122 results about "Compressive load" patented technology

The invention discloses a method and system for analyzing the rolling resistance of a concrete-filled steel tube combined pier column, and the method comprises the steps: applying an axial compression load to the concrete-filled steel tube combined pier column, and dividing the cross section of the concrete-filled steel tube combined pier column into three layers of regions along a radial material change part; according to corresponding total cross-section average axial strain generated by the steel pipe concrete combined pier column when different axial compression loads are applied, equivalent stress corresponding to each layer of area is calculated, total axial force corresponding to each total cross-section average axial strain is calculated, and a total cross-section average axial strain-total axial force curve is formed; searching a first total cross-section average axial strain corresponding to the maximum value of the total axial force in the total cross-section average axial strain-total axial force curve and a second total cross-section average axial strain corresponding to a first obvious inflection point of the total cross-section average axial strain-total axial force curve, and calculating a ductility coefficient, and judging whether the concrete-filled steel tube composite pier column meets the ductility design requirement or not.

The invention discloses a recycled concrete compression plasticity stage discriminating device based on acoustic emission and stress-strain analysis, which comprises the following steps: applying axial pressure load to recycled concrete test pieces under different working conditions, and synchronously measuring acoustic emission signals and material compression stress-strain curves of the recycled concrete test pieces; and outputting a time and accumulated acoustic emission energy value, an acoustic emission b value, stress and strain Excel table. Constructing a GUI interface through MATLAB, and creating an execution button, an input box and a result and graph display area; callback functions for file selection and operation monitoring are respectively defined based on a GUI interface; extracting data of acoustic emission, b value, stress and strain from a specified Excel worksheet, and performing interpolation processing; calling a function to detect the yield strength and the time and strain of complete damage, and outputting a result. According to the method, the plasticity stage of the material can be rapidly detected by processing the acoustic emission data and the stress-strain data, so that data processing and result display are more intuitive.

The invention discloses a composite material connecting rod structure, and relates to the technical field of composite material structure design and manufacturing, in particular to a light high-strength composite material connecting rod which comprises a composite material rod body, a flange connector, a flange clamp, an adjustable clamp and a tensile bolt set. The composite material rod body is made of fiber reinforced resin matrix composites through a winding or laying winding process, and reinforcing areas and transition oblique angles are arranged at the two ends of the composite material rod body. The adjustable clamp and the flange clamp are in interference fit with the end of the rod body through built-in inclination and surface texture, the flange connector is connected with the clamp through the tensile bolt set, and efficient transmission of tension and compression loads is achieved. Through the integrated combined structural design, the problems of stress concentration and interface failure caused by traditional glue joint or screw joint are solved, the bearing capacity, environmental adaptability and reliability of the connecting rod are remarkably improved, and the connecting rod is suitable for the high-load fields such as aerospace, high-speed rails and heavy machinery.

A threaded connection for pipe in which the axial distance between the box intermediate shoulder surface and the box end shoulder surface of the box before make-up, LB, is larger than the axial distance between the pin intermediate shoulder surface and the pin end shoulder surface of the pin before make-up, LP, such that, upon completion of make-up, the pin and box intermediate shoulder surfaces and are in contact and function as torque shoulders, while the pin and box end shoulder surfaces are in light (or no) contact. The difference between the axial distances, (LB−LP), is such that, when the pin and box are made up and upon application of an axial compressive load, the pin and box are slightly axially compressed by the compressive load and the pin end shoulder surface comes into pressure contact with the box end shoulder surface to bear part of the compressive load.

Protection of tubulars from premature wear in the mid-body section due to highly curved wellbores, including bowing from high axial compressive loads, or gravity induced bowing in a horizontal section of the wellbore is disclosed. It includes a method of installing a strong, wear resistant, fully encircling steel band around the midbody region of tubular joints on new and worn tubulars. Further, it does so without degrading the metallurgy or microstructure of the pipe body yet attaches the protective band with such high clamping force that it is unlikely to slip even under the most extreme service conditions. In addition, the circumferential integrity of the pipe band makes it even less likely to ever break off. A protective band includes a wear resistant hard banding weld overlay installed around the circumference of the protective band.

