67results about How to "Reliable mechanical properties" patented technology

The invention discloses an assembling type steel tube concrete combination column which comprises two column segments. Each column segment comprises a steel tube and a steel reinforcement cage distributed outside the steel tube, wherein the steel tube is filled with concrete, the steel tube and the steel reinforcement cage are cast by concrete so as to form exterior concrete. The first steel tube is provided with a plugging portion stretching out of a first matching face of a first exterior concrete portion. A first longitudinal steel reinforcement bar is provided with a reserved segment stretching out of the first matching face. One end of the second steel tube is fixedly connected with a steel sleeve. A first slot is formed in the steel sleeve. One end of a second longitudinal steel reinforcement bar is fixedly connected with a steel sleeve. A second slot is formed in the steel sleeve. The first matching face of the first column segment is opposite to the second matching face of the second external concrete portion. The plugging portion is plugged into the first slot of the steel sleeve, the reserved segment is plugged into the second slot of the steel sleeve, and sizing materials are injected into a gap between the plugging portion and the steel sleeve and a gap between the reserved segment and the steel sleeve. The assembling type steel tube concrete combination column has the advantages that the two column segments can be prefabricated, the manufacturing precision can be improved, the construction period is shortened, and the mechanical performance is reliable.

The invention relates to a material testing equipment, in particular, it relates to a hydrogen storage alloy testing equipment. It is formed from reaction chamber, hydrogen gas circulation system and liquor circulation system, in which between reaction chamber and hydrogen gas circulation system a quick joint is used to implement closed connection, the hydrogen gas circulation system can make the hydrogen gas be continuously circulated between the reaction chamber and hydrogen gas circulation system, and said liquid circulation system can make the constant temperature liquids with different temperatures be alternatively circulated between the opened container and oil bath so as to make the hydrogen storage alloy implement alternative circulation of absorbing and releasing hydrogen. In the course of hydrogen gas and liquid circulation the control and data acquisition system can be used for acquiring and processing data, and outputting signal to control system to make test.

The invention discloses a device for testing the rigidity of a plate spring in a high-temperature environment. The current testing method is poor in testing precision, cockamamie in process and poor in universality as the current testing method is carried out after a spiral spring high-temperature testing device is transformed according to the structure and the shape of the plate spring. The device comprises a clamping device used for clamping the plate spring, a force testing device used for testing plate spring bearing loads, a lifting device used for regulating the position of the force testing device, a deflection measuring device used for measuring the deformation amount of the plate spring, a regulating device used for regulating the positions of stress action points of the plate spring, and an electromagnetic induction heating device used for stimulating the working temperature of the plate spring. With the adoption of the device for testing the rigidity of the plate spring in the high-temperature environment, the continuous measurement on different deflections and different stress action points can be realized; and the device is convenient to operate and reliable in test.

We present an invention on the synthesis of elastic, bio-compatible functional microstructures wherein the designed electrical functionalities are achieved by mixing conducting nano to micro-particles with PDMS gels. The methodology for constructing planar and three-dimensional microstructures by soft-lithographic technique is presented. Applications such as electrodes, conducting strips, two and three-dimensional microstructures for electrical wiring connections, micro heaters, micro heater arrays, flexible thermochromic displays, and applications for microfluidic devices are demonstrated, all with demonstrated elastic flexibility and fall-proof characteristics while maintaining their functionalities. Results obtained are very promising for the utilization of such composites in future micro-fabrications, especially for the bio-chips and microfluidic devices.

The invention discloses a 3D printed Ti-PDA-PLGA microsphere bone defect repair stent. A 3D printed Ti stent is prepared by a laser sintering technology. Then, under certain conditions, dopamine is self-polymerized on the fiber surface of the 3D printed Ti stent to form a PDA coating, thereby preparing a 3D printed Ti-PDA stent; then PLGA microspheres carrying VEGF are prepared by a double emulsion-solvent evaporation method, and finally, BMP-2 and PLGA microspheres carrying VEGF are adsorbed and immobilized on the surface of the stent by an adsorption method, and finally the 3D printed Ti-PDA-PLGA microsphere bone defect repair stent is formed. The bone defect repair tissue engineering stent disclosed by the invention has the advantages of reliable mechanical property, high biological activity and safety, convenient implantation, small trauma and low cost, and can be used for the repair treatment of bone defect after bone traumas, bone tumors and bone infection.

