49results about How to "Raise the stress value" patented technology

The invention relates to a method for manufacturing safe toughened vacuum glassm comprising the following steps of: (1) placing two ultrahigh-stress glass plates each provided with an air exhaust slot and having a stress value of 100-200 MPa on a platform, and cutting the glass plates to form the air exhaust slots; (2) arranging a support on the lower glass plate, placing a getter thereon, and arranging exhaust tubes in the air exhaust slots; (3) applying glass powder to the edges of the four sides of the lower glass plate, wherein the applied glass powder is less than 2 cm away from the edges; and putting the upper glass plate on the lower glass plate for combination; (4) delivering the combined two glass plates into a furnace, heating the glass plate to a range of 380 to 485 DEG C, and preserving heat for 25-35 minutes; and (5) performing vacuum supply when the temperature in the furnace ranges from 280 to 320 DEG C; and performing hot melting sealing when the value of negative pressure in the cavity of the glass reaches 10-1 to 10-2 Pa, thereby obtaining the toughened vacuum glass with the stress value of 85-95 MPa. The method is scientific in design and simple in process, and perfectly overcomes the problems difficult to be solved in the prior art and greatly expands the application fields of the vacuum glass; therefore, the method is a revolutionary technological innovation and must cause deep influence on the development of the vacuum glass.

The invention relates to high-strength wear-resistant flame-retardant polypropylene and a preparation method thereof. The polypropylene is prepared from the following components in parts by weight: 42-55 parts of a polypropylene base body, 20-29 parts of modified packing, 1-4 parts of boron nitride, 18-21 parts of additives, 1-3 parts of a phosphite antioxidant and 2-5 parts of dimethicone. The preparation method comprises the following steps: uniformly mixing the polypropylene base body, the modified packing, the boron nitride, the additive, the phosphite antioxidant and the dimethicone by virtue of a high speed mixer; adding the mixed material into a granulator to be granulated; and then adding aggregates into an injection moulding machine to prepare a sample so as to prepare the flame-retardant polypropylene. According to the flame-retardant polypropylene provided by the invention, various inorganic components are added to improve the flowability of a polymer and an inorganic packing system and enhance the toughening effect, and no bulking agents are used, so that the cost is lowered. The additives, glass fibers and a flame retardant are halogen-free materials, the preparation process is simple and convenient, the adopted materials are cheap, and the comprehensive cost is relatively remarkable in advantage compared with that of a conventional polypropylene composite material.

The present invention discloses a magnetic force effect-based parallel composite beam piezoelectric-electromagnetic energy capture device. The magnetic force effect-based parallel composite beam piezoelectric-electromagnetic energy capture device comprises a shell, two sets of composite beams which are parallel to each other, two permanent magnets and two induction coils; the two induction coils are disposed on the opposite inner side walls of the shell; the two sets of composite beams are disposed between the two induction coils; each set of composite beams comprises a plurality of cantilever beams and a base connected with one end of each of the plurality of cantilever beams, the other ends of the cantilever beams being fixedly connected onto the inner side wall of the shell; the two permanent magnets are arranged on the bases of the two sets of composite beams respectively and directly face the two induction coils respectively; and the upper and lower surfaces of the cantilever beams are provided with piezoelectric sheets. The piezoelectric power generating device of the present invention can be more adaptive to random, broadband, low-frequency, large-amplitude and high-intensity vibration energy recovery in the environment.

The invention relates to a nanofiber reinforced polyimide aerogel material and a preparation method thereof.Raw materials comprise water-soluble polyamide acid, polyimide nano short fiber, triethylamine, and water. The prepared polyimide aerogel is low in shrinkage rate, improvement of Young modulus is realized under the condition that the density is substantially unchanged, the comprehensive performance is excellent, the preparation process is simple and easy to operate, environment-friendly effect is achieved, and the application range of the polyimide aerogelis widened.

