48results about How to "Increase specific energy absorption" patented technology

Disclosed are an automobile front anti-collision beam structure and application thereof to automobiles. The automobile front anti-collision beam structure is composed of a main beam, an inner plate and an energy absorbing device, wherein the inner plate is fixedly connected to the main beam; the energy absorbing device is fixedly connected to the inner plate and at least composed of a bottom plate, a first conical tube, a second conical tube and a third conical tube; the bottom ends of the first conical tube, the second conical tube and the third conical tube are fixedly mounted onto the bottom plate, and the first conical tube, the second conical tube and the third conical tube are gradually nested from inside to outside; the heights of the three conical tubes are gradually reduced from inside to outside, the diameters of the bottom ends of the three conical tubes are gradually increased from inside to outside, the thicknesses of the three conical tubes are gradually increased from inside to outside, and the tapers of the three conical tubes are gradually increased from inside to outside. According to the automobile front anti-collision beam, when collision deformation occurs, crumple of a single stage gradually develops into simultaneous crumple of two stages and then into simultaneous crumple of three stages, plastic deformation can be gradually increased, a regular and stable deformation mode and significant buffer effects can be achieved, and energy absorption can be gradually increased. Therefore, the automobile front anti-collision beam can enhance structural stability and crashworthiness and meanwhile improve the collision angle adaptability.

The invention discloses an impact-resistant and high-energy-absorption lattice sandwich structure with a negative poisson ratio characteristic. The lattice sandwich structure is formed on the basis ofa high-performance negative poisson ratio lattice core material. The negative poisson ratio lattice core material is obtained by changing an included angle between a supporting column and a coordinate axis through a three-dimensional cubic structure. When the included angle between the supporting column and the coordinate axis is not equal to zero, the negative poisson ratio lattice core materialis obtained. The negative poisson ratio lattice material and two thin plates form a novel negative poisson ratio lattice sandwich structure, and the structure has the characteristics of a traditionalauxetic lattice structure and a traditional lattice sandwich structure at the same time, that is, the structure has the characteristics of the negative poisson ratio and the same-direction curvature;meanwhile, has excellent mechanical properties such as ultra-light weight, high specific modulus, high specific strength, impact resistance and high energy absorption. In addition, the sandwich structure has high adjustability, and the mechanical property of the lattice sandwich structure can be adjusted and controlled within a large range by adjusting the deflection angle of the supporting column and the relative density of the lattice material. The lattice sandwich structure has a great application prospect in the field of aerospace.

The invention discloses a carbon fiber honeycomb tube structure, and relates to the field of protective structures. A traditional protective structure is high in weight and simplex in material and structure form. A carbon fiber honeycomb tube is prepared from pultrusion tubes with orthogonal carbon fibers being laid, and the large tubes and the small tubes are connected into a whole through resin.The carbon fiber tube structure obtained through a pultrusion process has the advantages of large strength, high stiffness, fast forming and the like, and is lower in weight, larger in stiffness andhigher in specific energy absorption compared with the traditional protective structure; and the needed forms can be prepared according to the demands, and the application range is wide.

The invention discloses a circular tube type laser welded sandwich plate explosion-proof wall. The circular tube type laser welded sandwich plate explosion-proof wall comprises a sandwich plate explosion-proof wall body and a supporting structure body, and the sandwich plate explosion-proof wall body is mounted on a module truss of the upper of a target platform through the supporting structure body; the sandwich plate explosion-proof wall body comprises a first panel, a second panel and a sandwich layer, and the sandwich layer is formed by a plurality of circular tube which are arranged vertically and paralelly; the first panel and the second panel are correspondingly arranged on the two sides of the sandwich layer, the first panel serves as an explosion facing face, and the second panelserves as an explosion backing face; and the first panel and the second panel are correspondingly connected with each circular tube in the sandwich layer in a laser welded mode. The sandwich layer ofthe explosion-proof wall body has the characteristics of being high in specific energy absorption, low in first peak crumpled load and long in crumpled stroke so that the explosion-proof wall body canabsorb impact energy well; and meanwhile, the first panel and the second panel are arranged on the two sides of the sandwich layer, so that the explosion-proof wall body has the characteristics of being large in in-plane bending rigidity and high in specific strength, and the explosion-proof capability of the explosion-proof wall body can be further improved.

