91 results about "Compression stress" patented technology

This invention provides a split Hopkinson bar device for achieving single-pulse loading, comprising an incident bar, a transmission bar, an incident wave-catching unit, and a stress wave generating unit. The incident wave-catching unit includes an incident wave-catching sleeve and an absorbing bar. One end of the absorbing bar is spaced apart from the incident bar flange, and the other end is connected to the absorbing bar flange. The incident wave-catching sleeve is fitted around the absorbing bar, with its two ends respectively fitting against the absorbing bar flange and the incident bar flange. The compressive stress wave generated by the stress wave generating unit is reflected by the incident bar flange to form a tensile stress wave. After loading the sample, a portion of the stress wave is reflected back as a compressive wave and absorbed by the incident wave-catching unit. This solves the problem of multiple reflections and interference in traditional Hopkinson bars, achieving pure single-pulse tensile loading. The device is compact, has high energy utilization, and is suitable for testing the dynamic mechanical properties of materials.

A glass article and associated brush polishing method are described. The glass article includes a polished edge extending between a first major surface and a second major surface. The polished edge exhibits at least one of: (a) an Ra surface roughness greater than or equal to 1 nm and less than or equal to 20 nm; (b) a root mean square surface roughness greater than or equal to 1 nm and less than or equal to 30 nm; and (c) a peak valley surface roughness greater than or equal to 10 nm and less than or equal to 50 nm. The glass article is strengthened prior to brush polishing such that a majority of the polished edge is not under compressive stress. The brush polishing process is performed such that the first compressive stress layer extends to the polished edge.

The utility model relates to the technical field of special-shaped monofilament drawing die, concretely to a special-shaped monofilament drawing die with optimized R angle, including the drawing powder box, the outer wall of drawing powder box penetrates and has the copper monofilament of sliding installation, the left -hand end fixed mounting of drawing powder box has the optimization mould, the top of drawing powder box is provided with cooling device, the utility model discloses through the setting of R angle optimization section, through the big opening and R angle pre-shrinkage guide of entry section, the buffer section releases the shrinkage stress through the trapezoidal decreasing structure layering, R angle optimization section adopts the gentle circular arc surface dispersion compression stress, and the gradual change R angle transition forms the stress transition zone of round continuous when reducing the section, effectively inhibits the surface crack and ensures the shape accuracy, the final ejection section passes through the gentle transition stable wire form, and synchronous elimination resilience stress, thereby realizes the special-shaped cold drawing forming of copper monofilament high accuracy, high smoothness.

One embodiment relates to a heat-conducting sheet containing graphite particles (A) including at least one selected from the group consisting of scale-like particles, ellipsoidal particles, and rod-like particles, the graphite particles (A) being oriented in a thickness direction, and a compression rate of thickness being 24% or more at a temperature of 150°C and a compression stress of 0.14 MPa.

The present invention relates to a glass sheet comprising a first main surface, a second main surface, and an end surface connecting the first main surface and the second main surface, having a compressive stress layer, the length of the longest crack in a region from a position 9% of the thickness away from the end of the first main surface side of the end surface toward the second main surface side to a position 91% of the thickness away from the end of the first main surface side of the end surface toward the second main surface side is 5 μm to 20 μm, and the length of the longest crack in a region from the end of the second main surface side of the end surface to a position 6% of the thickness away from the end of the second main surface side of the end surface toward the first main surface side satisfies a specific formula.

Implementations of the present disclosure generally relate to liner layers and methods of forming liner layers for through glass vias. In one or more implementations, a liner layer is deposited on a glass substrate having a plurality of vias disposed through the glass substrate. The method includes depositing an adhesion layer onto and in a via of the plurality of vias to form the adhesion layer, the adhesion layer having a thickness of about 100 Angstroms to about 550 Angstroms, a tensile stress of about -30 MPa to about 80 MPa, and a Young's modulus of about 115 GPa to about 200 GPa and depositing a second layer onto the adhesion layer, the second layer having a thickness of about 2,000 Angstroms to about 60,000 Angstroms, a compressive stress greater than about -50 MPa, and a Young's modulus of about 35 GPa to about 70 GPa.

