139results about How to "Improve structural mechanical properties" patented technology

The invention relates to an acellular biological patch, a preparation method and an apparatus thereof. In the invention, small intestines of pigs are taken as raw materials, which are subjected to a series of decellularization treatment by means of an acid, hydrogen peroxide, a mixed solution of high salt and alkali so as to obtain the acellular biological patch. According to the preparation method, after treatment by the hydrogen peroxide, the mixed solution of high salt and alkali can be employed to conduct twice recycling treatment, thus reaching the effects of thorough decellularization and antigen removal. The employment of a transverse and longitudinal alternating laying way maintains uniformity of the patch's mechanical properties, the tensile strength, suture tear force, tear strength and other mechanical indexes can well meet clinical demands, thus facilitating surgical suture operation. The employed drying mode has no need of any adhesive and suture line for fixation, so that a natural three-dimensional support structure of the product is maintained, and after implantation into the human body, no strong inflammatory response and immunological rejection response can occur. The patch has no toxicity on cells, so that infection and adhesion cannot occur in a repair process. The acellular biological patch provided in the invention is suitable for repair of body tissue defects and soft tissue injuries, and also can be used in the bioengineering field to serve as the tissue for reinforcing repair of membranous defects and infected wounds and serve as a biological scaffold material, etc.

The invention discloses a laser-assisted prestressed composite method for shot blasting, forming and strengthening. The method is as follows: firstly, a workpiece is deformed as expected in an elastic range through a mechanical preloading method; secondly, the elastic energy concentration region of a part is scanned with a laser beam; thirdly, shot blasting is carried out to the workpiece along a laser scanning path. When the method is adopted for forming, the thermal effect of the interaction between the laser and a material can reduce the deformation resistance (elastic modulus and yield strength) of the material in a laser action region, and can assist the part in shaping through an inhomogeneous thermal stress field established in the thickness direction of the part, thereby the compression bending forming amount, forming efficiency and forming precision of a shaped part can be remarkably improved; moreover, the shot blasting immediately carried out later can strengthen the strain of a heat action region, so as to improve structural mechanical property.

The invention discloses a structurally ordered chitosan/nanocellulose composite aerogel and a preparation method thereof. The preparation method comprises the following steps of: mixing a chitosan solution with a cross-linking agent, heating to form hydrogel, and carrying out oriented freezing on the chitosan hydrogel until the chitosan hydrogel is completely solid, then, performing drying to obtain chitosan aerogel, and soaking the chitosan aerogel in the nano-cellulose dispersion liquid, and carrying out freeze drying to obtain the chitosan/nano-cellulose composite aerogel constructed by a long-range ordered structure and a honeycomb structure. The chitosan/nanocellulose composite aerogel has an ordered structure combining long-range ordering and a honeycomb network, has the properties of small density, low thermal conductivity, excellent compression resilience and the like, belongs to the field of aerogel material preparation, and can be applied to the fields of thermal insulation,tissue engineering and the like.

The invention discloses a novel large-span load-bearing prestress double-T plate construction method. The method comprises the steps that firstly, a double-T plate formwork structure is provided and comprises a shaped formwork frame and two ribbed beam end formworks, wherein double-T-shaped pouring channels are formed in the shaped formwork frame, and the two ribbed beam end formworks seal the two ends of the double-T-shaped pouring channels; each ribbed beam end formwork comprises a horizontal rib pressing plate, two vertical rib connecting plates and locating plates, wherein the two vertical rib connecting plates are arranged at the bottom of the horizontal rib pressing plate in a supporting mode, the locating plates are detachably connected to the bottoms of the vertical rib connecting plates, and each locating plate is provided with a plurality of tensioning holes used for penetration of reinforcing bars; secondly, long-line arrangement is conducted on the double-T plate formwork structure, and tensioning pedestals are arranged at the two ends of the double-T plate formwork structure; thirdly, the reinforcing bars penetrate through the tensioning holes in the locating plates, and reinforcing bar nets and embedded parts are arranged; fourthly, the reinforcing bars are subjected to prestress tension; fifthly, after the prestress of the reinforcing bars meets the strength requirement, concrete is poured into the double-T-shaped pouring channels; sixthly, after pouring is completed, concrete curing is conducted; seventhly, after curing is completed, the reinforcing bars are released, the double-T plate formwork structure is dismantled after the reinforcing bars are released, and then a double-T plate is made.

