9results about How to "Reduce shear deformation" patented technology

The invention discloses a strong friction bionic surface suitable for smooth and rough surfaces and a preparation method, the strong friction bionic surface comprises a rigidity-variable epoxy shape memory polymer, the rigidity-variable epoxy shape memory polymer is structurally divided into three layers, namely a backing layer, an inclined micro-cylinder array and a smaller-size secondary micro-cylinder array from bottom to top, the backing layer is conveniently fixed on a heating substrate and transfers heat, and the inclined micro-cylinder array is low in rubber-state cylinder modulus in a normal contact stage, so that the inclined micro-cylinder array can be in conformal contact with a dual surface better; before sliding friction, the cylinder is switched to be in a glassy state, the modulus is high, deformation is small, the anti-shearing effect can be effectively improved, and damage caused by large deformation is not likely to happen; the second-stage micro-column array has low contact rigidity when being in contact with a smooth surface or a rough surface, can be well adapted to planes with different sizes of roughness, and is embedded with rough peaks to increase the contact area.

The invention relates to the technical field of high-performance protective composite materials, in particular to a novel hybrid fiber composite material and a preparation method and application thereof.The novel hybrid fiber composite material comprises an energy buffer layer, a shear protective layer, a tensile reinforcing layer and a deformation energy absorption layer which are sequentially stacked, the energy buffer layer is made of a tough aramid fiber-ultra-high molecular weight polyethylene fiber / TPU composite material, the shear protection layer is made of a high-performance carbon fiber / TPU composite material, the tensile enhancement layer is made of a tough aramid fiber / TPU composite material, and the deformation energy absorption layer is made of a tough ultra-high molecular weight polyethylene fiber / TPU composite material. The novel hybrid fiber composite material has the advantages of light weight, high strength, good wear resistance and good protection performance, and has wide application prospects and market values in the fields of aerospace structural members, high-end equipment, protection devices and the like needing to bear high stress, high impact and complex loads.

The invention relates to the technical field of electric power calandria construction, and discloses a soft soil foundation electric power calandria connecting and fixing structure and a construction method.The soft soil foundation electric power calandria connecting and fixing structure comprises a bottom plate, supporting mechanisms are arranged on the two sides of the upper portion of the bottom plate correspondingly, mounting plates are fixedly connected to the two sides of the exterior of the bottom plate correspondingly, and reinforcing mechanisms are arranged on the two sides of the interiors of the two mounting plates correspondingly; the supporting mechanism comprises first arc-shaped blocks, the first arc-shaped blocks are arranged on the two sides of the upper portion of the bottom plate, and the rear sides of the exteriors of the first arc-shaped blocks are rotationally connected with connecting plates. The bottom plate is placed on a soft soil foundation, supporting is provided, foundation pressure is dispersed, the first arc-shaped block is adjusted according to the length of the electric power calandria, the H-shaped insertion block is inserted into the H-shaped insertion groove of the bottom plate, stable connection is formed, shearing stress of reinforcing steel bars is reduced, then the second arc-shaped block is opened, the electric power calandria is clamped by the second arc-shaped block and the first arc-shaped block, and gravity and shearing force are evenly dispersed. Shear force concentration is avoided, steel bar deformation is reduced, and the service life is prolonged.

The utility model relates to the technical field of building construction, especially a multi-beam frame structure, the multi-beam frame structure includes at least one first connecting beam and at least one second connecting beam, one of the first connecting beam and the second connecting beam is the prefabricated connecting piece, and the prefabricated connecting piece is configured to connect the first connecting beam and the second connecting beam. The main purpose of the utility model is to provide a multi-beam frame structure, which aims to reduce the assembly difficulty between the main beam and the secondary beam.

The present application relates to a kind of for measuring carbon fiber composite material big curvature test bending test fixture, belong to composite material mechanical property testing technical field.It includes the upper and lower clamps of independent each other, test piece clamping component, testing machine connecting piece, connecting rod;Clamp arm and test piece clamping component are connected by four screws, and then test piece is fixed, ensure that test piece realizes firm clamping when bending load starts;Clamp center of gravity and pivot coincide, ensure that the torque caused by gravity in bending test does not affect test result.The advantage is that the structure is simple, clamping is convenient, can be adapted to a variety of testing machines, and has good application prospect in carbon fiber composite material bending test.