A method for manufacturing a semiconductor device includes the following steps: for a heat generating body and a heat radiating body disposed with a heat conductive sheet therebetween, applying pressure in a thickness direction of the heat conductive sheet to bond the heat generating body and the heat radiating body via the heat conductive sheet, the heat conductive sheet having a compression elastic modulus of 1.40 MPa or less at a compression stress of 0.10 MPa at 150°C and an adhesive force of 5.0 N·mm or more at 25°C.

The application provides an active damping method and system for a reactor based on a magnetostrictive effect positive compensation, and belongs to the technical field of damping of power equipment; the method comprises the following steps: determining optimal compensation compression stress through analysis of a vibration source characteristic and mapping of a material characteristic; adopting a preset core compression structure, applying the optimal compensation compression stress in a core manufacturing and assembling stage, and maintaining the optimal compensation compression stress through a pre-tightening element; and performing vibration testing on the reactor after the optimal compensation compression stress is applied, and iteratively fine-tuning until a vibration suppression rate meets a preset target. The application can actively utilize and reshape the compensation mechanism of the magnetostrictive effect, so that the deformation generated by the magnetostrictive effect and the deformation of the electromagnetic force are offset, and the overall vibration of the reactor is greatly reduced from the source.

The present invention provides a chemically strengthened glass ceramic and a preparation thereof, the chemically strengthened glass ceramic comprises a glass ceramic matrix and a compressive stress layer formed on the surface of the matrix through chemical strengthening by ion exchange, the glass ceramic matrix comprises a crystal family 1 and a crystal family 2, the crystal family 1 comprises a crystal with the following structural formula: (ZnxMg1-x-yAl2-2y) (Al2yMgy) O4, wherein x is more than or equal to 0 and less than or equal to 1; 0 < = y < = 1; 0 < = x + y < = 1; the crystal family 2 comprises zirconium oxide; and the compression stress layer has a CTLDsaf value of 15000 to 70000 Mpa (Cyclic Transfer Layer Discharge Saf). Compared with an existing LAS microcrystalline glass system, the chemically strengthened microcrystalline glass has excellent mechanical properties and impact resistance, and the total cost is greatly reduced.

A compression element (80) for a mooring component comprises a plurality of shell pieces (42b, 42b'). Each shell piece has a first annular portion and a second annular portion and a middle portion extending between the first annular portion and the second annular portion. The first annular portion and the second annular portion lie in a plane perpendicular to a central axis of the compression element. The maximum dimension of the first annular portion in a direction perpendicular to the central axis is greater than the corresponding maximum dimension of the second annular portion. The shell pieces are arranged along the central axis such that the first annular portion or the second annular portion of one shell piece is joined to the first annular portion or the second annular portion of an adjacent shell piece. The compression element is arranged such that, when a compressive stress causes the compression element to be compressed, the middle portion of one shell piece contacts the middle portion of an adjacent shell piece.

The application discloses a preparation method of high-strength wide-burning-range prestressed magnesia daily-use porcelain and a product prepared by the method. A coating is introduced on the surface of a magnesia daily-use porcelain body through a coating technology, and the difference between the thermal expansion coefficients of different crystal phases is utilized, so that the thermal expansion coefficient of the surface of the body is reduced to generate a pre-compression stress, the effect of enhancing the bending strength of the body is realized, the thermal stability of the ceramic is improved, the demand problem of the magnesia daily-use porcelain for strength and thermal stability is solved, and the application has very important significance for the innovation and development of daily-use ceramic.

The utility model provides a rock debris sampler for geological prospecting, and relates to the field of geological prospecting, the rock debris sampler comprises a sampler body, the sampler body is movably sleeved with a connecting sleeve, the connecting sleeve is fixedly sleeved with a fixing ring, and the surface of the fixing ring is fixedly connected with eight fixing plates; a supporting shaft is rotationally connected between every two adjacent fixing plates, the supporting shafts are fixedly sleeved with supporting legs, and torsional springs are fixedly connected between the supporting legs and the fixing plates. Through cooperation of the supporting legs, the fixed rings, the sliding rings, the first connecting pieces, the second connecting pieces, the transverse plates and other structures, a plurality of triangular stabilizing units are formed together, loads such as vibration and impact generated when the sampler works are converted into tension and compression stress in the transverse plates from concentrated stress at the joints of the supporting legs, and the stability of the sampler is improved. Therefore, the stress concentration phenomenon of connecting points of the supporting legs is effectively avoided, and the risk of fatigue fracture of welding points is effectively reduced.

