157 results about "Compression stress" patented technology

The application discloses a transparent strengthened glass ceramic with high stress depth, which contains spinel crystals and zirconia crystals in a crystal phase of the strengthened glass ceramic, and does not contain Li-containing crystals; the strengthened glass ceramic has a compressive stress region extending from a surface thereof to a compression depth, a compressive stress layer depth DOL_0 of the strengthened glass ceramic is greater than or equal to 14% of a thickness of the strengthened glass ceramic, and a tensile stress line density of the strengthened glass ceramic is greater than or equal to 25000 MPa / mm. By introducing more Li ions and Na ions into a spinel glass ceramic component, the prepared transparent spinel glass ceramic can be chemically strengthened, a transparent strengthened glass ceramic with high CS, DOL_0, CT_AV and CT_LD is obtained, and the strengthened glass ceramic exhibits excellent drop resistance.

The invention relates to the field of steel member engineering, in particular to a high-strength steel combined multi-chamber box-section bent steel member and a manufacturing method thereof, and the manufacturing method comprises the following specific steps: S1, obtaining the design form of the steel member; s2, preparing an outer side chamber of the steel member; s3, prestress is applied to the outer side chamber in the axial direction of the outer side chamber so that the outer side chamber can be bent to a first form, a first eccentric value of the first form is obtained, and the first eccentric value is larger than the designed eccentric value; s4, top pressure towards the inner side of the bend is applied to the first form to a second form, the second form is in a pre-tightening state, a second eccentric value of the second form is obtained, and the second eccentric value is smaller than the designed eccentric value; s5, the outer side chamber is kept in the second form, and the matched inner side chamber is welded to obtain the steel member; and S6, after the force is unloaded, the inner side chamber is subjected to pre-tensile stress, the outer side chamber is subjected to pre-compressive stress, and the steel member is obtained. Pre-tensile stress is applied to the inner side of the steel member, pre-compressive stress is applied to the outer side of the steel member, and therefore the axial compression buckling ultimate load of the bent steel member is increased.

The invention relates to a temperature and continuous compression stress relaxation coupled O-shaped rubber sealing ring service life prediction method, and belongs to the technical field of nuclear power equipment material detection. According to the method, compression stress relaxation tests of the O-shaped rubber sealing ring are carried out at different temperatures, relational data of compression stress relaxation, time and temperature are obtained, a physical information neural network is adopted for data fitting, and a quantitative prediction model is established. Compression stress relaxation is used as a service life criterion, and the service life of the O-shaped rubber sealing ring under actual service conditions can be quickly predicted according to different temperatures and failure standards. The method overcomes the problems that a traditional service life prediction method is limited by mechanical property indexes and is insufficient in accuracy, efficient and accurate service life prediction oriented to engineering application is achieved, and the method is suitable for the fields such as nuclear power and the like which have extremely high requirements for sealing reliability.

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.

A chemically strengthened glass plate (1) is provided with a thin section (2), a thick section (3), and compressive stress layers (6a, 6b) formed on the respective surface sections of the thin section (2) and the thick section (3), and is bendable in the thin section (2). The chemically strengthened glass plate (1) has the relationship DOC2 > DOC1 and the relationship DOC2 / t2 > = 0.05, where DOC1 is the maximum compressive stress depth of the thin-walled section (2), DOC2 is the maximum compressive stress depth of the thick-walled section (3), and t2 is the thickness of the thick-walled section (3).

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.

The present application belongs to the technical field of structural strength analysis, and particularly relates to a strength analysis method for a variable gradient composite material wall panel, the strength analysis method comprising: solving the shear stress and compression stress of the variable gradient composite material wall panel based on the external load and structural parameters of the variable gradient composite material wall panel; calculating the allowable shear stress, allowable axial compression stress, and allowable bending stress based on the structural parameters; calculating the safety margin through the shear stress, the compression stress, the allowable shear stress, the allowable axial compression stress, and the allowable bending stress; the iterative safety margin is 0; and the stability strength design of the trapezoidal composite material wall panel with a variable gradient of the rudder surface can be performed, and finally the lightest wall panel structural parameters that meet the constraint conditions are obtained.

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.

Glass-based articles that include a reduced Young's modulus layer extending from a surface of the glass-based article to a depth of layer and an optional compressive stress layer extending from a surface of the glass-based article to a depth of compression are formed by exposing glass-based substrates to water vapor containing environments. The methods of forming the glass-based articles may include elevated pressures and / or multiple exposures to water vapor containing environments. The glass-based articles may be utilized in foldable or flexible electronic devices.

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 present invention relates to a method for producing metal matrix nanocomposite powders, comprising at least the following process steps: a) Providing a solid mixture containing metal particles and ceramic nanoparticles; b) Three-dimensional vibration of the solid mixture; c) Introducing a compressive stress into the particles of the solid mixture; and d) where appropriate, in particular rotating or linear movement of the solid mixture.