The invention belongs to the technical field of automobiles, and particularly relates to a forecasting method for transmission intermediate shaft limit bearing capacity. According to the invention, the method includes defining material nonlinearity and contact nonlinearity of parts; defining boundary conditions on a bearing outer ring; loading the gear meshing force to the gear meshing node; trulyreproducing the stress state of the intermediate shaft; obtaining a high-precision intermediate shaft gear engagement node rotation angle and intermediate shaft transmission torque relation curve; onthe basis, the curve slope ratio is adopted to accurately forecast the fracture limit bearing torque of the intermediate shaft, the simulation replacement test of the fracture limit bearing torque ofthe intermediate shaft is realized, the product development cost is reduced, and the problem of obtaining the limit bearing capacity of the intermediate shaft of the transmission at present is solved.

The invention discloses a high bearing capacity prestressed pipe pile and relative producing method. The invention can overcome the thickness limit of wall of present technique via a plurality of filling and de-centering concrete to produce practical pipe pile even sincere post. With the increase of wall thickness of post, the forced surface of pipe pile and the structure mechanical property are improved. The tests prove that: the bearing ability of single post is improved significantly, with strong penetrate ability to rigid stratum and reduced post-explosion condition. The invention has simple process, reliable quality, and better market prospect.

The invention discloses a method for forecasting the ultimate bearing capacity of a transmission shell under the impact action of an engine, which fully utilizes the advantages of short linear elasticfinite element analysis and calculation period, accurate static safety coefficient prediction structure fracture position and the like to quickly determine a plurality of strength weak positions of the transmission shell. Through elastic-plastic finite element analysis, plastic strain of multiple strength weak positions of the transmission shell is calculated, the minimum torque in the multiple strength weak positions when the plastic strain is equal to the elongation of a material serves as a transmission shell fracture criterion, and the ultimate bearing capacity of the transmission shell is forecasted; due to the fact that the material elongation is plastic strain during structural fracture and has strong correspondence with structural fracture, the limit bearing capacity of the transmission shell is evaluated more accurately and more precisely by adopting the material elongation.

The invention relates to a sleeve connecting method. A continuous fiber reinforcement fabric sleeve is arranged on components needing to be connected in a sleeving manner, then resin is coated or a resin coating is pasted so that the fabric sleeve is soaked with the resin, or a continuous fiber reinforcement fabric resin prepreg sleeve is arranged on the components needing to be connected in a sleeving manner, and finally a vacuum bag or a plastic sleeve contracting after heating is used for solidification so as to enable the connecting position of the components needing to be connected to be covered with a continuous fiber reinforcement composite material. The invention further discloses a connecting product which is obtained through the above sleeve connecting method and is at least provided with the connecting position covered with the continuous fiber reinforcement composite material. According to the sleeve connecting method and the product, the components needing to be connected serve as mandrels of the final product, the development cost for dies is saved, the advantage that the fabric sleeve is deformable is sufficiently used, connection between the different components can be good, and the components can be connected in a clamping manner; and a load-carrying structure of the composite material of the sleeve acts and can serve as a main load-carrying structure, so that the production cost is reduced, and the process of the product is simplified.

The invention relates to a box-type lower floating body multi-stand-column-type semi-submersible platform. The box-type lower floating body multi-stand-column-type semi-submersible platform comprises a lower floating body. The upper portion of the lower floating body is connected to an upper platform through multiple stand columns. The lower floating body is parallel to the upper platform. The lower surface of the upper platform is parallel to the water surface. The upper surface of the upper platform is provided with a superstructure. A helicopter take-off and landing area is arranged on a deck located on the upper platform. An anchoring system is arranged on the platform. The box-type lower floating body multi-stand-column-type semi-submersible platform is compact and reasonable in structure, convenient to manufacture and install, suitable for deep and far sea environment, and applicable to the large size due to the facts that the lower floating body box-type through and multi-stand-column-type semi-submersible platform is adopted, and the lower floating body is a box-type body and is connected with the upper platform through the stand columns.