The application belongs to the technical field of glass manufacturing, and particularly relates to high-aluminum glass and a preparation method. The raw material components include SiO2 60.0-70.0%, Al2O3 10.0-20.0%, Na2O 3.0-6.0%, K2O 2.0-5.0%, Li2O 0.0-4.0%, CaO 1.0-5.0%, MgO 0.5-4.0%, ZrO2 1.0-4.0%, TiO2 0.5-3.0%, Y2O3 1.0-3.0%, and B2O3 0.5-1.0% in terms of mass percentage. The application adjusts the dosages of the components of the high-aluminum glass, so that the high-aluminum glass has excellent mechanical properties, a surface compressive stress (CS value) of greater than or equal to 1000 MPa, a stress layer depth (DOL) of greater than or equal to 100 microns, and excellent properties such as high hardness, high light transmittance, scratch resistance, drop resistance and high stability.

The invention provides a discrete ballastless track tension-compression fatigue damage rapid calculation method, which comprises the following steps of: uniformly measuring a complex stress state and a simple stress state through a damage energy release rate, and decomposing tension-compression effective stress by utilizing a fourth-order projection tensor, so that the tension-compression effective stress value is equivalent to a uniaxial tension-compression stress value under a uniaxial loading condition; constructing a hyperbolic function with a natural constant as a base and a damage variable as an index on the basis of the damage energy release rate and in combination with three-stage damage characteristics of high-cycle fatigue of the material; carrying out integration on fatigue loading times through tension and compression damage, and deducing to obtain a discrete transcendental differential function of the damage related to the loading times; function variables are defined, an initial value is set, an iteration format is established, the discrete transcendental differential function is solved through a numerical integration method, and a calculation result graph is drawn. The model is simplified, and the calculation efficiency is improved; a high-order tensor stress updating algorithm does not need to be constructed, redundant calculation is reduced, and the data processing efficiency and the calculation speed during parameter analysis are greatly improved.

The present application provides a kind of liquid ejection head and liquid ejection device for improving the ink weight of droplet ejected from nozzle and the resonance frequency of vibration plate.The liquid ejection head is, pressure chamber, vibration plate with first vibration plate, second vibration plate and third vibration plate, liquid ejection head with piezoelectric actuator stacked in sequence, in the plan view from the stacking direction of the vibration plate and the piezoelectric actuator, the pressure chamber is provided with multiple in first direction side by side, in the first direction, in the first vibration plate and the second vibration plate, the part of piezoelectric layer and the third vibration plate is stacked, and the part of piezoelectric layer and the third vibration plate is not stacked, one of the first vibration plate and the second vibration plate has compressive stress, and the other has tensile stress, the Young's modulus of the third vibration plate is greater than the Young's modulus of the first vibration plate and the second vibration plate.

The utility model provides a horizontal joint connection prefabricated shear wall which comprises a prefabricated wall body, a plurality of shear grooves penetrating through the prefabricated wall body are formed in the prefabricated wall body, and steel plates are fixed to the lower groove bottoms of the shear grooves. And when the prefabricated wall bodies arranged up and down are connected, the connecting steel bars of the lower prefabricated wall body pass through the through mounting holes of the upper prefabricated wall body and the connecting mounting holes of the steel plates and then are locked and fixed with the upper prefabricated wall body through nuts and gaskets. The connecting structure is simple and reasonable in structural design, the upper shear wall and the lower shear wall are connected through the connecting steel bars matched with the nut gaskets, the steel plates are further designed at the bolt and nut locking positions for positioning, tension and compression stress can be effectively transmitted through the steel plates, insertion space is provided for bolt connection, and the stress performance of the connecting structure of the shear walls is effectively balanced and stabilized; damage to the wall caused by stress is avoided, and endurance and stability of the joint are improved.

