229 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 discloses a collapsible loess foundation deformation analysis system and method based on variable monitoring, and relates to the technical field of collapsible loess foundation deformation analys.The collapsible loess foundation deformation analysis method comprises the steps that a structural attenuation model is established, and the structural attenuation model establishes the relation between a structure degree index and compression structure yield stress; calculating a self-weight collapsibility coefficient of the loess under the saturated self-weight action by utilizing a compression curve and a structural attenuation model; monitoring a deformation correlation variable of the collapsible loess area in the foundation; and evaluating the self-weight collapsing deformation of the collapsible loess area in the foundation based on the deformation correlation variable and the self-weight collapsing coefficient. According to the method, the structure degree indexes are used for quantitatively describing the structure of the loess, and the indexes comprise the material composition of the loess and the structure characteristics of the loess of different deposition years. The relation between the yield stress of the structure and collapsing deformation is established, wherein the relation between the yield stress of the compression structure of the loess and the structure degree of the compression structure of the loess and the relation between the void ratio change and the compression stress in the loess compression deformation process are established.

The invention discloses an extraction amount increasing overflow forming annealing device 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 blue, geometric structure parameters, specific parameters and common parameters of the glass substrate overflow forming annealing device are obtained to serve as design references, and the length similarity relation of a thickness forming area and the similarity relation between the lengths of a pre-annealing area, a soaking area, an annealing area and a subsequent annealing area and heater power are established; and according to the established similarity relationship, obtaining the length parameter of the extraction amount lifting overflow forming annealing device, and completing the design of the glass substrate overflow forming annealing device. By adopting the design method, the problem that the cooling distance designed in the traditional theory is long is solved, more accurate, efficient and low-cost design of the overflow forming annealing device 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.

The invention discloses a variable stiffness pipe and a continuum robot variable stiffness module, and relates to the technical field of continuum robotics.The variable stiffness pipe comprises a flexible inner pipe and a flexible outer pipe arranged outside the flexible inner pipe in a sleeving mode, and a phase change material and a flexible heat exchange device are arranged between the flexible inner pipe and the flexible outer pipe; the heat exchange device can exchange heat with the phase-change material and enable the phase-change material to be changed from a solid phase to a liquid phase, a flexible pipe is further arranged in the filling space, a plurality of hollow groove sets are formed in the pipe wall of the flexible pipe in a penetrating mode, the hollow grooves are filled with the phase-change material, the flexible pipe can be freely bent when the phase-change material is in the liquid phase, and the flexible pipe can be bent when the phase-change material is in the solid phase. According to the variable-stiffness continuum robot, the shear modulus resisting shear deformation under the shear stress is converted into the compression modulus resisting compression deformation under the compression stress, the stiffness of the variable-stiffness pipe can be improved, the variable-stiffness continuum robot comprises the variable-stiffness pipe and a control mechanism, and the variable-stiffness continuum robot can be controlled by controlling the stiffness of the variable-stiffness pipe to change. And the motion control module is matched to move towards the target position and control the surgical tool.

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.

A compressed air energy storage underground chamber inner arch type cylindrical shell composite lining structure relates to the technical field of new energy engineering structures, and structurally comprises a surrounding rock, a steel-concrete outer layer lining, a cylindrical shell support extrusion connecting device, an inner arch type cylindrical shell support and an inner arch type cylindrical shell from outside to inside; a plurality of inner arch type cylindrical shell sections are connected to form an inner arch type cylindrical shell longitudinal joint, and a plurality of inner arch type cylindrical shells are sequentially connected to form a closed gas storage space. The method has the beneficial effects that a plurality of inner arch type cylindrical shells with proper spans are arranged on the inner wall of the outer layer lining, so that a high-internal-pressure gas storage load is converted into axial pressure of the inner arch type cylindrical shells, compression stress between arch type cylindrical shell supports, distribution pressure of the outer layer lining and radial pressure of far-end surrounding rock; on the premise that the space utilization rate of the gas storage chamber is not obviously weakened, circumferential deformation, circumferential stress and axial temperature stress of the outer lining and the near-end surrounding rock are reduced, and the safety of the gas storage structure and the stability of the surrounding rock are improved.

The invention discloses an integrated thickness section gradient performance control steel member and a manufacturing method and application thereof, and belongs to the technical field of automobile and mechanical part manufacturing. The technical problems that in the prior art, when the gradient performance control steel component is prepared, hot pressing forming or welding or laser sintering or other modes are needed, the manufacturing process is complex, consumed time is long, and cost is high are solved. The method realizes performance gradient control of the same steel plate, and can be used for manufacturing parts requiring performance gradient such as an automobile anti-collision beam. The manufacturing method comprises the steps that 1, a steel plate is cut according to the unfolding size of a part; 2, the steel plate is subjected to cold machining to form a cambered surface in a bending deformation or roll bending deformation mode, and a tension stress mode and a compression stress mode are generated respectively; and 3, the steel plate is finely machined according to the part size requirement, and part manufacturing is completed. By means of the method, the steel part with the integrated thickness section gradient performance control function can be prepared, and complex processes such as steel plate hot stamping forming, welding and laser sintering are not needed.