The invention provides an automotive collision energy-absorption sandwich structure. The automotive collision energy-absorption sandwich structure is characterized in that an end energy-absorption layer, an energy-absorption inner core and an energy-absorption inner core wrapping layer are included; the end energy-absorption layer is formed by compositing titanium metal layers and aluminum alloy level corrugated pipes, and the aluminum alloy level corrugated pipes are arranged between the two titanium metal layers; the energy-absorption inner core comprises aluminum alloy circular pipes and metal foam materials, and the metal foam materials are arranged in an aluminum alloy circular pipe interlayer; an energy-absorption inner core structure is formed by inner core unit cell structures on an X axis, a Y axis and a Z axis in an array mode according to an upright-inversion-upright sequence, and all the inner core unit cell structures are connected in a braze welding mode; and the inner core unit cell structures comprise the aluminum alloy circular pipes and the metal foam materials, and the metal foam materials are arranged in the aluminum alloy circular pipe interlayer. The problemsof high peak stress, low efficiency, high weight, narrow application face and the like of a traditional collision energy-absorption box are solved.

The invention discloses a battery pack sandwich shell with a negative poisson ratio layered quadrilateral energy absorption structure. The battery pack sandwich shell comprises a shell and an energy absorption structure; the energy absorption structure comprises energy absorption units and inverted energy absorption units, and the inverted energy absorption units are arranged between every two adjacent energy absorption units; each energy absorption unit comprises a first energy absorption cell body and a second energy absorption cell body arranged in the first energy absorption cell body; the first energy-absorbing cell body is an isosceles triangle with a concave bottom edge, the concave angle theta1 of the bottom edge is an obtuse angle, and the vertex of the concave angle is located on the angular bisector of the vertex angle of the first energy-absorbing cell body; the second energy-absorbing cell body is an isosceles triangle with a concave bottom edge, the concave angle theta2 of the bottom edge is an obtuse angle, the two bevel edges of the second energy-absorbing cell body are parallel to the two bevel edges of the first energy-absorbing cell body respectively, and a gap is reserved between the concave bottom edge of the second energy-absorbing cell body and the concave bottom edge of the first energy-absorbing cell body; and the three vertexes of the second energy absorption cell body are connected with the three vertexes of the first energy absorption cell body through linear connecting walls correspondingly. The shell is simple in structure and has both the energy absorption effect and the impact resistance.

The invention belongs to the technical field of automobile safety protection, and particularly discloses an automobile collision energy absorption composite material and a preparation method thereof.The composite material comprises M layers of particle reinforced foamed aluminum core materials and M+1 layers of dual-phase steel plates, the foamed aluminum core materials and the dual-phase steel plates are sequentially and alternately stacked, and the dual-phase steel plates are composed of austenite phases and martensite phases. According to the automobile collision energy-absorbing material,martensite is induced to form through dual-phase steel deformation at the moment of collision, so that a large amount of energy is absorbed at the moment of collision, the structure is kept stable, then residual energy is absorbed through porous fluffy foamed aluminum, and the defects that a traditional collision energy-absorbing structure is prone to losing efficacy at the moment of collision, and the energy absorption effect cannot be completely reflected are overcome. Besides, the dual-phase steel has higher strength and work hardening rate than aluminum alloy and other light metals, so that higher specific energy absorption can be realized under the condition of not sacrificing the strength and light weight, the same safety goal is achieved, and meanwhile, more cost is saved.

