18 results about "Compressive load" patented technology

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.

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.

This disclosure relates to a method and apparatus for reducing weld residual stress in steel structures with weld lines. Specifically, the method for reducing weld residual stress includes the steps of: plastically deforming a target deformation region by contacting a disk with the target deformation region and applying a compressive load to the target deformation region by means of a rotating disk, the target deformation region being a base material region near the interface between the weld bead of the weld line and the base material; and conveying the steel structure or disk such that the indentation caused by the plastic deformation extends in the target deformation region along the weld line in a continuous linear shape.

A structure fabricated by a method comprising hanging a flexible fabric from a first overhead structure in a substantially vertical orientation, wherein a portion of the flexible fabric hangs without any compressive load bearing framework engaged therewith and bears a tensile load. The method further comprises shielding a first portion of the flexible fabric to substantially block the first portion from receiving a fixative, and applying the fixative directly to a second portion of the flexible fabric that is unshielded, wherein the fixative hardens the second portion forming a fixed portion while the first portion remains flexible. The method further comprises rotating the fixed portion about the first portion acting as a hinge into a second orientation.

A seal assembly which has a housing that defines a channel. A conduit first end, of a conduit which has a central axis, extends into the channel. The conduit first end defines a tip portion of the conduit. The seal assembly further has a radial protrusion that is disposed adjacent the tip portion of the conduit first end. The seal assembly further has a seal element, which extends about the tip portion of the conduit first end. The seal element is fully enclosed by the housing, the tip portion of the conduit, and the radial protrusion. The seal assembly further has a biasing assembly, which is configured to exert an axial compressive load on the seal element via the radial protrusion and the housing. The seal element is configured to urge against the housing, the tip portion of the conduit, and the radial protrusion by the axial compressive load.

The present invention provides a thermally conductive composition having a high thermal conductivity with the compressive load and the degree of plasticity being kept low, a thermally conductive sheet using the thermally conductive composition, and a method for producing the thermally conductive sheet. The thermally conductive composition contains a matrix resin (component A) made of a thermosetting resin, a curing catalyst, and thermally conductive particles (component B). 1500 to 3000 parts by mass of the component B is blended with respect to 100 parts by mass of the component A. The component B includes the following components B1, B2, B3, and B4. The component B includes, relative to the total amount of the component B, 10 to 20 mass % of aluminum nitride with a median diameter (D50) of less than 20 μm (component B-1); 3 to 9 mass % of aluminum nitride with D50 of 20 μm or more (component B-2); 50 to 60 mass % of alumina with D50 of 60 to 80 μm (component B-3); and 11 to 37 mass % of alumina with D50 of less than 60 μm (component B-4). The blending ratio (B-1) / (B-2) of the component B-1 to the component B-2 in terms of mass is 1.2 to 3.

This utility model relates to the field of cement blanket technology and discloses a novel high-strength cement composite mat, comprising a cement matrix layer, rubber particle interlayers fixedly connected to both sides of the cement matrix layer, non-woven geotextile fixedly connected to the sidewalls of the rubber particle interlayers, reinforcing threads fixedly connected inside the non-woven geotextile, and a polyurethane coating on the sidewalls of the non-woven geotextile. The reinforcing threads penetrate the rubber particle interlayers and the cement matrix layer. In this utility model, the cement matrix layer serves as the core to bear the compressive load, the rubber particle interlayers on both sides buffer stress and reduce cracking, the non-woven geotextile blocks external particles and prevents the influence of impurities, the reinforcing threads enhance tensile and tear resistance and improve stability, and the polyurethane coating resists natural erosion and aging. All components work together to solve the problems of easy cracking and damage in traditional cement products, and improve resistance to the external environment.