The invention provides an experimental method by simulating roadway crossed point strain rock burst. The experimental method comprises the steps of: providing a cuboid or cube rock sample test piece,loading three-directional initial stress onto six surfaces of the rock sample test piece, and keeping for 5-10 min; and, suddenly unloading the load acting on two opposite surfaces of the rock sampletest piece, so that the two opposite surfaces of the rock sample test piece form a free face, simulating the excavation unloading effect of a roadway crossed point rock body, observing the state of the rock sample test piece: if the rock sample test piece has rock burst damage, ending the experiment; and, if the rock sample test piece does not have rock burst damage, increasing the vertical direction stress value in two unloaded stresses till the rock sample test piece has rock burst damage. Experimental equipment used by the experimental method provided by the invention is true tri-axial rockburst experimental equipment capable of realizing rapid unloading two surfaces or multiple surfaces in the horizontal direction under a high-pressure state; and strain rock burst of a rock body at aroadway crossed point can be well simulated in the invention.

The invention relates to a preparation method of a carbon nano-tube reinforced foamed aluminum filled aluminum alloy pipe composite structure. The preparation method is implemented through the following steps of preparing composite powder uniformly loaded with carbon nano-tubes on the surface of aluminum powder; conducting mechanical ball milling; evenly mixing the ball-milled composite powder with urea and then conducting cold press molding; conducting water bathing on a cold pressed sample under 60-80 DEG C for 6-8 h to remove urea and then putting the sample in a drying oven to be dried after water bathing; putting the dried sample in a tube furnace to be heated to 650 DEG C under argon shielding of 200-300 ml / min at the rate of 5 DEG C / min, conducting sintering for 2-4 h, and then conducting furnace cooling to the indoor temperature after completion of sintering to obtain the carbon nano-tube reinforced foamed aluminum filled aluminum alloy pipe composite structure.

The invention discloses a wearable piezoelectric electromagnetic composite energy harvesting vibration device. An adopted composite beam obtains larger stress distribution and a larger stress value, and a piezoelectric film is adopted as a piezoelectric material of the composite beam and larger deformation can be borne such that more electric energy is generated; a cylindrical permanent magnet isfixed at a tail end of the composite beam and can be used as a mass block such that the resonant frequency of the composite beam can be reduced, and the adaptability of the composite beam to a low-frequency environment is higher; the permanent magnet can also be used as an electromagnetic energy harvesting oscillator to generate an electromagnetic energy harvesting effect together with a coil; dueto the coupling effect of piezoelectricity and electromagnetism, the defects that the output current of a piezoelectric device is small and the output voltage of an electromagnetic device is small are overcome, the output voltage is high, and the current is large.

The invention relates to an acoustic metamaterial, an acoustic vibration energy collector and electronic equipment. The acoustic metamaterial is of a periodic diamond crystal structure, the smallest repeating unit of the periodic diamond crystal structure is a lattice, each lattice comprises a truss unit, each truss unit comprises four straight-rod-shaped trusses that meet at a connection point, each truss extends outwardly from the connection point to form a section of cantilever, the surface of each cantilever is coated with a piezoelectric material layer, and the surface of each piezoelectric material layer is provided with a lead-out electrode. By utilizing the high absorption property of the specially designed acoustic metamaterial for acoustic waves in the bandgap frequency, the acoustic waves are efficiently converted into structural vibration of the material; and through attaching the piezoelectric materials to the near acoustic surface, far acoustic surface of the structure and the maximum deforming part inside the structure, the comprehensive and efficient collection of vibration energy is achieved, so as to provide instant energy for terminal equipment such as small portable electronic equipment and wireless micro-sensors.

The invention relates to a dieless hydraulic quasi-static thin-plate bulging deformation limit strain and load graphic calculation method. The method comprises the steps of taking dimensionless deflection as horizontal coordinates, taking an equivalent stress and an equivalent strain as left and right longitudinal coordinates, and drawing a united curve based on geometric and physical relationships, a curve cluster based on a static balance relationship and a strain-dimensionless deflection curve based on a geometric relationship in sequence; finding deformation, stress, strain and the like corresponding to an action static pressure load through a curve intersection point; and through a curve tangent point which is a tension instability point, obtaining a limit load corresponding to a balance relationship curve first and then finding a limit strain in the right longitudinal coordinates in combination with the strain-dimensionless deflection curve. The method has the beneficial effects that (1) solving is stable; (2) the method is suitable for other constitutive model materials; (3) the method can be used for solving deformation, stress and strain in a loading process; (4) the calculation process is simple and clear and is definite in physical significance; and (5) the maximum deflection and the maximum stress value can be obtained.