The invention discloses a multi-cell energy absorption structure combination optimization design method, which comprises the following steps: establishing a multi-cell energy absorption structure finite element model according to a material to be optimized, and determining a design variable, a constraint condition and an optimization target; carrying out an orthogonal experiment according to the established three-level design variable table of the variables and an optimization target; establishing a target response data matrix, and performing Taguchi analysis on the target response data matrix; performing grey correlation analysis based on the normalized signal-to-noise ratio sequence of each response to obtain a grey correlation coefficient sequence corresponding to each response; determining a preliminarily optimized variable combination to realize rapid positioning of a preliminarily optimized result in a large space; selecting a significant influence variable and carrying out secondary optimization by using a preliminary optimization variable; and carrying out multi-objective continuous optimization design to obtain a Pareto leading edge of an optimization problem, and determining an optimal compromise design point. According to the method, the specific energy absorption of the structure can be improved, the peak acceleration can be reduced, and the lightweight and safety performance of the structure can be improved to a great extent.

The invention provides a single crystal cell metal tube for absorbing energy during vehicle collision. A main body is a conical thin wall pipe, the taper of the main body is 0.3, and the ratio of the wall thickness to height of the main body is (1:15)-(1:30). In an oblique collision process of a conical tube with the taper of 0.3, with the decrease of an oblique collision deflection angle, the component force in a loading velocity direction increases, so that the initial peak load is increased and the specific energy absorption is increased. Therefore, optimization is realized when the taper is 0.3.

The invention discloses a four-unit-cell metal tube for absorbing energy during automobile collisions. A body is a conical thin walled tube. A cross-shaped tube wall is arranged inside the body. The tube wall extends from the top end of the body to the bottom end of the body. An inward-concave preformed deformation groove is formed in the middle of the body. The taper of the body is 0.3. During contact between a conical tube and a rigid wall, due to the fact that the outer diameter of the conical tube is smaller than that of a circular tube, the strength of the conical tube is lowered, the conical tube is more easily compressed compared with a circular tube with the larger outer diameter, and a small initial peak load is generated correspondingly. Accordingly, in the collision energy absorption process of the thin walled tube, compared with the circular tube, the specific absorbed energy of the thin-walled tube can be increased due to the conical tube; due to the taper of the conical tube is 0.3, in the inclined collision process, the component force in the speed loading direction is increased along with decrease of the inclined collision angle, so that the initial peak load is increased, and the specific absorbed energy is increased; accordingly, the taper is 0.3 preferentially. After the preformed deformation groove is added, deformation happens at the preformed deformation groove, the deformation direction and the deformation process become controllable, and the heat absorption performance of the four-unit-cell conical tube is further improved.

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 discloses an energy absorption structure optimization method taking an expected force response process as a target, and the method comprises the steps: setting a proper expected force response curve, continuously updating the value of a target function in an optimization process in an iteration mode so as to obtain a new finite element model, and enabling an actual force response curve of a structure to be gradually close to the expected force response curve. And the energy absorption capacity of the structure is improved. According to the method, the deformation mode of the thin-walled tube can be changed, low-energy-absorption Euler deformation is changed into high-energy-absorption progressive buckling deformation, and multiple energy absorption evaluation indexes can be improved at the same time. The optimized actual force response curve of the thin-walled tube is closer to the expected force response curve. The energy absorption component obtained through the methodcan generate an ideal deformation mode, more impact kinetic energy is dissipated, and great guiding significance is achieved for design of energy absorption devices of various vehicles.

The invention discloses a composite energy absorption device, which comprises a sleeve, a base and an upper cover, the upper cover is connected to an energy absorption front end of the sleeve, the base is connected to an energy absorption rear end of an energy-absorbing sleeve, and the sleeve is filled with a honeycomb body; a plurality of spiral guide grooves which spirally extend in parallel around the central axis are formed in the wall of the sleeve, and notches which are connected with the spiral guide grooves in a one-to-one correspondence mode and have the same spiral angle are formed in the positions, corresponding to a pipe opening of the sleeve energy absorption rear end, to which the spiral guide grooves extend. The base is provided with a cone-frustum-shaped part, a plurality of blunt cutting edges are arranged on the circumference of the small-diameter end of the cone-frustum-shaped part at intervals, and when the sleeve is connected with the base, the blunt cutting edges are inserted into the notches in the one-to-one correspondence mode. The invention has the following advantages: the energy absorption process is stable, the specific energy absorption is high, and the collision peak force is small.