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.

The invention provides a method for constructing a constitutive model of compression creep of a metal material. The method comprises the following steps: 1) constructing the constitutive model of the metal material under nominal compression stress; 2) determining a creep time threshold value of the metal material; 3) determining creep characteristic constants A and B and creep time influence parameters n and m of the material; and 4) substituting the determined material parameters A, n, m and B into the constitutive model under the nominal compression stress to obtain the compression creep constitutive model of the metal material. According to the method, the change relation of the creep strain of the metal material under the constant compression load along with time can be described, and the creep deformation behavior of the metal material under the long-term compression load can also be predicted, so that the design of a structural member is optimized, and the service reliability of the structural member is improved.

A method for determining a compressive strength of compression-cast rubber fine aggregate concrete is provided. The method includes: first strength information of normal cast concrete, second strength information of corresponding normal cast rubber fine aggregate concrete, and third strength information of compression-cast rubber fine aggregate concrete; a target equation between a compressive strength of the normal cast concrete, a compressive strength of the compression-cast rubber fine aggregate concrete, the rubber substitution rate and a compression stress is constructed according to the first strength information, the second strength information and the third strength information; target parameters of the compression-cast rubber fine aggregate concrete are acquired, and the target parameters are inputted into the target equation which outputs a current compressive strength of the compression-cast rubber fine aggregate concrete. The compressive strength of the compression-cast rubber fine aggregate concrete can be accurately determined.

A plate-like chemically strengthened glass having a compression stress layer on the surface of the glass, wherein the compressive stress value (CS0) at the glass surface of is 500 MPa or more, the plate thickness (t) is 400 μm or more, the compressive stress depth of layer (DOL) is (t×0.15) μm or more, the compressive stress values (CS1) and (CS2) when the depth from the glass surface is ¼ and ½, respectively, are 50 MPa or more, m1 expressed by {m1=(CS1−CS2 / (DOL / 4−DOL / 2)} is −1.5 MPa / μm or more, m2 expressed by {m2=(CS2 / (DOL / 2−DOL)} is 0 MPa / μm or less, and m2 is less than m1.

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.

A chemically strengthened glass sheet in which a value of SB / (SA×t) is 5.0 mm−1 or more, where SA (MPa·μm) is an integrated value of a 5 compressive stress from a surface of the glass sheet to a depth of 10 μm, SB (MPa·μm) is an integrated value of a compressive stress from the depth of 10 μm to DOL which is a depth at which the compressive stress is zero, and t (mm) is a thickness of the glass sheet.

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.

A tempered glass has a surface and a thickness. When a compressive stress of the tempered glass is represented by a positive number and a tensile stress thereof is represented by a negative number, the compressive stress at the surface is 400 MPa or more, a stress profile of the tempered glass obtained by measuring a stress in a depth direction from the surface has inflection points at each of which a second derivative of the stress profile becomes zero between the surface and a depth equal to half of the thickness, and the compressive stress value at a first inflection point at a position closest to the surface among the inflection points is 150 MPa or less. The compressive stress at a second inflection point at a position deeper than the first inflection point is 45 MPa or less.

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.

A cover glass is provided that includes a silica based glass ceramic with a thickness between 0.4 mm and 0.85 mm. The glass ceramic has a transmittance of more than 80% from 380 nm to 780 nm and a stress attribute selected from: an overall compressive stress (CS) of at least 250 MPa and at most 1500 MPa, a compressive stress at a depth of 30 μm (CS30) from one of the two faces of at least 160 MPa and at most 525 MPa, a depth of the compression layer (DoCL) of at least 0.2 times the thickness and less than 0.5 times the thickness, and any combinations thereof. The glass ceramic has at least one silica based crystal phase having in a near-surface layer a unit cell volume of at least 1% by volume larger than that of a core where the crystal phase has minimum stresses.

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.

Glass-based articles comprise: a lithium-based aluminosilicate composition; a glass-based substrate having opposing first and second surfaces defining a substrate thickness (t), wherein t is less than or equal to 0.74 mm; and a stress profile comprising: a spike region extending from the first surface to a tail region. A stress profile comprises: a maximum compressive stress (CSmax) of greater than or equal to 450 MPa; a spike region extending from the first surface to a tail region; and the tail region extending to a center of the glass-based article; wherein the tail region comprises: a region of enhanced stress having a first average compressive stress (CSavg−1) of greater than or equal to 100 MPa; and a FSM depth of layer (DOLFSM) located at a depth of greater than or equal to 13 micrometers.

A glass ceramic article having: one or more crystalline phases; remaining a glass phase; a compressive stress layer extending from the first surface to a depth of compression (DOC); a maximum center tension greater than 70 MPa; a storage tensile energy greater than 22 J / m2; a fragmentation toughness greater than 1.0 MPa square root of m; and a haze of less than 0.2.

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.