Disclosed is an ion implantation process for reinforcing bearing steel ball surface of GCr15 by using nitrogen and titanium as implantation elements which are implanted by employing a linear-beam high-current double-element ion implanter. The invention employs monoenergetic mode with implantation energy of 100KeV (kilo electron volt). Titanium is implanted and then nitrogen is implanted, implantation dose is controlled within 2.0 to 3.0*10 17 Ti+2.0 to 3.0 *10 17 N, linear ion beams are implanted in a steel ball with a curved surface, steel balls with different diameters produce different refraction effects, thereby the implantation dose needs to be adjusted within the implantation dose range according to the real sizes and properties of the steel balls, ensuring the concentration of nitrogen ion implanted on the surface of the steel ball over 18%, the concentration of titanium ion over 10% and uniformity over 85%. The employment of the implantation process is capable of guaranteeing the depth, concentration and uniformity of ion implantation of the surface of the steel ball, and thereby the steel ball surface has the advantages of relatively high hardness, relatively good corrosion resistance and abrasion resistant properties, relatively long endurance life and relatively high reliability.

The invention discloses an isosceles trapezoid cantilever beam-based piezoelectric-electromagnetic energy capture device, which comprises a base, wherein the base is in a form of a regular polygon; each edge is provided with a cantilever beam; the cantilever beams are in a form of an isosceles trapezoid, the bottom edges of the cantilever beams are fixedly connected with the corresponding edges of the base and the cantilever beams and the base are located in the same plane; each cantilever beam is provided with a piezoelectric plate; the upper surface and the lower surface, far away from the base, of each cantilever beam are provided with a first permanent magnet and a second permanent magnet respectively; each first permanent magnet is provided with a first induction coil; a second induction coil is arranged at the lower part of each second permanent magnet; each first induction coil is fixedly connected with the corresponding second induction coil through a connecting rod; each first induction coil is provided with a fixed pulley; each fixed pulley is provided with a connection line; and one end of each connection line is connected with the corresponding first induction coil and the other end is connected with the corresponding first permanent magnet. The isosceles trapezoid cantilever beam-based piezoelectric-electromagnetic energy capture device can adapt to random broadband low-frequency, large-amplitude and high-strength vibration in the environment; and the energy recovery efficiency is high.

The invention relates to a molten salt impurity removal method suitable for chemical tempering production and a method for improving glass strength. The molten salt impurity removal method suitable for chemical tempering production comprises the following steps: adjusting the pH value of molten salt to 9-14; adding a precipitant into the molten salt, performing mixing treatment to enable the precipitant to react with impurity ions in the molten salt to generate precipitate, and adjusting the pH value of the molten salt to 6.8-7.2; and adding an adsorbent, and standing to clarify the molten salt. The molten salt impurity removal method for chemical tempering production is simple to operate, and experiments prove that the effect of removing impurities from molten salt by adopting the methodis obviously better than that of a traditional molten salt impurity removal method.

The invention discloses an optimization method and system for a vehicle storage battery bracket. The method comprises a step of acquiring model data of the storage battery bracket, a step of importingthe model data into Hypermesh for mesh division and establishing a finite element calculation model, a step of importing the finite element calculation model into ANSYS for modal analysis to obtain amaximum stress value of the storage battery bracket, a step of judging whether the maximum stress value reaches a yield limit or not, and a step of optimizing the storage battery bracket through an optistruct model if not to achieve a light weight. According to the method and the system, topology optimization is carried out by using opiterruc, a new design and an optimal solution can be providedfor a designer, topology optimization is based on the idea of a conceptual design, a shape and quality are optimized under the premise of satisfying an intensity, the purpose of the light weight isachieved, the work cycle is greatly reduced, and the development cost is reduced.

