155 results about "Internal friction" patented technology

The self-adaptive staged energy consumption friction-shear yield composite damper comprises a friction energy consumption unit, an inner friction plate, an outer friction plate, at least two shear energy consumption units and an H-shaped steel plate, wherein the inner friction plate and the outer friction plate are located on the friction energy consumption unit, and the H-shaped steel plate is located at the tail end of the friction energy consumption unit and used for fixing the friction energy consumption unit. The prestressed bolt sequentially penetrates through the inner friction plate and the outer friction plate on the friction energy dissipation unit and the shear energy dissipation unit and is connected with the inner friction plate and the outer friction plate on the friction energy dissipation unit and the shear energy dissipation unit through at least one pair of linkage rods, and the two ends of the friction energy dissipation unit are connected to beam-column joints respectively. The linkage rod does not make contact with a linkage rod penetrating hole of the shearing energy dissipation unit during displacement, and only the friction energy dissipation unit works; and the linkage rods make contact with the linkage rod penetrating holes in a displacement mode, the shear energy dissipation devices are fixed, the shear plates are subjected to shear deformation, and the earthquake displacement response of the structure is effectively reduced through staged energy dissipation and the displacement amplification effect.

The invention discloses a strong-combination wide-temperature-range wear-resistant composite coating, and relates to the technical field of solid lubricating materials, the composite coating comprises a transition layer, a functional inner layer, a diffusion barrier layer and a functional outer layer which are sequentially formed on the surface of a matrix, the transition layer is a Mo layer and a Mo2N layer, the functional inner layer is a MoAgN layer, the diffusion barrier layer is a Mo2N layer, the functional outer layer is a MoAgN layer, and the functional inner layer is a MoAgN layer. The functional outer layer is a MoAgN layer, and the MoAgN layer comprises a Mo2N phase and an Ag phase. The invention further discloses a preparation method of the composite coating and application of the composite coating in the field of solid lubrication protection. The composite coating is good in film-substrate binding force and low in friction coefficient and wear rate in a wide temperature range, damage to key mechanical parts in the air foil bearing caused by high-temperature lubrication failure can be avoided, and the tribological performance of the bearing parts under the working condition of the wide temperature range is improved.

The invention belongs to the technical field of metal ropes, and provides a high-oil-content coated metal rope and a preparation method and application thereof.The coated metal rope comprises a metal rope body and a plastic outer layer coated on the outer surface of the metal rope body, and the metal rope body comprises a core wire containing first lubricating oil and a side wire containing second lubricating oil; the side wire is wound on the outer surface of the core wire, and the flash point of the first lubricating oil is 20-30 DEG C higher than the melting temperature of the plastic outer layer; the flash point of the second lubricating oil is 50 DEG C higher than the melting temperature of the plastic outer layer. According to the method, in the plastic outer layer coating process, the oil volatilization amount can be greatly reduced, plastic outer layer swelling, bubble existence and coating failure are avoided, the prepared high-oil-content coated metal rope is good in self-lubricating performance, internal friction and breakage of the metal rope can be greatly reduced, and the high-oil-content coated metal rope can be applied to a driving mechanism of a vehicle side sliding door.

The utility model discloses a damping bearing seat assembly, including bearing body, bearing sleeve frame and bearing seat, bearing body is fixed in bearing sleeve frame, the bottom end of bearing sleeve frame is fixed connection with mounting plate, threaded rod passes through the through-hole on mounting plate and then is threaded connection with threaded groove, the bottom end of mounting plate is fixed connection with the flashboard, and the flashboard is fixed on the bearing sleeve frame. The two sides of the insertion plate are fixedly connected with external damping layers, and the insertion plate is inserted into an insertion groove in the bearing seat. According to the vibration reduction bearing seat assembly, when the bearing body operates and vibrates, the mounting plate is fixedly mounted in the butt joint groove to achieve the primary rigid vibration reduction effect, meanwhile, the bearing body and the bearing sleeve frame transmit vibration to the inserting plate, internal friction is generated between the external damping layer on the outer side of the inserting plate and the internal damping layer on the partition plate, and the vibration reduction effect is achieved. Vibration energy is converted into heat energy through internal friction between the external damping layer and the internal damping layer, and the vibration reduction effect is achieved.