The invention provides a preparation method of an anti-seepage delivery water of a channel, relates to the preparation method of a U-shaped/rectangular water tank for water delivery in irrigation and water conservancy, and is used for solving the problems of rough surface, poor freezing resistance and poor durability of a U-shaped tank and a trapezoid tank which are obtained by the existing preparation method. The preparation method provided by the invention comprises the following steps: 1, preparing raw materials; 2, evenly stirring the raw materials in a stirrer and then pouring into a mould; vibrating the mould of the anti-seepage water delivery tank on a suspension-type vibration platform for finishing the material distribution vibration moulding of the concrete raw materials; 3, transporting the mould carried with a concrete water tank into a curing kiln for steam curing and then transferring the mould from the curing kiln; and 4, demoulding the anti-seepage water delivery tank, thus finishing the preparation of the anti-seepage water delivery tank of a channel. According to the method, the overall vibration treatment of the concrete raw materials in the mould is carried out by adopting the vibration platform, so that the concrete has the advantages of uniform quality, smooth surface and good structural mechanical property and the concrete parameter of the concrete can reach a C50F300 level.

The invention discloses a fabricated specially-shaped roof structural system and a construction method thereof. The fabricated specially-shaped roof structural system comprises multiple prefabricatedassembling units of independent structures, wherein the multiple prefabricated assembling units are disposed according to a predetermined order; two adjacent prefabricated assembling units are connected in a fabricated manner; each of the prefabricated assembling units comprises a polygonal-structured frame body; a first connection plate and a second connection plate are respectively arranged on apair of opened surfaces of the frame body; the first connection plate and the second connection plate are fixedly connected with the frame body respectively; a filling body is arranged among the first connection plate, the second connection plate and the frame body; the frame body comprises multiple assembling ribbed plates connected end to end; and mounting holes for connection are formed in theassembling ribbed plates. The fabricated specially-shaped roof structural system is reasonable in structural stress and high in structural rigidity; a node can be simplified; an internal force is uniformly distributed, and a spatial effect is obvious; the construction period can be shortened; the weight of the structure is reduced; materials and energy are saved, so the whole construction cost isreduced; and the fabricated specially-shaped roof structural system is high in practicability and worthy of being popularized.

The invention discloses a modular space truss structure light semi-submersible suspension cable deep sea net cage. The net cage is characterized in that a net cage framework is modularly constructed and expanded by truss nodes and truss rod pieces, and comprises a top surface truss, a semi-submersible truss arranged on the top surface truss, and a bottom surface truss; the top surface truss and the bottom surface truss are multilayer trusses in the inner and outer directions and comprise buoyancy adjustable layers and buoyancy non-adjustable layers; the semi-submersible truss comprises a buoyancy adjustable layer; and a plurality of groups of suspension cables are included and are arranged between the top surface truss and the bottom surface truss. The net cage framework is constructed ina modular design mode, the multi-layer truss structure meets the requirement for good strength and safety, the unit use cost of equipment is greatly reduced, and a road is laid for large-scale offshore culture; through active adjustment of buoyancy adjustable points, the top surface truss and the bottom surface truss have the active approaching and folding functions, rapid contraction of the netting and the culture space is achieved, rapid fish collection or transfer is achieved in cooperation with pumping, and external disasters such as storms are avoided.

The invention discloses a manufacturing method for ribbed FRP members. The method comprises the following steps: manufacturing basic FRP splicing blocks; forming bolt holes in the basic FRP splicing blocks; placing the basic FRP splicing blocks according to a certain sequence, and mounting bolts or end bolts in the bolt holes of the adjacent basic FRP splicing blocks; regularly arranging glue injection nozzles in gaps between the adjacent basic FRP splicing blocks, and performing edge sealing processing for the peripheries of the gaps at splicing positions of the adjacent basic FRP splicing blocks; injecting glue into the gaps in the splicing positions of the adjacent basic FRP splicing blocks through the glue injection nozzles; after the glue is solidified, dismantling or retaining the bolts and end bolts; after the glue is fully solidified and reach a certain strength, forming horizontal through holes in FRP longitudinal plate ribs formed by the adjacent basic FRP splicing blocks. The ribbed FRP members in size is not limited by sizes of the basic FRP splicing blocks, and can be freely spliced according to the actual size required by the construction site, so that the advantages that manufacturing and construction are simple and convenient, the construction speed is fast, the structural mechanics performance is excellent and the economic performance is considerable are achieved.