The utility model discloses a slope reinforcing device for engineering treatment, and relates to the technical field of engineering treatment. A splicing assembly arranged on the lower surface of the base plate comprises a base table, the base table is arranged on the lower surface of the base plate, a clamping block is hinged to the outer side of a reverse damping hinge connected to one side of the base table, a positioning hole is formed in the upper surface of the clamping block, and a clamping base is hinged to the outer side of a forward damping hinge connected to the other side of the base table. A convex handle is connected to the upper end surface of a positioning rod penetrating through the upper surface of the clamping seat; the anti-pressing assembly arranged on the upper surface of the base plate comprises a placement frame. According to the side slope reinforcing device, the splicing assemblies are arranged, the orientation of the clamping bases and the clamping blocks can be conveniently adjusted, position limitation caused when adjacent side slope reinforcing devices are spliced is relieved, the anti-pressure assemblies are arranged, the anti-pressure load of the containing frame is effectively improved, the service life of the containing frame and parts below the containing frame is prolonged, and the service life of the side slope reinforcing device is prolonged.

This invention relates to the field of novel materials, specifically a novel metamaterial exhibiting both multi-stable state and negative Poisson's ratio properties. It comprises a concave hexagonal frame, two arc-shaped beams positioned on the upper and lower sides of the frame's inner cavity, and a vertical rod. The two arc-shaped beams are fixedly connected to the upper and lower ends of the vertical rod via their respective central portions. When the structure is subjected to a vertical compressive load, the frame's diagonal bracing rotates inward, contracting and compressing the ends of the arc-shaped beams, generating a significant negative Poisson's ratio effect. This process forces the arc-shaped beams to bend and deform towards the center, accompanied by energy dissipation. When the displacement reaches a critical threshold, the arc-shaped beams buckle and overturn, switching to a steady state. This invention, through specific geometric configurations and differentiated material layouts, achieves morphological self-repair after impact and reuse under low-intensity conditions. This metamaterial can be arranged as a two-dimensional periodic array as a unit cell.

The utility model discloses an anti-collision device based on low-temperature steel cylinder transportation, and relates to the technical field of low-temperature steel cylinder transportation. Comprising a tank body, a protection device is arranged outside the tank body, and an adjusting device is arranged inside the protection device; according to the self-centering closed-loop locking device, the adjusting device is arranged to fix the steel cylinders with different sizes, the inner circular ring is driven to rotate in the circumferential direction to be linked with the top clamping rod set to achieve self-centering closed-loop locking in cooperation with two-way stirring driving of the locking mechanism, the structural integrity of the inner wall is effectively protected, and meanwhile the fixing requirements of the steel cylinders with different specifications can be met; and by arranging a protection device, when the low-temperature steel cylinder is installed and transported, a buffer spring arranged in a protection plate forms a buffer mechanism, and when continuous extrusion loads are coped, the contact pressure can be reduced, the surface of the cylinder body is effectively prevented from generating plastic deformation, and the anti-collision protection effect on the low-temperature steel cylinder in the cylinder body is achieved.

A separator includes: a first layer having a melting point of 950° C. or more and 2715° C. or less; a second layer having a heat conductivity of 0.02 W / m·K or more and 0.15 W / m·K or less under an environment of a temperature of 700° C. and a pressure of 0.2 MPa; and a third layer for which a compressive load acting on a test piece having a rectangular shape and a dimension of 50 mm square when viewed in a first direction is 0.7 kN or more when a thickness of the test piece is 5 mm and is 8 kN or less when the thickness of the test piece is 2.5 mm, and the first layer, the second layer, and the third layer are provided side by side in the first direction.

To provide an insulating sheet that does not experience an excessive decrease in thermal insulation performance even when subjected to a compressive load in the thickness direction. [Solution] The present invention relates to an insulating sheet 10 that can be interposed between heat sources or between a heat source and a non-heat source to reduce the thermal conductivity in the thickness direction of the sheet, and comprising at least a porous sponge sheet 11 and a layer disposed on the surface of the sponge sheet 11, which is a dispersed layer 21 of a plurality of protrusions 20, and a battery equipped therewith.

To provide a cleaning body that prevents dirt from adhering to the surface of the object to be cleaned, and that maintains its ability to adhere to the object to be cleaned for a long period of time. [Solution] The cleaning body 100 has a core body 102, a foamed elastic layer 104, and an adhesive layer 106, wherein the 25% compressive load of the foamed elastic layer 104 in the high-action region is 1 / 2 or less of the 25% compressive load of the foamed elastic layer 104 in the low-action region.

The invention discloses a rock axial tensile strength and transverse shear strength testing device which comprises a rack, a lower end axial clamp and an upper end axial clamp are arranged in the rack, and a rock sample to be tested is fixed between the lower end axial clamp and the upper end axial clamp; the lower-end axial clamp is fixedly arranged in the rack, and the upper-end axial clamp moves in the rack along the axial direction to apply axial tension to a rock sample to be tested; the rack is internally provided with at least one group of transverse pushing and pressing mechanisms, and the transverse pushing and pressing mechanisms are arranged on the side surface of a to-be-tested rock sample and apply transverse pushing force to the to-be-tested rock sample. According to the invention, the axial tensile strength and the transverse shear strength of the rock sample are tested by axially applying the tensile load and transversely applying the linear pressure load; and a research platform is provided for the mechanical strength change rule of the rock in actual engineering application under different stress state conditions.

