190 results about "Tensile strain" patented technology

The invention discloses a preparation method of a composite phase-change temperature-adjusting organic fiber membrane with a flexible core-shell structure, and belongs to the field of intelligent textile materials.The preparation method comprises the following steps that polyacrylonitrile (PAN) serves as a sheath layer material, n-octadecane serves as a core layer phase-change material, and the composite phase-change fiber membrane is prepared through a melt spinning method and a coaxial electrostatic spinning technology. According to the invention, the fiber membrane with high melting enthalpy value (171.6 J / g), excellent thermal stability (the latent heat is still 117.7 J / g after 100 times of heating-cooling circulation) and excellent mechanical properties (the tensile strength is 2.418 MPa, the tensile yield stress is 2.331 MPa, the tensile strain at break is 36.5%, and the elastic modulus is 58.226 MPa) can be prepared; a new thought is provided for preparing intelligent textiles with good flexibility and efficient heat management capability.

The invention provides a hydraulic fracture evolution simulation method and device and electronic equipment.The hydraulic fracture evolution simulation method comprises the steps that a damaged rock mass is divided into a plurality of different calculation areas, and a seepage control equation of each calculation area is determined; in combination with seepage anisotropy, determining a seepage tensor of porous medium seepage-stress coupling in each calculation area; associating the seepage control equations of all the calculation areas with phase fields to obtain a target seepage control equation; and determining the displacement, fluid pressure and phase field of the damaged rock mass based on the target seepage control equation. Through the deduced seepage-stress coupling phase field model, the strain energy is decomposed through spectral decomposition, it is guaranteed that crack propagation occurs under the energy generated by tensile strain, and the problem that an existing hydraulic crack research method is limited is solved.

The invention relates to the technical field of tire processing, in particular to a pattern and rolling resistance simulation evaluation method and system for a rubber engineering tire. The method comprises the following steps: acquiring tire pattern parameters; building a finite element model of tire-road surface contact according to the tire pattern parameters; according to the finite element model, determining deformation distribution, longitudinal tensile strain, grounding pressure distribution and pavement contact rigidity of the tire in the rolling process; and determining a rolling resistance evaluation value according to the deformation distribution, the longitudinal tensile strain, the grounding pressure distribution and the pavement contact rigidity. And rapid parameterization iteration is supported, and modeling errors caused by non-uniform geometric feature description are avoided. And the simulation accuracy and repeatability are ensured. The influence of the pattern structure on the rolling process is reflected, and a foundation is laid for a rolling resistance evaluation value. Quantitative evaluation of the tire rolling resistance is realized, data-driven design optimization is supported, and the simulation efficiency is improved.

The invention discloses wear resistance detection equipment for carpet production and a detection method, and particularly relates to the field of carpet detection.The detection equipment comprises a machine body, a supporting seat is fixedly arranged in the machine body, the supporting seat is used for placing a carpet to be detected, and a fixing mechanism is further arranged in the machine body and used for fixing the carpet to be detected on the supporting seat; a grinding detection mechanism is arranged in the machine body, the grinding detection mechanism comprises a friction head capable of performing vertical linear motion and transverse reciprocating motion, and the grinding detection mechanism performs wear resistance detection by driving the friction head to perform transverse reciprocating motion on the upper surface of the carpet to be detected. The multi-point supporting assembly is arranged to disperse pressure, limit tensile strain, reduce vertical compression and provide additional support for the carpet to be detected, deformation of a surface layer material of the carpet to be detected when the surface layer material moves along with the friction head can be effectively reduced, and therefore the actual movement distance of the friction head can be closer to the theoretical movement distance; and the wear resistance detection precision is improved.

To provide a biaxially stretched film that has excellent folding resistance and heat resistance.SOLUTION: A biaxially stretched film contains a polyethylene naphthalate copolymer (A), wherein the average of hysteresis loss ratios after a tensile cycle test up to 5% tensile strain in the MD direction and in the TD direction is 47.0% or less.SELECTED DRAWING: None

The invention belongs to the field of mechanical property testing of metal materials, and relates to a method and a system for detecting tensile strain mark limit, the system applies tensile load to a metal plate sample through a test module, an illumination projection module projects a structured light pattern to the surface of the sample, and an image acquisition module continuously acquires surface images of the sample; and the data processing module is used for carrying out wrapped phase calculation, differential phase calculation, distortion parameter extraction and tensile strain mark initiation judgment on the image sequence, so that accurate positioning at the moment of tensile strain mark initiation and objective and quantitative measurement of the critical strain limit are realized. The method can effectively improve the detection sensitivity and accuracy of the material surface instability characteristics, realizes high-precision judgment at the moment of tensile strain mark initiation, and provides a reliable basis for material performance evaluation and quality control.