The invention relates to a closed pore CNTs / Al-Si composite foamed material. The closed pore CNTs / Al-Si composite foamed material comprises, by weight, 5%-25% of silicon powder, 0-5% of magnesium powder, 0.15%-1.5% of TiH2 powder and the balance CNTs / Al powder obtained through in-situ chemical vapor deposition. The preparation method includes the steps that the in-situ CNTs / Al powder is subjectedto mechanical ball milling; the CNTs / Al powder obtained through ball grinding is mixed with the silicon powder, the magnesium powder and a foaming agent in a stirring machine; the mixed powder is subjected to cold-press molding, so that a cylindrical precast block is obtained; and the precast block is put into a cylindrical steel mold of a resistance furnace for fast foaming, and accordingly the closed pore CNTs / Al-Si composite foamed material can be obtained. According to the closed pore CNTs / Al-Si composite foamed material, foam pores are evenly distributed, and the size dimensions are uniform; and full-closed holes are formed, the strain rate sensitive effect is low, and the compression stress-strain curve has an obvious platform region. The foamed aluminum material product prepared through the method is stable in quality and excellent in performance, the preparation process is simple and the technological process is fast.

The invention relates to a steel cable prestressed glass curtain wall, which solves the problem that a courtyard or a corridor and the like cannot be included in a shielding range of an external enclosure structure in the prior art. The glass curtain wall comprises glass serving as a surface material and a support system consisting of a steel structure and a pull cable. The technical key point isthat: the steel structure is mainly formed by assembling a prestressed steel beam, a vertical pull rod and a horizontal steel beam; a base of the prestressed steel beam base is positioned by an anchor plate; the upper and lower ends of the base are supported by pressing rod steel beams; the pull cable which is tensioned under the action of a tensioner is arranged between the two pressing rod steel beams; and a complete prestressed support system is formed by the parts. The glass curtain wall has a reasonable design and a compact structure, saves materials and is easy to install and convenientto maintain, a set distance can be formed between the external enclosure structure and a main body structure of the glass curtain wall, and the courtyard or the corridor and the like can be included in the shielding range of the external enclosure structure; meanwhile, the permeability of the glass curtain wall is ensured, and effects of perfectly combining building art with a practical technology and obviously improving an external decoration effect are achieved.

The invention provides an ion exchange enhancement method of laser glass. The method comprises the following steps: S1, ion exchange: carrying out ion exchange treatment of the laser glass by using mixed molten salt formed by a mixture of RbNO3 and CsNO3; S2, surface heat treatment: carrying out rapid heat treatment of the laser glass after being subjected to ion exchange in the step S1 by using mixed molten salt formed by a mixture of NaNO3 and LiNO3; and S3, surface acid treatment: carrying out surface acid treatment of the laser glass after subjected to surface heat treatment in the step S2by using mixed acid formed by a mixture of any two of HCl, H2SO4 and CH3CH2COOH or a mixture of HCl, H2SO4 and CH3CH2COOH. A pressure stress layer with higher stress value and deeper depth can be formed on the surface of the laser glass treated by the method; meanwhile, the stress relaxation time is longer; the chemical stability is greatly improved; the laser glass has higher microhardness, fracture resistance and brittleness temperature and stronger water resistance.

The invention belongs to the technical field of metamaterial structures, and discloses a three-dimensional negative Poisson's ratio structure, an additive manufacturing method, a 3D printer and an application, and the isotropic three-dimensional negative Poisson's ratio structure is obtained by arraying a plurality of basic unit bodies. Each unit body is provided with a hollow inner concave body and six connecting bridges; eight vertexes of the hollow inner concave body are in the shape of a triangular bearing table in three directions respectively, and the middles of the six inner concave surfaces are in the shape of a square bearing table; and one ends of the six connecting bridges are connected with the square bearing table in the middles of the inner concave surfaces, and the other ends extend out of the hollow inner concave bodies. The three-dimensional negative Poisson's ratio structure with the isotropic height in each direction is highly symmetrical in each direction, does not show mechanical property difference due to different directions, has the characteristics of isotropic height in each direction and good multi-working-condition penetration resistance, and can show a negative Poisson's ratio effect in each direction.