A process and apparatus of producing a product having a wrought structure. The process comprises the step of: applying heat and a compressive load simultaneously to an application area of a cold spray deposition preform to transform the comprising consolidated particle structure into a wrought structure, the compressive load being applied laterally to the application area. The application of compressive load and heat to the application area raises the temperature of the material of the preform in the application area to between the recrystallisation temperature and the melting point of the material.

Protection of tubulars from premature wear in the mid-body section due to highly curved wellbores, including bowing from high axial compressive loads, or gravity induced bowing in a horizontal section of the wellbore is disclosed. It includes a method of installing a strong, wear resistant, fully encircling steel band around the midbody region of tubular joints on new and worn tubulars. Further, it does so without degrading the metallurgy or microstructure of the pipe body yet attaches the protective band with such high clamping force that it is unlikely to slip even under the most extreme service conditions. In addition, the circumferential integrity of the pipe band makes it even less likely to ever break off. A protective band includes a wear resistant hard banding weld overlay installed around the circumference of the protective band.

Provided is a compact threaded joint which has excellent sealing performance against internal pressure and sealing performance against external pressure, has excellent strength against compressive loads, and can maintain sealing performance against external pressure even when repeated loads are applied. Provided is a compact threaded joint in which external pressure seal sections (21, 31) and internal pressure seal sections (23, 33) are provided in front of and behind threaded sections (22, 32), a nose section (24) for maintaining internal pressure sealing performance is provided at the tip of a pin (2), and torque shoulder surfaces (25, 35) are provided at the tip of the nose section (24). When a compressive load is applied, a portion of the compressive load is applied by contact between the insertion surfaces of the threaded portions (22, 32). Furthermore, by reducing the shoulder angle (theta) of the torque shoulder surfaces (25, 35), the amount of press-fit of the male buckle (2) with respect to the female buckle (3) and the amount of radially inward shrinkage deformation of the opening end of the female buckle (2) when a compressive load is applied are reduced, and accumulation of damage in the vicinity of the outer sealing surface is suppressed.

The application provides a lattice structure modeling method under tensile and compressive load conditions and a derived lattice structure, and realizes lattice structure design under tensile and compressive load conditions. The method comprises the following steps: designing an original solid cell structure; performing generative topological optimization on the original solid cell to obtain a lattice topological configuration under multi-directional uniform tensile load and unidirectional dominant tensile load conditions; reconstructing the lattice structure obtained by the generative topological optimization; evaluating the manufacturability of the reconstructed lattice structure; performing derivative design on the reconstructed lattice structure to improve the manufacturability and bearing capacity thereof; and after the design is completed, preparing a corresponding lattice structure and performing performance testing. The application designs a lattice structure under tensile and compressive load conditions, and reduces the performance difference between the actual manufacturing structure and the design structure through structural adjustment, so that the obtained lattice structure has higher lightweight degree, specific stiffness and specific strength, and can be widely used in the fields of automobiles, aerospace and the like.

A threaded joint (1) having a longitudinal axis (x), wherein a first tubular component (C1) and a second tubular component (C2) are threaded together, a first axial length BSL between a female internal stop surface (23) and a female external stop surface (21) is greater than a second axial length PSL between a male internal stop surface (13) and a male external stop surface (11), and the first axial length BSL and the second axial length PSL form a gap (30) between the male external stop surface (11) and the female external stop surface (21), the gap (30) being closeable by contact between the male external stop surface (11) and the female external stop surface (21) when an axial compressive load is applied.

A fastener includes a sleeve including: a first end and a second end; a tubular portion having an outer surface and an inner surface; a recess formed in the outer surface between the first end and the second end; and an internal thread located within the internal surface at the second end. The fastener includes a core bolt including a cylindrical portion, an external threaded portion, and a screw tail between the cylindrical portion and the threaded portion. The core bolt is configured to be disposed within the sleeve. The external threaded portion is configured to threadedly engage the internal thread of the sleeve. Mounting movement of the core bolt within the sleeve generates a compressive load on the sleeve. The groove is configured to facilitate formation of a ball portion in the sleeve in response to the compressive load.