The utility model relates to a composite cover plate used for an automobile inverter, the composite cover plate comprises a lower layer aluminum cover plate, a viscoelastic fiber high polymer layer and an upper layer aluminum cover plate, the composite cover plate comprises the lower layer aluminum cover plate, the viscoelastic fiber high polymer layer and the upper layer aluminum cover plate from bottom to top in sequence, and the lower layer aluminum cover plate is provided with reinforcing ribs. Compared with the prior art, by designing the reinforcing ribs and using the viscoelastic fiber high polymer layer, the damping effect is adjustable, and the impedance performance can be adjusted to reach the maximum at the resonance frequency according to the resonance characteristic of an electric drive system so as to restrain the resonance peak value; the composite cover plate is integrally punched and formed, and compared with a traditional sound insulation foam pasting mode, the composite cover plate is more reliable in structure; the viscoelastic fiber high polymer layer has a high internal friction angle, vibration energy is converted into internal energy of the viscoelastic fiber high polymer layer and dissipated, and the effects of reducing mechanical vibration and lowering noise are achieved; mounting holes are uniformly formed, so that the fixing effect is better, and the stress is more uniform.

The invention discloses a dynamic real-time measurement method and device for the friction coefficient in a rotary shear type granular material, and belongs to the technical field of granular material measurement. The dynamic real-time measurement device for the friction coefficient in the rotary shear type granular material comprises a rotary shear rheological experiment cavity which is connected to a bottom plate through a mounting bracket; the filler is filled with a to-be-detected granular material; the normal load monitoring unit comprises an upper pressure sensor and a lower pressure sensor which are located on the upper portion and the lower portion of the rotary shear rheological experiment cavity, in-situ real-time measurement of the internal friction coefficient of the granular material in the shear flowing process is achieved, and the technical problem that the internal friction characteristic of the granular material is difficult to measure through a traditional method is solved. A cooperative working mechanism of an axial constraint type dynamic loading platform, an annular medium distribution structure and a rotary shear rheological experiment cavity is innovatively designed, shear flow in the granular material is achieved, and the internal friction coefficient of the granular material is measured.

The present application belongs to the technical field of metal materials, and particularly relates to a method for in-situ measuring MC carbide solid solution and precipitation temperature by internal friction. The present application uses pure iron and pure chromium to prepare Fe-Cr based alloy samples, processes the samples into internal friction samples after solid solution and rolling; in a vacuum environment, the samples are heated to a preset target temperature covering the expected solid solution characteristic temperature range of MC carbide at a constant rate and are kept at the temperature, then are cooled at the same rate, the internal friction value and modulus are continuously measured, and a first and second in-situ internal friction temperature spectrum is drawn; the frequency dispersion characteristics of grain boundary relaxation peak, the internal friction value mutation and the modulus change in the two temperature spectra are compared to determine the solid solution temperature and precipitation temperature of MC carbide. The method has high sensitivity and simple operation, and is suitable for in-situ characterization of grain boundary precipitates in low carbon content Fe-Cr based alloys.

The invention belongs to the technical field of heat conduction materials, and discloses a high-heat-conductivity liquid metal thermal interface composite material and a preparation method thereof.The composite material comprises, by weight, 60-90 parts of gallium, 10-25 parts of indium, 0-20 parts of tin, 1-3 parts of nickel-coated carbon and 0.01-1 part of silicon carbide; the nickel-coated carbon and the silicon carbide are compounded into the liquid metal gallium indium tin, so that the high-thermal-conductivity liquid metal thermal interface composite material can be obtained; wherein the nickel-coated carbon is added, so that the heat-conducting property of the gallium-indium-tin liquid metal can be remarkably improved, because on one hand, a nickel layer is used as a thermal bridge for connecting a carbon material and the liquid metal, the interface thermal resistance can be reduced, the wettability of nickel and gallium-indium-tin is good, and on the other hand, the viscosity of gallium-indium-tin can be improved to a certain extent; therefore, random flowing of the liquid metal is inhibited; and silicon carbide does not react with gallium indium tin at normal temperature, so that the internal friction resistance of the liquid metal can be increased, and the silicon carbide can be embedded into the interface of the liquid metal and the substrate, thereby improving the affinity of the material.

