15results about How to "Avoid brittle failure" patented technology

The invention relates to the technical field of metal materials, in particular to a high-strength steel material for mine roadway support and a preparation method thereof, and the high-strength steel material comprises the following components in percentage by weight: 0.04 to 0.10 percent of C, 0.15 to 0.45 percent of Si, 1.20 to 1.80 percent of Mn, 0.20 to 0.50 percent of Cu, 0.15 to 0.40 percent of Cr, 0.10 to 0.35 percent of Ni, 0.08 to 0.25 percent of Mo, 0.015 to 0.045 percent of Nb, 0.03 to 0.08 percent of V, 0.008 to 0.025 percent of Ti, 0.005 to 0.020 percent of RE and the balance of Fe. The preparation method comprises the steps of smelting and refining, continuous casting, heating, rough rolling, finish rolling, segmented controlled cooling and medium-temperature tempering (450-550 DEG C), R is larger than or equal to 620 MPa, A is larger than or equal to 18%, the yield ratio is smaller than or equal to 0.90, KV at 0 DEG C is larger than or equal to 100 J, and the deep-well high-stress roadway support is suitable for deep-well high-stress roadway support.

The application discloses a kind of mud-rock flow blocking dam composite shock-absorbing energy dissipation structures and design methods of preventing big stone block impact, the structure includes dam body, high damping rubber pad, composite shock absorber and impact-resistant steel plate, high damping rubber pad is fixed on dam body slope, its surface is provided with several composite shock absorbers, and impact-resistant steel plate is laid on the top of composite shock absorber;Composite shock absorber includes composite shock-absorbing unit, top plate and bottom plate, and top plate and bottom plate are fixedly connected with impact-resistant steel plate and high damping rubber pad respectively;Composite shock-absorbing unit includes composite material layer, disc spring layer, partition steel plate and compression spring, and the outside circumference of composite shock-absorbing unit is uniformly provided with several U-shaped dampers.The application cooperates high damping rubber pad, composite shock absorber and U-shaped damper to complete hierarchical energy dissipation and shock-absorbing, effectively absorbs and disperses the impact energy of big stone block in mud-rock flow, reduces dam stress concentration and damage risk, and can significantly improve the safety and service life of mud-rock flow defense system.

The application discloses a surface heat treatment process for improving the strength of a mining metal roof beam and relates to the technical field of surface heat treatment, and comprises the following steps: preparation of a multi-element co-permeation agent; pretreatment of a substrate surface; boxing and sealing; gradient high-temperature chemical co-permeation; integrated cooling and quenching treatment; low-temperature tempering stress relief; post-treatment and detection. The application realizes the balance between high surface hardness and high core toughness by constructing a dense functional layer on the roof beam surface in situ through multi-element co-permeation and gradient heat treatment, and improves the service life of the roof beam under heavy load, wear and acidic corrosion environment in a mine.

The utility model discloses a connecting structure of a glass step and a side glass balustrade, which comprises a first titanium alloy embedded part, a second titanium alloy embedded part, a second stainless steel component, assembling grooves and first locking parts, one end of each first locking part penetrates through the corresponding assembling groove to be connected onto the second titanium alloy embedded part, and the other end of each first locking part penetrates through the corresponding assembling groove to be connected onto the second titanium alloy embedded part. A lap joint part is arranged on the first titanium alloy embedded part, a connecting piece is arranged above the lap joint part, a second locking piece matched with each assembling groove is arranged on the connecting piece, one end of each second locking piece sequentially penetrates through the connecting piece and the lap joint part to be connected into the corresponding assembling groove, and third locking pieces are arranged on the two sides of each second locking piece correspondingly; the third locking piece sequentially penetrates through the connecting piece and the lap joint part to be connected to the second stainless steel component. The first titanium alloy embedded part and the second titanium alloy embedded part which are made of titanium alloy materials and the first stainless steel component and the second stainless steel component which are made of stainless steel materials are adopted, so that the strength of the whole connecting structure is improved, and the aesthetic feeling of the whole connecting structure is improved.

The invention relates to the technical field of furan resin, in particular to high-strength furan resin as well as a preparation method and application thereof. The high-strength furan resin comprises the following components in parts by weight: 35-60 parts of furfuryl alcohol, 15-25 parts of formaldehyde, 5-10 parts of urea, 1-3 parts of a formaldehyde reducing agent and 3-5 parts of a cross-linking agent. The high-strength furan resin provided by the invention is high-performance furan resin with high mechanical strength, excellent moisture resistance and low free formaldehyde release, and has a wide application prospect in the field of casting. The introduced cross-linking agent can improve the cross-linking density, improve the tensile strength and avoid brittle failure. In addition, carboxyl in molecules of the cross-linking agent can adjust polarity and compatibility of the system, phase separation in storage and use processes is inhibited, and the storage stability of the resin is remarkably improved. The formaldehyde reducing agent introduced by the invention can be subjected to nucleophilic addition reaction with free formaldehyde in a system, so that the formaldehyde content can be efficiently and enduringly reduced, and the production and use environment can be improved.