A parallel type underwater vectored thruster mainly comprises a machine frame, a turning machine and three movement branch chains for connecting the machine frame with the turning machine. Each movement branch chain is composed of a lower connection rod, a middle connection rod and an upper connection rod, wherein the lower connection rod and the machine frame are connected through a rotary pair or a sphere pair; the lower connection rod and the middle connection rod are connected through a rotary pair or a sphere pair; the middle connection rod and the upper connection rod are connected through a rotary pair; and the upper connection rod and the turning machine are connected through a rotary pair or a sphere pair. The three movement branch chains are connected with one another through three coupling connection rods and one center connection rod, one end of each coupling connection rod is fixedly connected with the middle connection rod of the corresponding movement branch chain, and the other end of each coupling connection rod is connected with the center connection rod through a rotary pair. Two-freedom-degree rotation of the turning machine relative to the machine frame can be achieved, the parallel type underwater vectored thruster has the advantages of being small in size, large in rigidity, high in precision, large in rotary working space and the like, and the parallel type underwater vectored thruster can be widely applied to ship thrust systems.

The invention discloses a barrel type paper folding rebounding mechanism containing an interval structure. The barrel type paper folding rebounding mechanism is formed by folding planar materials according to specifically-designed folds and has certain rigidity and elasticity, and when the barrel type paper folding rebounding mechanism is axially extruded, the barrel type paper folding reboundingmechanism generates compression deformation in the axial direction, and meanwhile generates rebounding force. The rebounding mechanism is novel in structure, easy and convenient to manufacture, low incost, good in mechanical performance and convenient to transport.

The invention discloses a PBL stiffening rectangular steel tube concrete space truss. The concrete space truss comprises a top bracing and a bottom bracing arranged just below the top bracing, wherein the top bracing and the bottom bracing are distributed in parallel; the top bracing comprises a plurality of top chords and a plurality of upper connection rods connected with each two adjacent top chords; the bottom bracing comprises a plurality of bottom chords and a plurality of lower connection rods connected with each two adjacent bottom chords; the plurality of top chords and the plurality of bottom chords are distributed in a staggered manner; each bottom chord is fixedly connected with two top chords at the left side and the right side above through a plurality of web members; the plurality of top chords and the plurality of bottom chords are PBL stiffening chords; each PBL stiffening chord comprises a square steel tube I, four PBL stiffening plates and an inner-pipe concrete structure. The concrete space truss is simple in structure, convenient to process, fabricate and construct and excellent in structural mechanical property, and has a good using effect, and a plurality of problems of an existing truss structure can be effectively solved.

The invention relates to a pre-tensioning method broken-line reinforcement idler wheel bending device shaped like a Chinese character ''fei''. The pre-tensioning method broken-line reinforcement idlerwheel bending device comprises an idler wheel bending device shaped like the Chinese character ''fei'', a mounting base, an anchor bolt and a connecting device connecting the idler wheel bending device shaped like the Chinese character ''fei'' with the mounting base, wherein the idler wheel bending device shaped like the Chinese character ''fei'' comprises a supporting pipe, idler wheels and fixing bolts; the supporting pipe is a round pipe, a base mounting blind hole connected with the upper end of a connecting rod is formed in the bottom of the supporting pipe, and a row of n mounting holesthrough which screws of the fixing bolts penetrate are formed in the upper part of the supporting pipe; and grooves are formed in the middles of the idler wheels, circular holes are formed in the centers of the cross sections of the idler wheels, and idler wheel spacer bushes are installed in the circular holes in a sleeved mode. In the state of installation and use, the screws of the fixing bolts penetrate through the mounting holes in the round pipe, and the idler wheels are installed at the two ends of the screws correspondingly in a sleeving mode. The idler wheels are locked by the head portions of lock nuts and the fixing bolts, and the round pipe and the two rows of idler wheels form a shape like the Chinese character ''fei''. The bending device can avoid the bending point and breaking point effect, protects pre-stressed ribs from being bitten or indented, has convenient construction and good structural mechanical properties, and can prevent the pre-stressed ribs from slipping out.

