.2 to 2.0%, P: 0.1% or less, S: 0.02% or less, Al: 1.0% or less, Nb: 0.02 to 0.09%, Ti: 0.02 to 0.07%, and N: 0.005% or less such that 2.0 Mn + 8 [%Ti] + 12 [%Nb] 2.6, with the remainder being Fe and inevitable impurities. The pearlite surface area percentage is 5% or less, and the total martensite and residual austenite surface area percentage is 0.5% or less, with the remainder being a ferrite and / or bainite metal structure. The average crystal grain size of the ferrite and bainite is 10 [mu]m or smaller, the average grain size of phase-separated alloy carbonitride that contains Ti and Nb is 20 nm or less, and the yield ratio is 0.85 or greater.

A bumper system includes a tubular beam and a thermoformed energy absorber with crush boxes formed into a base flange, such as by vacuum or thermoforming processes. The crush boxes have planar energy-absorbing sidewalls a depth of about 10 mm to 35 mm, wall thicknesses of about 1 mm to 3 mm, and are formed from polyethylene or other thermoform materials having a memory. The base flange can include thermoformed features engaging recesses in the beam, and is combinable with injection-molded or foam energy absorbers for design flexibility. In one form, the energy absorber includes a thermoformed first sheet forming crush boxes and a second sheet bonded to the first sheet to define apertured air pockets. Related methods of manufacture and impacting are also disclosed.

A reusable energy-absorbing crash attenuator comprises a base, a rail disposed on and extending along a length of the base, and a plurality of energy absorbing modules slidably disposed on the rail. Each of the energy absorbing modules comprises a first module portion and a second module portion which are attached together. Each of the module portions comprise plastic, preferably high density polyethylene (HDPE), and have a combination of concave and convex curvature. A plurality of fender panels are disposed in adjoining end-to-end fashion along each side of the length of the crash attenuator. The fender panels are arranged to slide together in telescoping fashion upon impact of the crash attenuator by a vehicle.

There is provided a bumper beam that is formed of a 7000 series aluminum alloy hollow extrusion, has a crushed longitudinal portion, and locally has a low-hardness region in a bumper stay joint section. A portion (portion to be heated) of end portions of the bumper beam formed of a tempered member of a heat-treatable aluminum alloy extrusion is subjected to reversion treatment, thereby forming a heat-affected zone in a bumper stay joint section. An end region (portion to be crushed) of the heated portion is subjected to cold crushing, and then the whole bumper beam is subjected to age hardening. The heated portion and a non-heat-affected zone are hardened through the age hardening, thereby forming a low-hardness region that overlaps the joint section in a portion of the heat-affected zone.

The invention discloses a recoverable and deformable energy-absorbing box for automobiles based on additive manufacturing, which comprises an upper end cover, a filling structure, a thin-walled shell, a mounting plate and a thin-walled corrugated pipe, the bottom of the thin-walled shell is provided with a mounting plate, and the mounting plate There are several installation holes on the top, the filling structure is set inside the thin-walled shell, the thin-walled bellows is set inside the filling structure, and the upper end cover is set on the top of the thin-walled shell; the thin-walled shell is detachable from the anti-collision beam of the car through the mounting holes The connection, filling structure, thin-walled shell and thin-walled bellows are integrally printed and formed of high-entropy alloy materials; the invention has excellent energy absorption characteristics, and the filling structure proposed by the invention is a regular hexahedron in which the four sides of the two opposite faces are respectively It is connected with four other unit cell structures in different directions, which improves the energy absorption while improving the bearing capacity of the energy-absorbing box, so that it can maintain the stability and continuity of energy absorption, high bearing capacity, good stability, and can be reused. Reduce car maintenance costs.

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 a buffering and energy absorbing structure. The buffering and energy absorbing structure comprises a housing. The buffering and energy absorbing structure is a multi-layer metal grid structure or porous bubble structure filled in the housing; the metal grid structures or porous bubble structures of adjacent layers are lengthways alternatively overlapped in positive and negative poisson ratio; the metal grid structure in the positive poisson ratio is composed of a three-dimensional honeycomb grid structured formed by array type regular hexagonal pore grids; the metal grid structure in the negative poisson ratio is composed of a three-dimensional stretching and expanding grid structure formed by array type concave angle pore grids; the meshes of the porous bubble structure in the positive poisson ratio are of an array type rhombus structure; the meshes of the porous bubble structure in the negative rhombus structure are of an array type four-star shaped structure. Compared with the traditional buffering and energy absorbing structure, the buffering and energy absorbing structure can effectively reduce the peak value of the impact force, so that the whole energy absorbing process is stable, and as a result, the energy absorbing efficiency of the structure can be increased.

The invention discloses an energy-absorbing 3D printing material, a preparation method thereof, and an energy-absorbing device. The energy-absorbing 3D printing material includes a mixture of tert-butyl methacrylate, aliphatic epoxy acrylate and a photoinitiator, and the tert-butyl methacrylate and aliphatic epoxy acrylate are mixed according to the ratio of the two reactions . The energy-absorbing device is formed by photocuring the energy-absorbing 3D printing material of the present invention. The components of the energy-absorbing 3D printing material in the embodiment of the present invention have good coordination and synergistic effects, a stable dispersion system, and 3D printability, and the material formed after photocuring has excellent stretchability and excellent energy absorption effect. It also has shape memory properties.

The invention discloses a low-cost titanium-based porous material preparation process with high energy absorption characteristics. The process includes: 1. Precompressing the accumulated titanium-based scraps along the thickness direction to obtain a titanium-based porous green body; 2. The titanium-based porous green body is sintered in high temperature vacuum to obtain a titanium-based porous body; 3. Inject 502 glue into the pores of the titanium-based porous body to fill each node area, and dry at room temperature to obtain a titanium-based porous material. The present invention uses titanium-based scraps as raw materials, and adopts powder metallurgy technology to prepare titanium-based porous blanks, so that nodes and metallurgical bonds are formed between iron filings, and 502 glue is injected into the pores of titanium-based porous blanks to improve the The bonding area between titanium-based scraps can be improved, thereby improving the overall bonding strength. The compressive strength and energy absorption characteristics of the obtained titanium-based porous materials are significantly improved, and the density is low, which is suitable for impact protection of vehicles and aircrafts. At the same time, the cost of raw materials Greatly reduced.

The invention relates to the technical field of material forming, in particular to a method for preparing a foamed metal thin-walled composite pipe with a controllable filling density gradient. According to actual needs, by controlling the variation mode of the hole density gradient and the difference range of the hole density of different specifications of the foamed metal, the obtained Metal foam with flexible and stable and controllable density, and then prepare multi-specification metal foam thin-walled composite pipes with controllable filling density gradient through appropriate connection methods, so as to expand the application range of thin-walled pipes and provide automotive design engineers with more Large design space.