A multimaterial mechanical metamaterial (MMM) system for multi-directional load dissipation includes a rigid structural framework made of a first material, including left, right, and middle structures. This framework houses elastic bars made of a second, more elastic material. Upon application of a compressive load, the geometry of the rigid framework causes horizontal bars to stretch, dissipating a first portion of the load in an orthogonal direction. As deformation increases, the framework engages the middle structure, causing a vertical bar to stretch and dissipate a second portion of the load in a direction opposite to the initial applied load. A method for using the MMM system for protection against compressive loads provides a sequential, two-stage mechanism for energy absorption and force redirection. The method includes placing the MMM system between a subject and a compressive load.

A compression indication tool can include a flow passage and a valve that in a closed configuration prevents fluid communication between the flow passage and an exterior of the tool, and in an open configuration permits fluid communication between the flow passage and the exterior of the tool. The valve is opened in response to application of a predetermined longitudinal compressive load to the compression indication tool. A method can include connecting a compression indication tool in a tool string, the tool including a valve that prevents fluid communication between an interior flow passage and an exterior of the tool, deploying the tool string into the well, and applying a predetermined longitudinal compressive load to the tool string, thereby opening the valve to permit fluid communication between the interior flow passage and the exterior of the tool.

A strength testing apparatus is provided that can investigate the strength corresponding to the crushing position of the test specimen. The strength testing apparatus (1) is an apparatus for performing a strength test by applying pressure to the test specimen (5) between the base (3) and the slide (4) of the stamping machine (2). The strength testing apparatus (1) includes: a mounting fixture (6) on which the test specimen (5) is mounted; and a flat plate fixture (7) mounted on the slide (4) and having a contact surface (7a) for the test specimen (5) to abut against the opposite side of the mounting fixture (6). In addition, the strength testing apparatus (1) includes: a load measuring unit (10) clamped between the slide (4) and the flat plate fixture (7) and measuring the compressive load (P) applied to the test specimen (5); a displacement measuring unit (20) measuring the position of the slide (4); and a data accumulation unit that outputs the compressive load (P) measured by the load measuring unit (10) in association with the position of the slide (4) measured by the displacement measuring unit (20).

A flexible steel strip and intelligent gasket adaptive roadway support system and method, belonging to the field of roadway support technology, is disclosed. The system comprises: a flexible steel strip laid on the roadway surface with anchor bolt holes and a serrated edge at the lower edge; intelligent gaskets with low and high friction surfaces on their upper and lower surfaces, respectively; the intelligent gaskets are placed on the steel strip; the anchor bolt extends through the gasket and steel strip into the borehole; a tray and nut are fitted onto the exposed section of the bolt, with the nut pressing the tray and gasket firmly onto the steel strip. The method involves: measuring the radius of curvature of the roadway cross-section; during construction, the steel strip adheres to the roadway wall using its own weight; the anchor bolt is anchored after passing through the gasket and steel strip, and an initial preload is applied; when the surrounding rock load exceeds a critical value, the low-friction surface of the gasket slides against the tray to achieve controllable pressure relief and release the deformation energy of the surrounding rock; the sliding increases the anchor bolt's compressive load, and the ultimate static friction force of the high-friction surface of the gasket increases synchronously; when the surrounding rock load falls below the ultimate friction force, the sliding terminates, and the support structure automatically locks. This invention significantly improves construction efficiency and the dynamic adaptability to surrounding rock.

A method for modifying a steel product according to the present invention comprises a nitriding step of nitriding a steel material to form on a surface of the steel material a compound layer L1 in which iron and nitrogen are combined and a diffusion layer L2 in which alloy nitrides have precipitated, and a compression step of applying a compressive load to the surface of the nitrided steel material.