The invention discloses metal part shearing equipment and a machining method thereof. The shearing equipment comprises a shearing unit, a first roller conveying belt and a second roller conveying belt. The shearing unit comprises a shearing table, a portal frame fixedly connected with the top of the shearing table, a shearing mechanism fixedly connected with the top of the portal frame, a pair of pressing mechanisms fixedly connected with the shearing mechanism, a notch preheating mechanism connected with the pair of pressing mechanisms correspondingly, and a pair of stabilizing mechanisms connected with the pair of pressing mechanisms correspondingly. The pair of stabilizing mechanisms are further connected with the pair of notch preheating mechanisms correspondingly, the first roller conveying belt is located on the left side of the shearing table and used for conveying a to-be-sheared metal plate to the shearing table, and the second roller conveying belt is located on the right side of the shearing table and used for moving the sheared metal plate away from the shearing table. By directly heating the notch of the metal plate and effectively pressing and fixing the metal plate, the shearing deformation can be effectively reduced, and the shearing precision is improved.

The present invention discloses a composite foundation of controllable rigid piles and compacted gravel piles and a construction method thereof, the foundation comprising a soft soil foundation, a sand cushion layer laid on the soft soil foundation and a drainage ditch arranged outside the sand cushion layer; a plurality of rigid piles are arranged in the soft soil foundation; a sleeve is arranged on the rigid pile, the top of the sleeve extends upward to the top surface of the sand cushion layer, and the bottom end of the sleeve is contracted to tightly sleeve the rigid pile; the sleeve is respectively connected to a grouting pipeline and a grouting pipeline; cement slurry is injected into the sleeve, and a cover plate is arranged on the sleeve; a plurality of gravel piles are evenly arranged in the sand cushion layer around the cover plate, the top of the gravel pile is flush with the top surface of the sand cushion layer, and the bottom end of the gravel pile penetrates the sand cushion layer and extends into the soft soil layer. The composite foundation of controllable rigid piles and compacted gravel piles of the present invention can reduce the maximum-minimum principal stress difference and shear stress of the foundation soil, thereby improving the foundation stability.

This invention discloses a high-strength precast cement power pole and its manufacturing method, relating to the fields of power engineering and communication infrastructure technology. The high-strength precast cement power pole and its manufacturing method include a pole body, a base plate fixedly connected to the bottom end of the pole body, reinforcing ribs uniformly fixedly connected to the base plate, the other end of each reinforcing rib fixedly connected to the pole body, and a pre-embedded pier with a frustum-shaped structure at the bottom end of the base plate. A connecting mechanism is provided between the base plate and the pre-embedded pier, and steel reinforcement is embedded inside the pole body. In this high-strength precast cement power pole and its manufacturing method, the pole body is the core load-bearing component, and the internal steel reinforcement enhances its flexural and tensile strength. The base plate at the bottom end of the pole body increases the contact area with the pre-embedded pier, dispersing pressure and preventing the pre-embedded pier from sinking into the soil. The reinforcing ribs strengthen the connection between the pole body and the base plate, reducing stress concentration and preventing loosening. The frustum-shaped pre-embedded pier conforms to the soil stress, and together with the connecting mechanism, ensures the stability of the power pole, meeting the long-term power transmission requirements.

The application discloses a steel pipe concrete shearing connecting piece with a constraint structure, which comprises a steel pipe concrete component for connecting a steel structure and a reinforced concrete structure and a tensile constraint structure thereof, the steel pipe concrete component comprises a steel pipe welded at one end with the steel structure, a high-strength and high-performance concrete filling layer poured in the steel pipe, and a steel cap embedded in the reinforced concrete structure and fixedly connected with the other end of the steel pipe, the constraint structure comprises a high-strength and high-performance concrete ring arranged on the outer periphery of the steel pipe, a tensile unit arranged on the outer periphery of the high-strength and high-performance concrete ring, and spiral reinforcement arranged around the tensile unit and the outer side of the steel pipe. The application can greatly improve the shearing strength and rigidity of the shearing connecting piece, ensure that the welding position is not a shearing weak position of the steel-concrete composite structure, effectively inhibit the splitting of the reinforced concrete and development thereof, and make the bearing capacity of each structure fully play; the shearing connecting piece has excellent structural toughness and can coordinate the deformation difference between the steel-concrete composite structures.