The application relates to a drainage asphalt mixture grading design method based on a single particle size main skeleton concept, which comprises the following steps: selecting raw materials; adding 6mm, 8mm and 11mm screen meshes to finely divide coarse aggregate particle size subintervals; designing coarse aggregate grading, selecting single particle size coarse aggregates with different particle size subinterval proportions to construct a coarse aggregate main skeleton structure; proposing a particle size distribution index, calculating the particle size distribution index corresponding to the single particle size coarse aggregates with different particle size subinterval proportions; designing fine aggregate grading; adopting a coarse aggregate void filling method to determine asphalt content and coarse and fine aggregate ratios; forming test pieces to conduct mechanical property verification tests and drainage performance evaluation tests; and taking the particle size distribution index value to guide coarse aggregate grading design. The coarse aggregate main skeleton structure has good embedding and extruding capacity and internal friction resistance, the mixture prepared by optimizing grading has the characteristics of good skid resistance and strong drainage performance, and the rain environment high-speed driving safety can be significantly improved.

The utility model relates to the technical field of embedded scraper conveyors, in particular to a vertical embedded scraper conveyor, which is characterized in that the other end of a middle section of an inclined section is fixedly connected with a bent section, one end of the bent section is fixedly connected with a horizontal feeding section, and a plurality of partition plates are arranged among the middle section of the inclined section, the bent section and the horizontal feeding section; a scraper chain is connected between the head part and the tail part; the scraper chain comprises a plurality of chain rods, the chain rods are connected through pin shafts, the bottom end of each pin shaft is connected with a check ring, the two sides of each chain rod are fixedly connected with scrapers, and each scraper is fixedly connected with a side baffle. The two side baffles are symmetrically arranged on the scrapers of the scraper chain, so that materials can be effectively prevented from sliding downwards from the gaps between the scrapers and the shell, transverse side pressure and internal friction force between the materials are guaranteed, the materials form stable material flow in the shell of the inclined section, and the material conveying capacity is guaranteed.

The utility model discloses a kind of viscous damping wall devices for bridge, belong to damping equipment technical field, comprising: movable member is movably inserted in damping wall, damping cavity is provided in the damping wall, damping liquid is provided in the damping cavity, the movable member sliding connection with damping cavity can be with damping liquid and shear motion occurs, the movable member includes the fixed connection of fixed part with bridge superstructure, the fixed part bottom end sliding connection has the plugboard connecting piece that can be along bridge transverse sliding, plugboard connecting piece is fixedly connected with plugboard, the plugboard sliding connection is in damping cavity.The utility model is converted into heat energy dissipation by the internal friction effect between fluid molecules, and the mechanical vibration energy of structure is continuously converted into heat energy dissipation, to effectively reduce the dynamic response of structure.

The present invention relates to a method for calculating the anti-uplift stability coefficient taking into account the shear strength of the soil above the caisson blade foot, and the method comprises the following steps: (1) determining calculation parameters, which mainly include the thickness, density, internal friction angle, cohesion, ground overload, soil plug height in the well, and geometric dimensions of the caisson; (2) determining the type of the caisson according to the width and sinking depth of the caisson; (3) according to the determined different caisson types, substituting the calculation parameters into a calculation expression to calculate the anti-uplift stability coefficient of the caisson structure; the method for calculating the anti-uplift stability coefficient taking into account the shear strength of the soil above the caisson blade foot proposed by the present invention can quickly and accurately analyze the anti-uplift stability of the caisson in actual engineering, and provide theoretical support for design and construction.

This invention relates to a design method for reinforcing rock mass structures with small-diameter piles under post-load conditions in the field of slope protection. The method first obtains the inclination angle θ of the outward-dipping structural surface, the internal friction angle and cohesion c, the sliding mass weight γ, the sliding mass height H, the stress ratio n between the pile and the rock mass at the structural surface, the vertical load q applied to the upper part of the sliding mass after the construction of a single deeply embedded small-diameter anti-slide pile, the sliding mass width b, and the horizontal extension length l. Then, using these parameters, it calculates the initial axial force of the deeply embedded small-diameter anti-slide pile before sliding, the deflection angle of the deeply embedded small-diameter anti-slide pile when the anti-slide force is at its maximum, the minimum compressive stiffness of the small-diameter anti-slide pile, and the axial force and anchorage length of the deeply embedded small-diameter anti-slide pile caused by compression after minor deflection deformation at the structural surface. This invention saves resources compared to empirical design methods.