A strengthened glass article having a cylindrical sidewall with an outer surface, an inner surface, and a radial thickness extending between the outer surface and the inner surface in a radial direction is provided. The strengthened glass article has an asymmetric axial stress profile including: an outer compressive stress region extending radially inward from the outer surface to an outer depth of compression (outer DOC); an inner compressive stress region extending radially outward from the inner surface to an inner DOC; and a central tension region disposed radially between the outer DOC and the inner DOC. The asymmetric axial stress profile has an outer elbow in compression, and the outer elbow is a region on the asymmetric axial stress profile proximate the outer surface and at which a slope of the axial stress profile changes magnitude.

Provided is an ultra-thin glass having excellent mechanical strength. In particular, the present invention provides an ultra-thin glass having excellent mechanical strength by controlling the compressive stress based on the glass composition.

The invention discloses a large-span tunnel bearing arch stability analysis method based on compressive and tensile safety coefficients, and relates to the technical field of tunnel and underground engineering construction data analysis, and the method comprises the following steps: obtaining cavern geometry, surrounding rock mechanical strength, ground stress and support parameters; a bearing arch formed by anchoring and shotcreting reinforcement is simplified into an arched beam with the two ends elastically and fixedly connected to the side walls; determining a plastic loosening area of the top plate through numerical simulation, and taking the self weight as a main vertical load; calculating key section internal force and edge normal stress of the bearing arch by using structural mechanics, and dividing the internal force and the edge normal stress into pressure stress and tensile stress; based on the natural strength parameters of the surrounding rock, the compression-resistant and tensile safety coefficients of all the sections are calculated, and the minimum value is used as a quantitative index for evaluating the overall stability of the bearing arch. According to the method, the quantitative mechanical model of the bearing arch is established, and the safety of the ultra-large-span tunnel roof anchor-shotcrete supporting structure is accurately and conveniently evaluated.

The invention relates to the technical field of union connecting structures, in particular to a union connecting structure for an outlet of a fracturing pump and a wing-shaped nut dismounting and mounting device. The union connecting structure comprises a union female head, a union male head and a wing-shaped nut, and a pressing auxiliary boss is arranged in the middle of the inner side of the wing-shaped nut; the male union head and the female union head are arranged on the two sides of the pressing auxiliary boss in a bilateral symmetry mode and connected with the inner side of the wing-shaped nut through threads, the male union head and the female union head are sealed through an outer sealing assembly and the wing-shaped nut, and the outer sealing assembly comprises a hard metal ring and a rubber seal. A hard metal ring and a rubber seal are sequentially arranged between the left end of the male union and the right side of the pressing auxiliary boss from left to right. The union is reasonable and compact in structure and convenient to use, direct contact is avoided when the male union head and the female union head are pressed by arranging the pressing auxiliary boss, shear stress and pressing stress existing in traditional connection are converted into single axial pressing force, material abrasion is greatly reduced, and the service life is prolonged.

The invention relates to an ultrathin chemically tempered glass article having a thickness of less than or equal to 0.4 mm. In order to improve sharp object contact resistance, the glass article has a rupture force (given in N) greater than 30 times the thickness (t) of the glass article (t given in mm). Further, the glass article has a fracture bending radius (given in mm) less than 100,000 multiplied by the thickness (t) of the glass article (t given in mm) divided by the value of surface compressive stress (in MPa) at the first surface.

A glass composition comprising: 40-60 mol. % SiO2; 14-30 mol. % Al2O3; 1-10 mol. % Li2O; 15-30 mol. % Na2O; 1-20 mol. % MgO; 0-10 mol. % CaO; 0-5 mol. % P2O5; and a Young's modulus of 82 GPa or less. A glass-based article comprising: a compressive stress layer extending from a surface of the glass-based article to a depth of compression; a potassium layer extending from the surface of the glass-based article to a potassium depth of layer; a central tension region; a thickness; and a glass composition at a center of the glass-based article comprising: 40-60 mol. % SiO2; 14-30 mol. % Al2O3; 1-10 mol. % Li2O; 15-30 mol. % Na2O; 1-20 mol. % MgO; 0-10 mol. % CaO; and 0-5 mol. % P2O5; wherein a glass having the same composition and microstructure as the glass composition at the center of the glass-based article has a Young's modulus of 82 GPa or less; and optionally wherein the compressive stress layer comprises a maximum compressive stress of 1400-2000 MPa.