The invention relates to a hip joint replacement prosthesis. The hip joint replacement prosthesis comprises a femoral stem (1) and a femoral neck (2). The hip joint replacement prosthesis is characterized in that the tail end of the lower part of the femoral neck (2) is formed by two parts, one part is an elastic barb (4) and the other part is a cylindrical object (5), and an interval gap (6) is arranged between the elastic barb (4) and the cylindrical object (5). The head of the femoral stem (1) is internally provided with an L-shaped hole (7). The lower part of the femoral neck (2) is plugged in the L-shaped hole (7), and the elastic barb (4) is hooked and clamped in a horizontal hole (9) of the L-shaped hole (7). The surface of the lower part of the femoral stem (1) is attached with raised edges (11) made of a hierarchical porous material. The hip joint replacement prosthesis is reasonable in structure design, and has relatively high connection stability and biocompatibility after being implanted.

The invention discloses a heat-insulation weather-resistant coextru-lamination totally-coated metal profile biomimetic material. The material comprises a metal bone profile, a main material composite inner layer and a main material weather-resistant skin layer; the main material composite inner layer is arranged outside the metal bone profile in a totally-coating mode, and the main material weather-resistant skin layer is integrally formed outside the main material composite inner layer in a co-extrusion mode; the cross section of the metal bone profile comprises a metal frame and a metal cover plate, and the metal frame is composed of a rectangular cavity and at least one special-shaped cavity in the middle; full filling is conducted on the exterior of the main material composite inner layer and the exterior of the metal bone profile, and multiple dovetail compomers are formed by the main material composite inner layer and the metal bone profile; the main material composite inner layer is provided with a composite material cover plate, a composite material frame body and a composite material baffle. According to the heat-insulation weather-resistant coextru-lamination totally-coated metal profile biomimetic material, the metal bone profile is totally coated with a composite material in an extruded mode, the heat insulation property reaches the level 6-11, the structural mechanical property is improved by multiple times, the slow fading or even unfading time is 10 years or above, and the linear expansion coefficient reaches 23*10<-5> mm/mm DEG C.

The invention relates to an artificial shoulder joint prosthesis. The artificial shoulder joint prosthesis comprises a humeral head (1) and a humeral handle (2), and is characterized in that a round hole (3) is arranged at the upper part of the humeral handle (2), wherein the lower handle body of the humeral handle (2) is composed of a body (4) and a coating layer (5) arranged at the outer layer of the body (4), and the coating layer (5) is made of a multi-level-hole material; through holes (6) are arranged in the handle body. The artificial shoulder joint prosthesis is reasonable in structural design, the selected materials are suitable and controllable and are uniform in height, after being implanted into the human body, the artificial shoulder joint prosthesis is high in connection stability and biocompatibility, and thus the postoperative quick recovery is facilitated.

A buckling-constrained support with embedded steel bars and outer-wrapped fiber tubes belongs to a new type of energy-dissipating shock-absorbing component, which can be applied to structural shock absorption and engineering reinforcement. In the present invention, a plurality of light round steel bars are straightened, aligned at both ends, combined into a certain cross-sectional shape, fiber cloth is wound around the end of the combined steel bar, and the outer surface of the combined steel bar between the fiber cloths is coated with silica gel material, and after the silica gel material is dried, Penetrate the constraining fiber tube, put the end reinforcement tube on the constraining fiber tube, and fix the two ends of the composite steel bar on the two end plates. Among them, at one end of the support, the constrained fiber tube is bonded to the end reinforcing tube through structural glue; at both ends of the support, two end reinforcing tubes are welded to the two end plates respectively. A buckling-constrained support with embedded steel bars and outer-wrapped fiber tubes has the advantages of strong energy dissipation, small cross-sectional size, light weight, flexible cross-sectional form, simple structure, convenient processing, and less waste, and has a wide range of applications, which can effectively solve the current structural problems There are many problems in shock absorption and engineering reinforcement.