The utility model discloses an insulating sheath for a load switch, which belongs to the technical field of load switches and comprises an insulating sheath body, corrugated tongues are arranged on the insulating sheath body, protrusions of the corrugated tongues and recesses of the corrugated tongues on the inner surface of the insulating sheath body are alternately arranged, a waterproof layer is coated on the surface of the insulating sheath body, and the waterproof layer is coated on the outer surface of the insulating sheath body. The waterproof layer comprises a polyurethane waterproof coating, an acrylic acid waterproof coating and an acrylic acid waterproof coating. The inner wall of the insulating sheath body is filled with silicone rubber. According to the utility model, through the arrangement of the corrugated tongue, the insulating sheath body has good ductility, when the insulating sheath body needs to be bent, the corrugated tongue can absorb bending stress through self elastic deformation, stress and damage caused by bending are reduced, the insulating sheath body is prevented from being subjected to stretching and compression stress, and the service life of the insulating sheath body is prolonged. Therefore, the insulating sheath body is cracked or thinned, and the insulating property of the insulating sheath body is reduced.

In one or more embodiments, a chemically strengthened glass-based article includes a first major surface and an opposing second major surface defining a thickness t of the glass article; a stress profile [sigma] (x) extending through the thickness t of the glass article; a first compressive stress layer extending to a first depth DOC1 of greater than about 0.15 t; a second compressive stress layer extending from the second major surface to a second depth of compression DOC2 less than or equal to DOC1; and a central tension zone positioned between the first compressive stress layer and the second compressive stress layer and including a peak tension PT and a tension zone width BTZ spanning DOC1 to tDOC2. In an embodiment, the following criteria are satisfied: wherein DOC = DOC1 and is the slope of the stress profile sigma (x) at DOC; ; and wherein TA is the tension area, defined as follows.

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 toughened glass ceramic with a high strength and the use thereof. The toughened glass ceramic comprises a major crystal phase, i.e., a (Zn, Mg)Al2O4 crystal phase, and a secondary crystal phase, i.e., a tetragonal ZrO2 crystal phase. The toughened glass ceramic includes a compressive stress layer region extending from a surface of the toughened glass ceramic to a depth of compression, and there is a tensile stress layer region inside the toughened glass ceramic. The depth DOL_0 of a compressive stress layer of the toughened glass ceramic is greater than or equal to 0.21 t, wherein t is the thickness of the toughened glass ceramic; |CT_AV|≥70 MPa; and the toughened glass ceramic is endowed with a specific stress structure by satisfying the DOL_0 and |CT_AV|, and therefore the toughened glass ceramic has good drop impact resistance and a high mechanical strength.

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.

This invention discloses a fluid wall shear and compressive stress composite array sensor chip, belonging to the field of MEMS sensor technology. It includes several shear stress sensors and compressive stress sensors integrated on the chip. The shear stress sensors are arranged in a cross-shaped array, while the compressive stress sensors are arranged in a zigzag shape. These two arrays are concentrically superimposed to obtain a grid array layout. A pressure sensor is positioned at the center of the grid array. Several shear stress sensors are arranged radiating outwards along the cross-shaped direction with the central pressure sensor as the radiation center, used to measure two-dimensional shear stress. Several compressive stress sensors are arranged radiating outwards along the zigzag direction with the central pressure sensor as the radiation center, used to measure gradient pressure. This invention solves the problem that single-point measurements are insufficient to fully reflect the actual flow field stress distribution in complex fluid environments.

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 belongs to the technical field of glass manufacturing, and particularly relates to high-aluminum glass and a preparation method thereof. The high-temperature-resistant ceramic material is prepared from the following raw material components in percentage by mass: 60.0% to 70.0% of SiO2, 10.0% to 20.0% of Al2O3, 3.0% to 6.0% of Na2O, 2.0% to 5.0% of K2O, 0.0% to 4.0% of Li2O, 1.0% to 5.0% of CaO, 0.5% to 4.0% of MgO, 1.0% to 4.0% of ZrO2, 0.5% to 3.0% of TiO2, 1.0% to 3.0% of Y2O3 and 0.5% to 1.0% of B2O3. According to the high-alumina glass and the preparation method thereof, the dosage of each component of the high-alumina glass is adjusted, so that the high-alumina glass is excellent in mechanical property, the surface compression stress (CS value) is greater than or equal to 1000MPa, the stress layer depth (DOL) is greater than or equal to 100mu m, and meanwhile, the high-alumina glass has excellent properties of high hardness, high light transmittance, scratch resistance, drop resistance, high stability and the like.