The invention discloses a tunnel advanced detection speed modeling method based on a reflected signal, and the method comprises the steps: obtaining X and Z component seismic signals through a conventional linear observation system; determining an i-th X and Z component reflection in-phase axes according to the negative speed features of a seismic wave, and selecting the X and Z component reflection wave groups of a seismic channel with the maximum offset; selecting the maximum amplitude time t1 of a negative phase from the reflection wave groups, and calculating the main polarization direction theta1 of t1; selecting a time window with the (t1+/-1) cycle length from a seismic record; carrying out the shifting at a supposed speed Vi based on a seismic signal of the selected time window; carrying out comparison, and obtaining V1max of the maximum offset energy; calculating L1 (=V1max*t1), sequentially building an i-th speed through the main polarization direction theta1, V1max and L1, and building a final speed model. The method does not need to drill a hole for increasing a lateral offset, and saves manpower and time resources. Through the extraction of the effective reflection wave groups and the limiting of the range of the time window, the method effectively avoids the mutual interference of front and rear abnormal interface energy groups, and guarantees the accuracy of speed modeling.

The invention discloses a machinery wireless well deviation measurement instrument while drilling, which is composed of a tooth type measuring device, a pulse generating device and a cylinder body. The pulse generating device is located on the upper end of the tooth type measuring device and is connected with the tooth type measuring device by the inner gear of the cylinder body. When well deviation is measured, the slime pump is closed, the tooth type measuring device is rotated along the rotation of the bracket under the gravity action of the weight block until the gravitational potential energy is minimum; the well deviation angle is expanded by the accelerating gear group device and changed into the displacement of the pulse shaft by the gear in the process; then the pump is opened again, the displacement is changed into the pulse number which is corresponding to the well deviation angle one by one by the pulse generating device and is sent to the ground by the drilling fluid medium, thereby finishing the wireless measuring while drilling of the well deviation exactly and stably. The invention has simple structure, small volume, convenient operation, wide application, can be suitable for well deviation measurement and well quality control for the ground layer environment of high temperature and high pressure deep well and super deep well, and can be applied to the well track measurement of the positioning well, the horizontal well, the big displacement well and the branch well and the controlling engineering.

A preparation method of a flame-retardant epoxy foamed material is provided to mainly solve the technical problem of inhibition of the inflammable characteristic of epoxy foam, and has the advantages of low preparation cost, simplicity and reliable product quality. The method is characterized in that brominated bisphenol A type epoxy resin is compounded with antimony trioxide to improve the flame retardation performance of the epoxy foam, and a nanometer filler is added to enhance the strength of the epoxy foam. The flame-retardant epoxy foamed material prepared through the preparation method can be applied in high-tech fields of aerospace, vehicles, ships and electric appliance insulation.

The invention relates to a three dimensional (3D) printed PCL-PDA-AgNPs scaffold for anti-infective bone tissue engineering as well as a preparation method and application of the 3D printed PCL-PDA-AgNPs scaffold, belonging to bioengineered human implants. According to the method, poly(epsilon caprolactone) is used as a base material, polydopamine is used as a surface modification material, and silver nanoparticles with anti-infective biological properties are combined for use, so that the biological functions of anti-infection, bone growth promotion and bone defect repair are realized. The 3Dprinted PCL-PDA-AgNPs scaffold for the anti-infective bone tissue engineering has the advantages of being simple and reliable in structure, controllable in appearance and micro-structure, reliable inmechanical properties, controllable in ion release property, convenient in implantation, less in trauma and low in cost.

The invention relates to a three-layer type PVB (polyvinyl butyral) film with sound insulation performance and a preparation method. The three-layer type PVB film is prepared from resin films on a lower A layer, a middle B layer and an upper C layer through pressing, wherein the middle B layer is prepared from, in percentage by mass, 30%-60% of improved PBV resin powder and 40%-70% of a plasticizer; each of the lower A layer and the upper C layer is prepared from, in percentage by mass, 60%-80% of improved PVB resin powder and 20%-40% of a plasticizer; the improved PVB resin powder is prepared from components in percentage by mass as follows: 7.5wt%-10.0wt% of polyvinyl alcohol, 3.0wt%-10.0wt% of butanal, 1.0wt%-6.0wt% of hydrochloric acid, 0.01wt%-0.10wt% of a surfactant and the balance of pure water. The preparation method comprises steps as follows: preparation of the improved PVB resin powder and preparation of the three-layer type PVB film. The three-layer type PVB film has the function of insulating noise at 1,000-4,000 Hz after being applied to sandwich glass and improves the sound insulation effect by 3-5 dB.