The present application belongs to the technical field of highland tunnel construction, in particular to a tunnel side and upward slope collapse treatment method, the treatment method comprises S5, parameter inversion and model calibration: comparing the displacement data monitored in step S2 with the predicted value of the model in step S1, when the deviation exceeds the preset threshold, the slope geometric model is kept unchanged, the geomechanical parameters in the model are systematically inverted and adjusted by using the iterative algorithm, the stability state calculated by the three-dimensional wedge method is matched with the actual state of the slope reflected by the monitoring data, so as to calibrate the model, and the geomechanical parameters at least include the effective cohesion and effective internal friction angle of the sliding surface. The tunnel side and upward slope collapse treatment method accurately identifies the geometric shape and size of the potential unstable wedge body from the beginning through three-dimensional geological modeling and stereographic projection analysis, so that the treatment measures are more targeted, and blindness is avoided.

The invention relates to the technical field of precision manufacturing of automobile parts, and discloses a flexible machining process for a shaft head of an automobile driving system, which comprises the following steps: firstly, immersing the shaft head to be machined into a liquid low-melting-point alloy, and forming full-surface profiling coating and holding after cooling and phase change; then, in the rough machining stage, the medium temperature is reduced and maintained in a low-temperature high-rigidity interval, and a high-rigidity support obtained after medium hardening is used for resisting large cutting force; in the finish machining stage, the medium temperature is actively increased to a near-melting-point high-damping interval, and high-frequency flutter energy is effectively dissipated by utilizing the friction characteristic in crystal boundaries in cooperation with ultrasonic vibration cutting; and finally, melting an interface layer by utilizing a high-frequency induction skin effect to realize rapid lossless unloading. The rigidity and damping characteristics of a medium are dynamically regulated and controlled through a thermal-force coupling feedback mechanism, the problems of clamping deformation and machining chatter of a thin-wall hard workpiece are effectively solved, and the geometric dimension precision and the surface quality of a shaft head are improved.

The invention relates to a high-strength and high-damping ZA22 / 6061 layered composite material and a preparation method thereof. The composite material is of a five-layer sandwich structure formed by sequentially and symmetrically overlapping an outer layer, a middle layer, a central layer, a middle layer and an outer layer, in the preparation method, through the solid solution and aging heat treatment process, the optimization requirements of the microstructures of the two alloys can be met at the same time; and meanwhile, an interface layer which consists of fine grains and is proper in thickness is formed in situ at the interlayer interface. The inherent problem that two alloy heat treatment systems are incompatible is successfully solved, the yield strength of the obtained material is larger than or equal to 180 MPa, the tensile strength is larger than or equal to 190 MPa, the ductility is larger than or equal to 20%, and meanwhile the room-temperature internal friction value of the material at the testing frequency of 0.5 Hz is not lower than 0.028.

The present invention discloses a method for determining the constant m in the Hoek-Brown criterion based on digital drill parameters. i The cutting force F is obtained by using the Hoek-Brown criterion and the relationship between the digital drill parameters. t With thrust F n The relationship curve of the drill bit rake angle α and the rock contact friction angle θ between the drill bit cutting surface and the end face are calculated; the friction angle between the compression zone and the intact rock #imgabs0# and the internal friction angle of the rock #imgabs1# are calculated to draw the cutting force F t About Thrust F n The relationship curve is obtained, the curve intercept b is obtained, and the constant m in the Hoek-Brown criterion is calculated. i ; Substitute θ and #imgabs2# intercept b into the equation of rock cohesion c to calculate cohesion c, and then calculate the rock uniaxial compressive strength UCS; Substitute the calculated constant m i The uniaxial compressive strength UCS is substituted into the H-B criterion to calculate the triaxial compressive strength TCS of the rock. i The accuracy, scientificity and simplicity of the method cannot be guaranteed.