To provide a base material for packaging which is excellent in cushioning property, a base material for packaging which is excellent in flexibility, a material for packaging using the base materials for packaging, and a method for manufacturing a material for packaging.SOLUTION: There are provided a base material for packaging containing natural fibers in which a basis weight is 18 g / m2 or more and 50 g / m2 or less, and compressive strength (one base material to be measured, deformation rate of 0.02 mm / sec, initial compression load of 50 gf / cm2, and maximum compressive load of 300 gf / cm2) that is measured using a KES-G5 compression testing machine is 1.5 or less; a material for packaging which has a heat seal layer on at least one surface of the base material for packaging, and heat seal strength when being heat sealed at a temperature of 130°C and a pressure of 1.0 kgf / cm2 for 1 second, and being peeled at a tension rate of 30 mm / min by a T type of 0.5 N / 15 mm or more; and a method for manufacturing a material for packaging which coats a coating liquid containing a thermoplastic resin onto the base material for packaging by a gravure method or a flexographic method, and thereby forms a heat seal layer.SELECTED DRAWING: Figure 1

The invention discloses a simulation test device and method for the integrity of an underground coal gasification string. The device mainly includes a load loading device, a test string, a temperature reduction device and a heating device. A tensile / compressive load is applied to the test string through the load loading device to test the strength of the test string; cooling circulating water is pumped into the outer wall of the test string through the temperature reduction device to adjust the temperature; the temperature inside the test string is adjusted through the heating device. The simulation test device and method for the integrity of the underground coal gasification string of the invention can simulate the change of the bearing capacity of the string under the ultra-high temperature environment of underground coal gasification, and can also simulate the change of the bearing capacity of the string for heavy oil fire flooding, providing a test evaluation means for the selection of oil casing in high-temperature wells. Through the invention, the change rules of the structural strength and sealing performance of the string under different downhole working conditions can be obtained, and effective string specifications and models can be selected according to the operating pressure and temperature range, effectively reducing the cost of coal gasification mining.

A rail assembly for a chassis frame of a vehicle, such as a heavy-duty truck, may include a pair of rails offset from each other. Each of the pair of rails may include a first rail member formed of a first material and a second rail member formed of a second material. The first rail member may be fixedly coupled to the second rail member to form an elongate load-bearing beam structure comprising different materials. A density of the first material may be less than a density of the second material. The elongate load-bearing beam structure may be configured such that a compressive load is applied to the first rail member within a central region of the elongate load-bearing beam structure in static conditions and a tensile load is applied to the second rail member within the central region of the elongate load-bearing beam structure in static conditions.

Methods for directly bonding two or more articles of polycthcr ether ketone (PEEK) arc provided. The method includes treating bonding surfaces on the two or more articles of PEEK. The method includes placing the treated bonding surfaces of the two or more articles of PEEK into contact with each other. The method further includes heating the two or more articles of PEEK for a pre-determined time at a pre-determined temperature between 250 °C and the melting point of the PEEK. The method additionally includes applying a pre-determined compressive load to the two or more articles of PEEK during heating. Fluid handling devices, such as manifolds and filters, formed using methods of the disclosure are also disclosed.

An assembled sucker rod includes a rod body with a rod end and an endpiece containing a receptacle at the rod end. An adhesive is set between the receptacle and rod end, and an insert is positioned through the endpiece's side, contacting the rod end, and resisting compressive loads. The endpiece has apertures for the insert, which has ends and an intermediate portion; the latter contacts the rod end compressively, while the ends contact the endpiece oppositely. The rod end may feature a hole or slot for the insert, or its distal portion may directly abut the insert.

This invention discloses a device for determining the compressive plasticity stage of recycled concrete based on acoustic emission and stress-strain analysis. The device includes: applying axial compressive loads to recycled concrete specimens under different working conditions, simultaneously measuring their acoustic emission signals and compressive stress-strain curves, and outputting an Excel spreadsheet containing the time, cumulative acoustic emission energy value, acoustic emission b-value, stress, and strain. A GUI interface is constructed using MATLAB, creating execution buttons, input boxes, result display areas, and graphical display areas. Callback functions for file selection and monitoring are defined based on the GUI interface. Acoustic emission, b-value, stress, and strain data are extracted from the specified Excel worksheet and interpolated. Functions are called to detect yield strength and the time and strain of complete failure, and the results are output. This invention can quickly detect the plasticity stage of materials by processing acoustic emission and stress-strain data, making data processing and result display more intuitive.