The invention relates to an assembly type light partition wall board and a connecting structure thereof.The connecting structure of the assembly type light partition wall board comprises a connecting frame, a top frame, connecting ribs, connecting blocks and supporting ribs, mounting grooves are formed in the connecting frame, first ribs are arranged on the connecting frame, the first ribs and the connecting frame are spliced to form first penetrating holes, and the first penetrating holes are formed in the top frame; a second through hole, a first through hole and a third through hole are formed in the top frame, a clamping groove is formed in the connecting frame, a fourth through hole is formed in the connecting block, a fixing plate is arranged on the top frame, an elastic plate is arranged on the fixing plate, a fifth through hole is formed in the fixing plate, a sixth through hole is formed in the elastic plate, and a first annular groove is formed in the supporting rib. The wet operation mode that tenons of a traditional male and female tenon structure must be filled with mortar and glue is replaced, the construction procedure is simplified, dependence on skills of workers is reduced, the construction period is shortened, full-dry-method fast installation is achieved, and the installation progress of the light partition board is accelerated.

The application provides a FRP reinforcing device and method for inhibiting brittle failure, relates to the field of beam reinforcing and repairing, and aims at the problem that the FRP plate is easy to peel off from the concrete, leading to reinforcing failure. The buckle is used to apply active pressure to the FRP plate to increase the friction between the FRP plate and the concrete, and improve the utilization rate of the FRP. A release mechanism is installed at the end of the FRP plate. The clamp and the elastic piece of the release mechanism are used to elastically constrain the end of the FRP plate, release the displacement of the end of the FRP plate, slow down the brittle peeling failure of the FRP plate, and effectively improve the ductility of the FRP plate and the concrete beam.

The present invention provides a columnar specimen fatigue test loading device, which belongs to the field of material testing devices, and includes: a load transfer member, a first limit end is arranged in the middle of its inner wall; a force member, the outer diameter of which matches the inner diameter of the load transfer member, and a second limit end is arranged on its inner wall; one end of the force member is detachably connected to the load transfer member, and the other end is provided with a through hole; the first limit end and the second limit end are both truncated cone structures with cavities; a clamping assembly, which includes two symmetrically arranged clamping blocks; when the clamping assembly is used, it is located between the load transfer member and the force member, and when a columnar specimen is clamped between the two clamping blocks, the two clamping blocks form a spindle-shaped structure, and at this time, the two side conical surfaces of the spindle-shaped structure formed by the two clamping blocks are respectively abutted against the inner walls of the first limit end and the second limit end. The device can ensure uniform stress distribution at the ends of the columnar specimens in fatigue tests, and avoid brittle failure caused by concentrated force at the ends of the columnar specimens.

The invention discloses self-repairing abrasion-resistant concrete based on a heat-shrinkable fiber net and electromagnetic induction self-repairing fibers. The self-repairing abrasion-resistant concrete comprises an abrasion-resistant concrete base body, a cross-linked modified heat-shrinkable fiber net and the electromagnetic induction self-repairing fibers, wherein the cross-linked modified heat-shrinkable fiber net and the electromagnetic induction self-repairing fibers are distributed in the abrasion-resistant concrete base body; wherein the cross-linking modified thermal shrinkage fiber net is a fiber net which is formed by weaving polyester fibers and aramid fibers in sequence and is subjected to cross-linking modification; the electromagnetic induction self-repairing fiber comprises a core material and a wall material, the core material comprises methyl methacrylate and butyl acrylate, and the wall material comprises polylactic acid and nano Fe3O4. According to the invention, the cross-linked and modified heat-shrinkable fiber net is combined with an electromagnetic induction self-repairing fiber technology, so that the stability, the bearing capacity and the abrasion resistance of the concrete can be effectively improved, the controllable self-repairing of concrete cracks is realized, the durability of the concrete is remarkably improved, the service life of the concrete is remarkably prolonged, and the like. A new thought can be provided for preparation of the high-performance abrasion-resistant concrete.

The utility model relates to the technical field of building accessories, in particular to a high-strength concrete block which comprises a concrete block body, a plurality of longitudinal steel bars are fixedly mounted in the concrete block body, a plurality of steel fibers are fixedly mounted in the concrete block body, and three stirrups are fixedly mounted on the outer surfaces of the longitudinal steel bars. According to the improved concrete building block, a plurality of longitudinal steel bars are added, the tensile capacity of the building block is enhanced, then the longitudinal steel bars are hooped through stirrups, a regular steel bar grid framework is formed, it is guaranteed that the positions of the longitudinal steel bars are accurate when concrete is poured, displacement is avoided, formation and expansion of oblique cracks are prevented, and sudden brittle failure of components caused by shearing force is avoided; the surfaces of all the steel bars are provided with threads, and steel fibers are added into the concrete, so that the contact area of the steel bars and the concrete can be increased, stress distribution is more uniform, and generation and expansion of concrete cracks are delayed.