The application discloses a rock stratum horizontal stress measuring method based on a digital drilling technology, and steps of the method comprise the following steps: step 1, a rock digital drilling test is carried out by using a digital drilling device, a relationship between a cutting stress and a feed force is obtained, and then a contact friction angle θ between a cutting surface of a diamond blade and a compression crushing zone is calculated; step 2, the contact friction angle θ obtained in step 1 is used to solve an internal friction angle φ of the rock; and step 3, α, θ, φ', φ obtained in steps 1 and 2 and a rock cohesion c measured are used to solve a confining pressure P of surrounding rock f The method has the advantages of low cost, simple calculation and high precision.

The present invention discloses a damping rubber composition for rail fasteners and its preparation method. The damping rubber composition is characterized by comprising the following raw materials, measured by weight: 100 parts of composite rubber, 25-35 parts of damping particles, 15-20 parts of sheet structure filler, 5-10 parts of plasticizer, 5-10 parts of tackifier, 3-5 parts of high-temperature resistant fiber, 2-4 parts of vulcanizer, 3-5 parts of activator, 2-2.5 parts of accelerator, and 1-3 parts of antioxidant. The composite rubber is a composite of EPDM rubber, natural rubber, and nitrile rubber. The damping particles are elastic particles obtained by filling aerogel nanopores with asphalt and a glycidyl methacrylate-modified elastomer. The damping particles are dispersed in the rubber system, enhancing the mobility of the rubber molecular chains, generating significant internal friction to dissipate energy and induce hysteretic deformation. The elastic pad used in rail fasteners exhibits excellent damping performance, aging resistance, and load impact fatigue resistance.

The present invention provides a shield tunnel segment structure deformation adjustment support device and method, which belongs to the field of tunnel maintenance technology and is used for shield tunnel segment deformation adjustment and repair. The device includes a mobile carrier and a support ring. The mobile carrier carries the support ring to move in the tunnel. The support ring includes at least one group. The axial direction of the support ring is consistent with the axial direction of the tunnel. The outer ring direction of the support ring faces the inner ring surface of the tunnel. The inner ring side of the support ring is connected to the mobile carrier. The outer ring side of the support ring is provided with a support structure. The support structure includes a support plate and an expansion structure provided between the support plate and the support ring. When the expansion structure expands, the support plate moves away from the support ring and approaches the inner ring surface of the tunnel. This method is combined with the device to first inject bentonite slurry before the formal grouting adjustment to reduce the internal friction angle of the sand behind the segment, improve fluidity, create favorable conditions for subsequent grouting adjustment, improve adjustment efficiency and accuracy, simplify the construction process, and shorten the construction period.

The application discloses a kind of based on deformation monitoring data's slope instability evaluation method, it is related to slope engineering monitoring data analysis field, method is: obtaining the related data such as topography, stratum, foundation monitoring point in the range around slope;According to the distribution of deformation foundation monitoring point and deformation fitting potential sliding surface;Establish three-dimensional finite element model of slope, and determine the cohesion and internal friction angle of potential sliding surface by inversion;The inversion cohesion and internal friction angle of sliding surface are calculated by strength reduction method, and the safety factor of slope is determined;According to the horizontal displacement direction of foundation monitoring point and potential unstable slope body, the sliding direction of slope is determined;Finally, the slope, potential unstable slope body and its sliding direction are displayed through visual platform, and the volume of potential unstable slope body and the safety factor of slope are displayed by text.The application determines the three-dimensional sliding surface of slope by surface fitting, and then calculates the safety factor of slope by parameter inversion and strength reduction method, realizes the early warning description of slope instability form including instability volume, direction and other characteristics.

The application discloses a method and device for determining an anti-overturning coefficient of a pit-in-pit double-row-pile supporting structure, and relates to the technical field of foundation pit engineering. The method comprises the following steps: determining a trapezoidal cross-section earth covering rupture angle and an earth covering rupture surface of a trapezoidal cross-section earth covering between a pit-in-pit structure and a double-row-pile supporting structure according to an internal friction angle of soil; determining an anti-sliding force of soil above the earth covering rupture surface according to the size of the trapezoidal cross-section earth covering between the pit-in-pit structure and the double-row-pile supporting structure, the trapezoidal cross-section earth covering rupture angle and the shear strength of the soil layer; and determining the anti-overturning coefficient according to the anti-sliding force of the soil above the earth covering rupture surface, the earth pressure outside and inside the foundation pit, the distance between the anti-sliding force action point and the bottom of the double-row-pile supporting structure and the self-weight of the double-row-pile and the soil between the piles. The method solves the problem that the embedded depth of the supporting structure is generally designed according to experience and is too conservative in the prior art, and the embedded depth of the supporting structure is too deep, which greatly increases the construction cost.