The invention discloses a self-hole-forming and self-tapping shearing force connection piece and a construction method thereof. By means of the self-hole-forming and self-tapping shearing force connection piece, a laminated wood beam and a light-weight aggregate concrete flange are combined together. The self-hole-forming and self-tapping shearing force connection piece comprises a drill bit, a chip storage groove, a thread, a limiting joint, a nail rod and a hexagon head. The nail rod comprises a smooth section and a threaded section. The smooth section is poured in the bottom face of the light-weight aggregate concrete flange, and the threaded section is nailed into the top face of the laminated wood beam. The limiting joint capable of controlling the depth by which the shearing force connection piece is embedded in wood at any embedding angle is arranged between the smooth section and the threaded section. The self-hole-forming and self-tapping shearing force connection piece can be applied to floors and roofs of houses, landscape architecture and bridges of garden scenic regions and other structures.

The invention provides a pump body assembly and a compressor. The pump body assembly comprises a motor, a crankshaft, a first bearing and a second bearing, wherein one end of the crankshaft is used for being connected with the motor, the first bearing is arranged on the other end of the crankshaft in a sleeving mode, and the second bearing is arranged on the crankshaft in a sleeving mode; the second bearing comprises a first bearing section, a clearance bearing section and a second bearing section which are connected in sequence, and the second bearing section is connected to the end, facing the first bearing, of the clearance bearing section; the second bearing further comprises a second bearing annular groove surrounding the crankshaft, and the second bearing annular groove is located inthe end wall, facing the first bearing, of the second bearing section; and a groove is formed in the inner side wall of the clearance bearing section, or a groove is formed in the peripheral wall, corresponding to the clearance bearing section, of the crankshaft. According to the pump body assembly, through the arrangement of the groove, viscous resistance loss can be reduced, and lubrication ofthe upper end of the second bearing can be improved; and through the arrangement of the second bearing annular groove, the root abrasion of the second bearing can be improved.

The invention relates to an assembled four-piece combined circular steel pipe concrete inner support structure and a manufacturing method, and belongs to the technical field of support and support in foundation pits of subway stations. The prefabricated four combined circular steel pipe concrete inner support structure includes different types of circular steel pipe concrete straight supports. Including short straight stay and standard straight stay. The straight supports are connected to each other by high-strength bolts. All components are composed of ultra-high-strength concrete filled round steel pipes, and the cross-sections of four round steel pipes are arranged in a square. The present invention satisfies the splicing needs of supports in foundation pits of different lengths by combining different forms of component lengths, and provides an assembled combined circle with high rigidity, reusability and low cost, which can be used as internal supports in the foundation pit or shaft enclosure structure system The inner support structure of concrete filled steel tube can effectively solve the problems of complex construction and high cost of concrete support. The comprehensive benefit is remarkable, and it has important engineering application value and development prospect.

The invention relates to a preparation method of a sample for measuring the semisolid injection forming mechanical property of a magnesium alloy. The preparation method is characterized by comprising the following steps of: (1) solidifying a mould of a mechanical property sample die cavity with a mould frame of a magnesium alloy semisolid injection forming machine by inlaying and bolting manners to be combined into a mechanical property sample mould; (2) heating magnesium alloy crumbs to ensure that slurry is positioned in a semisolid and semi-molten state; (3) evacuating the solidified combination, then injecting the semisolid and semi-molten magnesium alloy slurry in the step 2 into a mould, controlling the heating temperature of a fixed material tube, the heating temperature of the mould and the injection speed, demoulding the solidified and formed magnesium alloy by selecting a mould release agent and interrupting samples with different thicknesses for measuring. By using the method, the mechanical property fluctuation measured by different samples with different thicknesses is small, so that the mechanical property reached by a magnesium alloy material in the semisolid injection forming can be better reflected and estimated.