The invention relates to an internal torsion honeycomb structure material and a preparation method thereof, and belongs to the technical field of honeycomb materials. The internal torsion honeycomb structure material is composed of a plurality of internal torsion hexagonal honeycomb structure cell units which are arranged in a topological array mode, and the cross section of the outer layer cell wall of each internal torsion hexagonal honeycomb structure cell unit is in a regular hexagon shape. The inner-layer cell wall of each internally-twisted hexagonal honeycomb structure cell unit consists of twisted curved surfaces which are connected in sequence, and the adjacent internally-twisted hexagonal honeycomb structure cell units share the outer-layer cell wall. According to the invention, the inner-layer cell wall of the hexagonal honeycomb is twisted, and the energy absorption characteristic and the specific stiffness performance of the honeycomb structure are regulated and controlled by adjusting the process parameters such as the twisting angle, the cell thickness, the side length, the height and the like; compared with a traditional hexagonal honeycomb structure material, the internal torsion honeycomb structure material has higher specific energy absorption and specific stiffness.

The invention relates to a four-cell metal tube for scientific research. The our-cell metal tube for scientific research comprises a body, where the body is a conic thin-wall tube, the body is internally provided with a crossed tube wall, the tube wall extends from the top end of the body to the bottom end, the middle portion of the body is provided with an inner-concave preformed deformation groove, an upper portion of the preformed deformation groove is provided with an upper acceleration sensor, a lower portion of the preformed deformation groove is provided with a lower acceleration sensor, and the upper acceleration sensor and the lower acceleration sensor are respectively provided with leads for transmitting signals out. According to the four-cell metal tube, after the acceleration sensors are arranged at different positions, speed change of different portions in a deformation process can be tested respectively, an actual deformation process is detected, and better bases are provided for scientific research.

The invention discloses a preparation method of a lattice structure metamaterial based on liquid metal. The preparation method comprises the following steps: carrying out light curing molding on lattice units by adopting waxy photosensitive resin, and carrying out 3D printing by combining with a DLP additive manufacturing process to obtain a waxy lattice unit model; the wax lattice unit model is covered with gypsum mortar and a cylindrical high-temperature-resistant shell and placed at the normal temperature till gypsum is hardened; heating the product in a high-temperature heating furnace until the wax lattice unit model is completely vaporized and an internal porous runner is formed; liquid metal is poured into the wax lattice unit model until the porous runner is fully filled, and a metal lattice structure core is obtained; a super-elastic silica gel shell is formed in an immersion coating mode; carrying out curing treatment on the Falz metal lattice structure subjected to film coating; the prepared lattice structure metamaterial based on the liquid metal can achieve the shape memory function of external force and temperature regulation and control, and due to the external elastic layer, the function of recovery after repeated strain bearing can be achieved.

The invention relates to the technical field of honeycomb structures and particularly relates to a multi-stage honeycomb structure and a design method. The cell wall of the multi-stage honeycomb structure comprises cell walls of a plurality of first-stage honeycomb cell elements which are connected to replace honeycomb cell elements; first-stage real nodes are replaced by second-stage honeycomb cell elements; the whole structure meets the limitation of parameters of the multi-stage structure; compared with the traditional honeycomb structure, the energy absorption performance is higher when working conditions, masses and volumes are same; according to the design method, the cell walls of the honeycomb cells are replaced by the plurality of first-stage honeycomb cells which are connected, the first-stage real nodes are replaced by the second-stage honeycomb cells; various multi-stage structure parameters are introduced, so that the geometric configuration of the multi-stage honeycomb structure can be conveniently adjusted; the large-range regulation and control of the energy absorption performance of the honeycomb structure can be realized; and engineering requirements can be met. Compared with the traditional honeycomb structure, the designed multi-stage honeycomb structure has higher specific energy absorption when the working conditions, the masses and the volumes are same.