To provide a roll press device capable of miniaturizing the whole device without lowering compression load to a workpiece.SOLUTION: Provided is a roll press device for conveying a workpiece W while applying compression load to the workpiece between a pair of rolls which are vertically provided and both ends of which are rotatably held by bearings, where a plurality of pairs of rolls 4, 5, and 6 are provided so as to be shifted in a width direction of the workpiece W.SELECTED DRAWING: Figure 1

The invention discloses a high-temperature internal pressure tensile torsion composite fatigue test system, and relates to the technical field of material mechanical property tests.The high-temperature internal pressure tensile torsion composite fatigue test system comprises a furnace body, clamp assemblies are arranged in the furnace body, and the clamp assemblies are used for clamping the two ends of a test piece; the axial loading device is in transmission connection with the clamp assembly and can apply an axial tensile load, an axial compression load and an axial torsion load to the test piece; the annular internal pressure loading device is communicated with the clamp assembly through a pipeline and can introduce gas with set pressure into the test piece through the clamp assembly so as to apply annular internal pressure to the test piece; the temperature control device is connected in the furnace body and can heat the test piece to a set temperature; the measuring assembly can detect deformation data of the test piece in real time. According to the invention, various loads can be applied during the fatigue test, so that the high-temperature real service characteristics of the pipe can be truly reflected.

To provide an embedding method that can simplify equipment and suppress an increase in the number of work steps.SOLUTION: An embedding method includes: a first step S1 of forming an embedding hole in a target location; a second step S2 of placing a cylindrical embedded member and a tension member that is placed inside the embedded member and connected to a longitudinal end of the embedded member, into the embedding hole formed in the target location in the first step S1; a third step S3 of operating the tension member placed in the embedding hole in the second step S2 in a direction going out of the embedding hole to apply a compressive load to the embedded member and cause a part of the embedded member to protrude radially outward; and a fourth step S4 of injecting a hardening material into the embedded member and hardening the hardening material to fix the embedded member to the target location.SELECTED DRAWING: Figure 10

The present invention discloses a high-load-bearing multi-directional chiral quasi-zero vibration isolator based on a chiral torsion design, comprising a base and a chiral torsion buckling unit; the chiral torsion buckling unit comprises a mounting part, a rotating part and a plurality of elastic elements, the rotating part is rotatably connected to the base, the mounting part is coaxially arranged above the rotating part, and the elastic elements are connected between the mounting part and the rotating part at periodic intervals along the circumferential direction; when the chiral torsion buckling unit has no external load, the elastic elements are in an inclined state. The chiral torsion buckling unit will undergo chiral torsion deformation under the action of an external compressive load, generating a buckling platform stress, i.e., a quasi-zero stiffness stage with a dynamic stiffness close to 0. A positive stiffness spring can also be connected in parallel to the chiral torsion buckling to avoid instability caused by torsion and enhance the overall load-bearing capacity. In addition, the vibration isolator has low tangential stiffness, realizes multi-directional low-frequency quasi-zero vibration isolation, and has a compact structure, which effectively solves the problem that the quasi-zero stiffness vibration isolator has low load-bearing capacity and can only act in one direction.

The utility model discloses a house building pile foundation reinforcement cage framework which comprises a reinforcement cage mechanism, the reinforcement cage mechanism comprises an annular steel base, and the top of the annular steel base is fixedly connected with a reinforcement cage. The house building pile foundation reinforcement cage framework further comprises an anti-deformation pulling and anchoring mechanism fixedly connected into the reinforcement cage. The anti-deformation pulling and anchoring mechanism comprises a plurality of I-shaped plate pulling and fixing pieces fixed to the reinforcement cage. The I-shaped plate pulling and fixing piece comprises I-shaped steel, the I-shaped steel comprises end steel parts arranged on the two sides at intervals and a connecting steel part integrally formed between the end steel parts, and a plurality of first pulling and anchoring bars are fixedly connected to the connecting steel part. The first pull anchor bars are fixed on the reinforcement cage, and the end steel parts are fixedly connected with a plurality of second pull anchor bars; and the second pull anchor bar is fixed on the reinforcement cage. According to the device, the compressive load resistance and the deformation resistance under the high-voltage load of the pile foundation are greatly improved, so that the safety and the stability of a building system are improved, and the device can be used for the pile foundation of a high-rise building system.

To provide a connection structure and a connection method for steel pipes without requiring welding and bolts.SOLUTION: A connection structure 1 for steel pipes is configured to connect a first pipe end part 11 and a second pipe end part 22 by covering the first pipe end part 11 of a first steel pipe 10 with the second pipe end part 22 of a second steel pipe 20, wherein at least the second end part 22 of the second steel pipe 20, in which a slit 23 extended in a pipe axis direction and cut-out to an outside in the pipe axis direction, constraints the first pipe end part 11 of the first steel pipe 10 with compression load in a radial direction.SELECTED DRAWING: Figure 1