The invention relates to an articular cartilage microstructure nanoindentation inlaying and water-retaining sample stage and an experiment method. The sample stage is composed of a stage body, a containing groove, sleeve, an articular cartilage and a resin. The articular cartilage microstructure nanoindentation inlaying and water-retaining sample stage can solve the problems that the surface of a cartilage sample is difficult to treat and the surface of the cartilage is dehydrolyzed when an inlaying method is adopted, so that the whole tested sample does not have any micro disturbance in the surface treatment and test processes. The sample stage treats the surface of the cartilage in a grinding and polishing manner, and can effectively show the microstructure of the surface of the cartilage; and the sample can not cause disturbance in the grinding and polishing process and the test process. All the existing nanoindenters in China basically depend on import, and water-retaining assemblies thereof are high in cost. The experiment method lowers the experiment cost, and the credibility is higher than that of an assembly configured on the nanoindenter.

The invention discloses a titanium microalloying seamless line pipe and a preparation method of the titanium microalloying seamless line pipe. The line pipe comprises the following components of, by weight percentage, 0.13% <= C <= 0.16%, 0.15% <= Si <= 0.35%, 1.25% <= Mn <= 1.40%, S <= 0.002%, P <= 0.01%, 0.02% <= Ti <= 0.04%, Nb <= 0.01%, V <= 0.01%, 0.02% <= Al <= 0.04%, N <= 0.005%, Cr <= 0.1%, Ni <= 0.08%, Cu <= 0.08%, Mo <= 0.01% and the balance Fe and inevitable impurities, wherein 0.008%+3.42 [N]+3 [S] <= Ti <= 0.012%+3.42 [N]+3 [S]. The single titanium alloying line pipe which is excellent in comprehensive performance and low in cost is successfully prepared by strictly controlling the content of each chemical component in the line pipe.

The invention discloses a prefabricated assembled node, which is characterized in that it consists of a prefabricated active powder concrete pipe, connecting steel pipes, internal concrete columns and steel beams; wherein, the upper and lower layers of prefabricated active powder concrete pipes are bonded to the connecting steel pipes with an adhesive Both ends; the longitudinal reinforcement of the internal concrete column is welded to the inner wall of the connecting steel pipe; the steel beam is connected to the connecting steel pipe through the end plate and bolts, or connected to the node by a short leg beam welded on the side of the connecting steel pipe. The invention realizes the assembled structure of prefabricated active powder concrete tube composite column-steel beam. Compared with the existing steel pipe concrete-steel beam assembled joint, this new assembled joint not only has good constructability and mechanical properties, but also It has outstanding fire resistance, durability and economy, and at the same time saves resources and energy more, and meets the requirements of sustainable development.

The invention provides a clamping device for high-speed stretching of automotive plastics. The clamping device comprises a first clamping unit, a second clamping unit, and a sleeve bushing. The firstclamping unit and the second clamping unit are symmetrically located at both ends of the sleeve bushing, and the second clamping unit has the same structure as the first clamping unit. The first clamping unit comprises a clamping head, a connecting piece, and two sliding blocks, wherein the clamping head has a U-shaped structure and comprises a connecting end and an open clamping end; and the inner width of the clamping end is smaller than the inner width of the connecting end. The sliding blocks are all located in the clamping head, and cooperate with the clamping head, and a gap is formed between the sliding blocks. According to the clamping device for high-speed stretching of the automotive plastics, the gap between the two sliding blocks can be adjusted, thereby effectively clamping asmaller sample, which expands the size range of a test sample of a testing machine, and increases the test capability.

The invention provides a Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy with excellent thermal modification and a preparation method of the Co-Cr-Fe-Ni-V-B eutectic high-entropy alloy. A general formula of the eutectic high-entropy alloy is CoaCrbFecNidVeBf, 0.8 < = a < = 1.2, 0.8 < = b < = 1.2, 0.8 < = c < = 1.2, 1.6 < = d < = 2.4, 0.8 < = e < = 1.2, 0.3 < = f < = 0.6, and a, b, c, d, e and f are molar ratios of corresponding elements respectively. According to the eutectic high-entropy alloy, through simple high-temperature annealing heat treatment, a long-strip-shaped M3B2 phase is effectively fused and spheroidized and is in a spherical shape, stress concentration is reduced, the fracture toughness of the alloy is greatly improved, and meanwhile the tensile strength is still kept at a high level. The eutectic high-entropy alloy shows a remarkable thermal modification characteristic and has a wide application prospect in the field of engineering structures.