This invention discloses a test specimen and method for testing the compressive-shear fracture of metallic materials under high temperature and high strain conditions. The specimen is a one-piece molded structure. The specimen substrate is a cylinder with symmetrically arranged inclined grooves on its circumferential surface, each with a cylindrical bottom, and a predetermined thickness is maintained between the two inclined grooves. At both ends of the inclined grooves are excised regions that penetrate the substrate and are centrally symmetrically distributed about the center point of the substrate. Each excised region consists of a main arc segment, lateral arc segments, and transition fillets. The center of the main arc segment is offset by a predetermined amount both parallel and perpendicular to the centerline of the inclined groove. This invention utilizes the cooperation between the inclined grooves and the end excised regions to form an interlaced central deformation zone in the middle of the substrate. Under axial compressive load, the induced central deformation zone is in a stable compressive-shear combined stress state. The stress state can be effectively controlled by adjusting structural parameters such as the inclined groove angle and the thickness of the deformation zone, thus providing a reliable basis for the study of the compressive-shear fracture behavior of metallic materials under high temperature and high strain conditions.

To provide a cushion that is thin and lightweight while offering a high-quality, comfortable seating experience. [Solution] The cushion 10 comprises a cushion body 20, which is formed at least in part from an elastic foam and has an internal space 23, and a wave spring 30 disposed within the space 23 and having elastic force in the thickness direction of the cushion body 20. The wave spring 30 is formed as an annular or cylindrical shape overall and is formed in a wave shape along its circumferential direction, thereby generating an elastic restoring force against a compressive load in the thickness direction, and consists of a linear elastic body 31.

This invention belongs to the field of compressive strength testing technology and discloses a compression test method and apparatus for the chamfered zone of a sandwich structure. The compression test method includes the following steps: obtaining characteristic parameters of the chamfered zone of the sandwich structure to be tested; preliminarily determining the configuration dimensions of the test piece based on the characteristic parameters; preliminarily determining the boundary constraints for loading the test piece; conducting simulation analysis of the compression test on the test piece according to the preliminarily determined configuration dimensions and boundary constraints; adjusting and determining the final configuration dimensions and boundary constraints of the test piece according to the simulation analysis; manufacturing the test piece and test fixture according to the final configuration dimensions and boundary constraints; clamping and fixing the test piece to the test fixture, performing a compression test on the test piece, and obtaining test data of the chamfered zone of the test piece. This invention can accurately obtain the destructive strength and failure risk points of the chamfered zone of the test piece under compressive load.

Fall energy absorbing device (1) comprising a first pulling element (2) comprising a first anchoring portion (4) connected to a first base portion (6) through a first connecting portion (8); a second pulling element (3) comprising a second anchoring portion (5) connected to a second base portion (7) through a second connecting portion (9) and configured to move relative to the first pulling element (2) along a longitudinal direction (L); a honeycomb structure (10) comprising a plurality of interconnected open cells (11) configured to absorb energy through plastic deformation of said cells (11) in response to a compressive load applied in a longitudinal direction (L) to opposite bases (12,13) of the honeycomb structure (10); wherein the first and second base portions (6,7) are in contact with the opposite bases (12,13) of the honeycomb structure (10) such that, when the first and second anchoring portions (4,5) are moved away from each other along said longitudinal direction (L), the first and second base portions (6,7) press against the bases (12,13) of the honeycomb structure (10) thereby compressing the honeycomb structure (10) in the longitudinal direction (L); wherein the honeycomb structure (10) exhibits a crush strength, in the longitudinal direction (L), that is comprised between a first value that is inversely proportional to a pressed area of the base (12,13) of the honeycomb structure (10) for a given arresting force, and a second value that is inversely proportional to the pressed area of the base (12,13) of the honeycomb structure (10) and to a height (H) of the honeycomb structure (10) for a given fall energy.

Instead of using a bending load on the pin to prevent the slide from falling, this system uses a compressive load to prevent it from falling. [Solution] In a device for preventing a press machine slide from falling, the slide fall prevention member is inserted between a protrusion provided on a part of the piston to which the slide is fixed and a cylinder that causes the piston to reciprocate, thereby stopping the downward movement of the slide and preventing the slide from falling. By inserting the slide fall prevention member between the protrusion provided on a part of the piston and the cylinder, the protrusion and the upper end of the slide fall prevention member come into contact, thereby preventing the slide from falling.