The present application relates to the technical field of seawater desalination material preparation, and particularly relates to a double-network hydrogel evaporator for interfacial water evaporation, a preparation method and application, comprising a polyvinyl alcohol first network and a 2-acrylamide-2-methylpropanesulfonic acid second network which penetrate each other, and Ti4O7 photo-thermal absorption material is dispersed in the first network; the evaporator has a macroporous skeleton formed by the first network and a multistage pore composed of nanoscale fibrous and membranous secondary structures derived from the second network on the macroporous skeleton, the mechanical stability is improved through a double-network synergistic enhancement mechanism, the multistage pore structure is used to accelerate water transmission and increase the evaporation interface, so that the evaporator has a high evaporation rate, excellent salt resistance and long-term operation stability, and is more suitable for solar-driven seawater desalination, and solves the problems of weak mechanical strength, poor structural stability and poor environmental adaptability of the hydrogel-based evaporator in the prior art.

The invention discloses a composite fiber reinforced high-molecular polymer-solid waste-based marine grouting material and a preparation method thereof. Solid wastes such as recycled concrete micro powder are used as main raw materials, high-molecular polymers and composite fibers are compounded, and the total solid waste mixing amount is 51%-75%. The preparation method comprises the steps of raw material pretreatment, dry powder mixing, fiber dispersion, polymer mixing, wet mixing and the like, uniform mixing of all the components can be guaranteed, and the fiber dispersity is excellent. The grouting material has high compression resistance and tensile strength and excellent freezing and thawing resistance and marine medium corrosion resistance, can effectively resist complex load and severe environment corrosion in ocean engineering and prolong the service life of a structure, is simple in preparation process, is suitable for industrial production, and can be widely applied to grouting connection of foundation structures of ocean engineering such as offshore wind power and the like.

This invention provides a crack-resistant prestressed concrete pipe pile, comprising a concrete pile body, a main reinforcing cage and an auxiliary reinforcing cage coaxially arranged within the concrete pile body, and a fiber-reinforced concrete protective layer disposed on the outer wall of the concrete pile body. The main reinforcing cage includes multiple prestressed main bars distributed at equal intervals along the circumference and spiral stirrups wound around the prestressed main bars. The auxiliary reinforcing cage includes multiple non-prestressed reinforcing bars distributed at equal intervals along the circumference outside the main reinforcing cage and multiple annular stirrups fixed at equal intervals along the axial direction to the non-prestressed reinforcing bars. Short steel anchors embedded in the fiber-reinforced concrete protective layer are fixed to the outside of the annular stirrups. The crack-resistant prestressed concrete pipe pile of this invention significantly improves the crack resistance, ductility, and durability of the pipe pile through double reinforcement constraint and mechanical interlocking structure, combined with the fiber-reinforced concrete protective layer.

The invention relates to the field of tunnel quakeproof, in particular to a multi-stage energy dissipation toughness quakeproof structure of a cross-fault tunnel, which comprises a tunnel main body, a metal lining connected to the outer side of the tunnel main body, a concrete lining arranged at the bottom of the metal lining, an alloy frame A arranged on the inner side of the tunnel main body, and an alloy frame B connected to one side of the alloy frame A, a metal guide rail is installed on the outer side of the alloy frame B, a modular friction energy consumption block capable of preventing shock is installed between the alloy frame B and the metal guide rail, a filling layer capable of damping a tunnel is arranged on one side of the modular friction energy consumption block, and a viscoelastic damper is installed among the alloy frame A, the alloy frame B and the metal guide rail in a penetrating mode. The modular friction energy dissipation block and the viscoelastic damper are cooperatively arranged, and the friction energy dissipation block forms stable friction resistance through a pre-tightening structure and is used for absorbing large-displacement energy; the viscoelastic damper continuously consumes energy for small and medium amplitude vibration through material internal friction.

The application discloses an Inconel pipe gradient coating laser remelting micro-peening composite strengthening method and belongs to the technical field of metal material surface treatment. The application sequentially carries out mechanical sand blasting, ultrasonic cleaning and vacuum drying pretreatment on an INCONEL600 substrate. A pure nickel transition layer, a NiCrCoMo intermediate layer and an Al content gradient changing NiCrCoMo-Alx functional layer are deposited layer by layer by using a multi-target magnetron sputtering to form a three-layer composite gradient coating. The coating is subjected to laser remelting or micro-peening post-processing strengthening. The application relieves the thermal mismatch stress between the coating and the substrate, eliminates the internal porosity defects of the coating, introduces residual compressive stress, significantly improves the high-temperature hardness, wear resistance, corrosion resistance and high-temperature oxidation resistance of the coating, solves the problems of easy cracking, peeling and imbalance of strength and toughness of the traditional homogeneous coating, is suitable for long-acting protection of INCONEL600 pipes and containers under high-temperature and high-pressure working conditions in chemical refining, coal chemical industry and the like, prolongs the service life of equipment and improves the operation safety.