The invention relates to the field of rubber additives, and provides a lignin-based composite material as well as a preparation method and application thereof. In order to solve the problem that in the prior art, the heat generation temperature of rubber prepared by taking lignin as a reinforcing agent is too high, the lignin-based composite material provided by the invention comprises the following components in parts by weight: 100 parts of lignin, 5-50 parts of a porous material, 1-30 parts of a metal oxide modifier, 1-20 parts of an organic acid modifier and 0.1-5 parts of a methylene donor. The preparation method comprises the following step: mixing lignin, a metal oxide modifier, an organic acid modifier, a methylene donor and a porous material to obtain the lignin-based composite material. According to the invention, organic acid salt generated by reaction of organic acid and a metal oxide modifier is used for in-situ interface modification, so that the interface compatibility of lignin and natural rubber can be effectively improved, the internal friction between rubber molecular chains is reduced, and the heat generation temperature of lignin is further reduced.

The invention belongs to the field of direct shear apparatuses, and relates to a device and a method for testing the anti-shearing characteristic of a large-particle-size rock-soil material, which can adapt to a test of internal friction force of large-particle-size rock-soil and can most approximately simulate the actual condition of actual large-particle-size rock-soil accumulation. According to the technical scheme, the device comprises a support, a vertical pressurizing module, a horizontal pressurizing module and a shear box. The vertical pressurizing module is fixed to the support and provided with a first loading piece in the vertical direction. The horizontal pressurizing module is fixed to the support and provided with a second loading piece in the horizontal direction. The shear box is respectively connected with the first loading piece and the second loading piece.

The present application relates to the technical field of highway construction, and particularly relates to a magnesium-based grouting reinforcement slurry mix proportion design method, wherein three kinds of slurry with different cement mixing ratios are configured in the slurry mix proportion design process, and 2-4% of active magnesium oxide curing agent is added to each of the three kinds of slurry to carry out a comparative test, and the final design quality mix proportion is determined through comparison of the results after 28d standard curing. The present application has the following advantages: the incorporation of active magnesium oxide promotes the hydration reaction of cement, improves the early strength of the composite foundation, and promotes the construction progress; the active magnesium oxide-cement composite slurry can significantly increase the cohesion and internal friction angle mechanical parameters of the composite foundation soil, improve the roadbed bearing capacity, reduce the overall settlement of the roadbed, and ensure the stability of the composite foundation; the magnesium hydroxide crystals generated by the hydration reaction of active magnesium oxide produce expansion to compensate for the shrinkage caused by the hardening of cement.

Brake caliper, comprehensive: a case (110); Pistons (121, 122) are arranged on opposite sides of the housing (110); inner and outer lining plates (123, 124) which are at least partially arranged in the housing (110) and are movably configured by the pistons (121, 122), each of the inner and outer lining plates (123, 124) having projections (123a, 124a) on opposite sides of each of the inner and outer lining plates (123, 124); inner and outer friction linings (125, 126) coupled to the inner and outer lining plates (123, 124) respectively; and a lining spring (200, 300, 400) comprising a plurality of guide supports (220, 250) configured to guide the movement of the inner and outer lining plates (123, 124), each of the guide supports (220, 250) comprising the following: a concave curved section (230, 260, 330, 430, 460) in which one of the projections (123a, 124a) of the inner and outer covering plates (123, 124) is arranged; and a return tab (240, 270, 340, 440) configured to elastically support one of the inner and outer lining plates (123, 124) such that one of the inner and outer lining plates (123, 124) returns to an original position in response to the movement of one of the inner and outer lining plates (123, 124) by the return tab (240, 270, 340, 440), wherein the concave curved section (230, 260, 330, 430, 460) of the lining spring comprises an upper part (230a, 260a), a side part (230b, 260b) which is bent downwards from the upper part (230a, 260a) of the concave curved section (230, 260, 330, 430, 460) of the lining spring (200, 300, 400), and a lower part (230c, 260c) which extends from the side part (230b, 260b) of the concave curved section (230, 260, 330, 430, 460) of the lining spring (200, 300, 400) to one of the inner and outer lining plates (123, 124) is bent, and wherein each of the guide supports (220, 250) further comprises a lateral support projection (246, 281) which is curved and extends from a lower section (245, 280) of one of the guide supports (220, 250) which is located below the concave curved section (230, 260, 330, 430, 460) in a direction away from one of the inner and outer covering plates (123, 124).