Provided is a method for molding a plate material, in which unexpected deformation of the material due to relative advancement can be prevented, and the plate thickness of an annular protrusion can be increased in a large range including a necessary range by a simple manufacturing process. This method for molding a plate material comprises: a step for molding a specific plate part and a side wall part; a step for molding an annular bent portion connected to the side wall portion; a step for forming an annular protrusion in which the plate thickness is selectively increased by deforming at least the annular bent part; in the step of molding the annular protrusion, the annular bent portion is supported by a support member that is relatively movable in a second direction opposite to a first direction in which the molded annular protrusion protrudes, and a pressing force in the first direction is applied to the specific plate portion to generate a compressive stress in the second direction in the side wall portion. And at least a part of the plate material constituting the side wall portion is moved on the support surface of the support member, thereby forming an annular protrusion having a selectively increased plate thickness.

A method of producing glass-based articles having sections of different thicknesses is provided, where a maximum central tension in a thinner section is less than that of a thicker section. The method includes reducing the thickness of a region of a glass-based article that includes a compressive stress layer extending from a surface to a depth of compression to form a glass-based article with multiple thickness regions, and then ion exchanging the glass-based article to form a stress profile in the thinner region that has a maximum central tension that is less than a maximum central tension of a stress profile of the thicker region. The glass articles produced by the method are also provided.

This invention relates to an ultrathin chemically tempered glass article with a thickness of 0.4 mm or less. To improve resistance to impact from sharp objects, the fracture height (given in mm) of the glass article is greater than 50 multiplied by the thickness (t) of the glass article (t given in mm). Furthermore, the fracture bending radius (given in mm) of the glass article is less than the result of multiplying 100,000 by the thickness (t) of the glass article (t given in mm) and dividing by the value of the surface compressive stress (in MPa) measured at a first surface.

The utility model discloses a quick -wearing type steel structure connecting piece relates to steel structure connecting piece technical field, the utility model discloses a steel column is provided with connecting assembly, moving assembly, positioning assembly and clamping assembly respectively, connecting assembly is fixedly installed with the outer surface of steel column in its inside to make connecting assembly support steel column, moving assembly is fixedly connected with one side of positioning assembly, to make moving assembly drive positioning assembly and position steel column, the outer surface of clamping assembly is slidably arranged with the inside of moving assembly to make clamping assembly carry out clamping location to the rotation angle of moving assembly. The utility model makes rotary drum move along the direction of telescopic link, and rotary drum can compress the spring of one side fixed, and then the compression stress of spring can always push rotary drum and one end of clamping cylinder to keep clamping arrangement, and the clamping groove can avoid rotary drum reverse rotation to limit the rotation direction of threaded rod with cooperation telescopic link and mounting disc.

This stator core manufacturing method includes: a step for preparing a core material which includes a plurality of core pieces including yoke parts and tooth parts, and in which some of the yoke parts of the adjacent core pieces are connected by connection parts; a step for temporarily shaping the core material into an annular shape by winding the plurality of core pieces while bending the core pieces at the connection parts; and a step for pressing one or more of the connection parts of the core material temporarily shaped into the annular shape to apply a circumferential compressive stress to the plurality of core pieces.

To provide a novel glass article.　Provided is a glass article having a refractive index of 1.60 or more and a compressive stress layer on a surface, wherein the value of the product of the compressive stress layer depth DOL and the surface compressive stress CS is 18,000 MPa∙μm or more.

The application discloses an overflow forming annealing device with improved drawing amount and a design method thereof, and belongs to the technical field of glass substrate manufacturing. A mature glass substrate overflow forming annealing device is selected as a design blueprint, geometric structure parameters, specific parameters and common parameters thereof are obtained as design references, a length similarity relationship of a thickness forming area is established, and a similarity relationship of lengths and heater powers of a pre-annealing area, a soaking area, an annealing area and a subsequent annealing area is established. According to the established similarity relationship, length parameters of the overflow forming annealing device with improved drawing amount are obtained, and the design of the glass substrate overflow forming annealing device is completed. By using the design method, the problem of a long cooling distance in traditional theory is overcome, more accurate, efficient and low-cost overflow forming annealing device design is realized, key forming quality indexes such as thickness, compression, stress and warping of the glass substrate are effectively guaranteed, and remarkable benefit improvement is brought to the glass substrate manufacturing industry.