The invention relates to a preparation method of foamed aluminum reinforced by synergism of carbon nano tubes and alumina particles. The preparation method comprises the steps of dissolving aluminum oxide powder and cobalt-nitrate hexahydrate according to the mass ratio being 20 to 40:1 into absolute ethyl alcohol, continuously stirring in water-bath heating until ethyl alcohol is volatilized completely, drying an obtained mixture in a drying oven, putting obtained completely dried powder into a tube furnace, rising the temperature to 250 DEG C under the protection of argon, switching to the hydrogen atmosphere, and preserving heat at 250 DEG C and 450 DEG C; then closing hydrogen, rising the temperature to 600 DEG C under the protection of argon, feeding mixed gas of acetylene and the argon according to the proportion of the acetylene and the argon being 1:12, reacting at 600 DEG C, finally closing the mixed gas, cooling to the room temperature under the protection of the argon, and obtaining composite powder with the carbon nano tubes uniformly loaded on the surfaces of the alumina particles; ball milling; uniformly mixing ball-milled powder and urea; removing the urea, and drying; and sintering.

The invention provides a manufacturing method of a display screen cover plate. The manufacturing method comprises the steps of (1) heating glass to a temperature corresponding to a viscosity value of10<10>-10<8>Pa.s; (2) synchronously quenching the tin surface and the air surface of the glass by using cooling media with different temperatures, and stopping quenching when the temperature of the glass is quenched to a temperature range corresponding to the viscosity value of 10<13.6>-10<12.4>Pa.s; (3) heating the dried pure nitrogen until the temperature is 40-70 DEG C lower than the temperature corresponding to the viscosity value of 10<13.6>Pa.s, and purging and cleaning the two sides of the glass with nitrogen until the temperature of the glass is equal to the temperature of the nitrogen; (4) heating potassium nitrate of which the purity is greater than 99.9% to the temperature of the nitrogen to form potassium nitrate molten salt, then immersing the glass into the potassium nitratemolten salt for ion exchange, and annealing to room temperature after the ion exchange is finished; and (5) conducting cleaning, drying and the like to obtain the display screen cover plate. The method has the advantages that the glass does not need to be ground, and the chemical strengthening strength of the glass cannot be reduced.

The invention relates to a nanofiber-reinforced polyimide airgel material and a preparation method thereof. The raw materials include: water-soluble polyamic acid, polyimide nano-short fibers, triethylamine and water. The polyimide airgel prepared by the present invention has a low shrinkage rate, and its Young's modulus is improved under the condition that the density is basically unchanged, and its comprehensive performance is excellent. The scope of application of polyimide airgel.

The invention discloses a safe spanner structure, a spanner body thereof mainly comprises a head part and a handle part, the head part is connected with the handle part, and the handle part comprises a first rod body and a second rod body, the first rod body is thicker than the second rod body, the length of first rod body is defined as L1 and the length of the second rod body is defined as L2; a first space and a second space are arranged inside the handle part, the first space and the second space are intercommunicated, the length and the inner diameter of the first space are defined as L and Phi A respectively, the length and the inner diameter of the second space are defined as L3 and Phi B respectively; L1 is more than L, L2 is more than L3, and Phi A is more than Phi B; owing to the first space and the second space which are arranged at the handle part, the body is light and in a non-solid state, so slow flexure effect is produced after an excess force application, which can warn the users to protect safety. The safe spanner structure prevents the users from falling off caused by losing balance owing to the application of a force when the body is to be damaged.

The invention provides a method for reducing surface remained stress of high-power pulse laser cleaned metal, and belongs to the technical field of laser cleaning. Water base mixed liquid consisting of sodium metasilicate and gamma-glycidyl oxy-propyl trimethoxy silane is firstly provided; the water base mixed liquid is sprayed to the surfaces of metal after cleaning of pollutants on the surfacesof the metal by high-power short-pulse laser; low-power laser is selected for laser scanning cleaning by an S-shaped scanning path; the average power of the laser is 50-150 W; and the peak power density of the pulse laser is 1.0*107-4.0*107 W / cm2. The method can prominently reduce the surface remained stress of the high-power short-pulse laser cleaned metal. The method has the prominent characteristics of simple and practical process, low cost and continuous operation.