The invention discloses a metal mine soft rock roadway mechanical tunneling excavation method which comprises the following steps: step 1, dividing a roadway section into six areas, and designing eight different excavation sequence schemes; 2, lithology, compressive strength, cohesion and internal friction angle parameters of roadway section rock are determined, and a three-dimensional numerical model is established; 3, numerical simulation is conducted on surrounding rock responses under different excavation sequences; 4, calculating the ratio of the plastic zone area to the maximum deformation of each scheme, and preferably selecting four schemes with relatively large stability evaluation coefficients; 5, constructing a reference sequence and a comparison sequence, and calculating a correlation coefficient and a correlation degree; and 6, the excavation scheme with the minimum correlation degree is the optimal excavation sequence scheme. According to the method, a metal mine soft rock roadway mechanical tunneling excavation sequence method based on numerical simulation and grey correlation analysis is optimized, the problems that a traditional method is low in efficiency, poor in forming and large in surrounding rock disturbance are solved, and safe and efficient tunneling of the soft rock stratum is achieved.

Provided is a method for producing an electrode with which it is possible to obtain a composite material sheet having good stretchability. The method for manufacturing an electrode (10) is characterized by comprising: a composite material sheet manufacturing step for manufacturing a composite material sheet (12) by forming a powder (20) of an electrode composite material containing an active material and a fibrous binder and having a solid content concentration of substantially 100% into a sheet; and a bonding step in which the composite material sheet (12) is bonded to the surface of the core material (11), and the binder is mainly composed of polytetrafluoroethylene having an inner friction angle of 45 degrees or more.

The invention relates to the technical field of polymer composite materials, and discloses an environment-friendly low-noise automobile rubber damping part and a manufacturing process thereof.The damping part is made of a rubber composite material, and the rubber composite material comprises a dynamic reversible cross-linked rubber matrix, an anti-aging agent, an anti-aging agent and an anti-aging agent. A nanofiller having a core-shell structure; wherein the dynamic reversible cross-linked rubber matrix comprises the following components in parts by mass: 100 parts of furan functionalized epoxidized natural rubber; 3 to 8 parts by mass of bimaleimide; the content of the nanofiller with the core-shell structure is 5-20 parts by mass. By introducing the specially designed core-shell structure nanofiller, an innovative interface friction energy dissipation mechanism is constructed in the material, and the mechanism and the viscoelastic internal friction of a rubber matrix have a synergistic effect to form a dual energy dissipation way, so that vibration energy can be more efficiently absorbed and converted, and the energy dissipation efficiency is improved. And the excellent damping characteristic is shown under a wide working condition.

The invention belongs to the technical field of strip mining and rock soil solidification, and particularly relates to a composite material for solidifying mud rock in a strip mine and a preparation method of the composite material. The main components of the composite material for solidifying the mudstone in the strip mine comprise mudstone, fly ash, calcium oxide and a bacillus subtilis suspension. The invention also provides a preparation method of the composite material for solidifying the mudstone of the strip mine, which comprises the following steps: pretreating the mudstone and the fly ash, preparing bacillus subtilis suspensions with different concentrations, fully mixing a mudstone sample, the fly ash, calcium oxide and the bacillus subtilis suspensions, carrying out compression molding, and maintaining for 7 days or 28 days to obtain the composite material for solidifying the mudstone of the strip mine. The composite material for solidifying the strip mine mudstone is obtained. According to the method, the compressive strength, cohesive force, internal friction angle and other mechanical properties of the strip mine mudstone are remarkably improved, and the disintegration resistance and the impermeability are greatly improved, so that the slope stability is effectively enhanced.