The invention discloses a nonvolatile memory device based on CrMoGe2S6 / Ga2O3 heterostructure tensile strain and a construction method, and belongs to the technical field of nonvolatile memory devices. Comprising the following steps: vertically stacking a single layer of Ga2O3 and a single layer of CrMoGe2S6, and constructing two kinds of CrMoGe2S6 / Ga2O3 heterostructures; performing biaxial tensile strain on the CrMoGe2S6 / Ga2O3 heterostructure, calculating a magnetic ground state and an energy band of the CrMoGe2S6 / Ga2O3 heterostructure under different strains, and screening out the CrMoGe2S6 / Ga2O3 heterostructure which is represented as a ferromagnetic state; and on the basis of the screened CrMoGe2S6 / Ga2O3 heterostructures, two CrMoGe2S6 / Ga2O3 heterostructures with the same tensile strain are selected to construct the nonvolatile memory device. Ferroelectric Ga2O3 is introduced to serve as a switch, the electronic property of CrMoGe2S6 is controlled by the polarization state of Ga2O3, the Ga2O3 which is electrically polarized upward P does not change the semiconductor characteristic of CrMoGe2S6, and the Ga2O3 which is electrically polarized downward P enables the CrMoGe2S6 to present semimetallic property; therefore, the non-volatile electric control of the CrMoGe2S6 between the antiferromagnetic semiconductor and the semimetal is indirectly realized; the characteristic is especially important for a memory device, and can significantly reduce energy consumption and improve data stability.

The invention relates to hydrogel with high tensile strain as well as a preparation method and application thereof. The hydrogel with high tensile strain is prepared from the following raw materials: N-methylacryloyl chitosan and acrylamide. The hydrogel disclosed by the invention has high tensile strain and cycling stability and high sensitivity, is an ideal multi-mode flexible sensing material, and can be applied to the fields of biomedicine and flexible sensing.

The invention provides a functional alloy capable of obtaining permanent magnet performance (stretching induced magnetic effect) through stretching and a preparation method of the functional alloy. The expression of the functional alloy is FeaNibCocAld, a, b, c and d respectively represent the atomic percentage (at.%) of corresponding elements, a = 40-50, b = 25-35, c = 10-20, d = 5-15, and a + b + c + d = 100. The preparation method of the functional alloy comprises the steps of smelting, rolling and heat treatment. The BCC magnetic particles are precipitated and separated out through rolling and heat treatment processes, so that the BCC magnetic particles have the special performance of generating magnetic force under the action of tensile strain. And the number of BCC magnetic particle precipitates can be controlled by adjusting the heat treatment temperature, so that the magnetic field intensity of the alloy after breaking is regulated and controlled. The maximum magnetic induction intensity of the functional alloy after tensile fracture is increased to 122 Gs from 2Gs of an original alloy through rolling and heat treatment processes, and the maximum magnetic induction intensity of the functional alloy after tensile fracture can be regulated and controlled within a certain range by adjusting the heat treatment temperature. The effect of obtaining the permanent magnet performance through stretching is found for the first time, a method for regulating and controlling the magnetic induction intensity is found, stress changes and magnetic signal changes can correspond to each other through the phenomenon, and therefore the method is expected to be applied to some specific equipment.

The invention discloses a conjugated polymer film with electrical properties and tensile stability simultaneously improved, and a preparation method and application thereof, and belongs to the technical field of flexible electronic materials. The preparation method comprises the following steps: placing the conjugated polymer film in a solution formed by mixing an electrolyte and a dopant, and soaking for 30-60 seconds to complete ion exchange doping, thereby obtaining the conjugated polymer film with various carrier transport channels. The strategy of increasing the types of carrier transmission channels is adopted, and two main transmission channels of a crystal phase and an accumulation region are formed in the conjugated polymer film through an ion exchange doping method, so that the conjugated polymer film can maintain the electrical property at a high proportion under a stretching external field, and the electrical property of the conjugated polymer film is improved under the same stretching strain. And the tensile stability of the conductivity is far higher than that of a conjugated polymer film which only takes a crystal phase or an accumulation region as a carrier transmission channel.

A device and method of forming a device are provided. The method includes forming a stack of nanostructure channels over a substrate by forming a source / drain opening. The method also includes forming a sacrificial source / drain in the source / drain opening. The method further includes increasing tensile strain of the stack of nanostructure channels by replacing the sacrificial source / drain with a replacement source / drain having germanium concentration that exceeds that of the sacrificial source / drain.

The invention provides a device and a method for testing tensile strain in an extremely low temperature environment, the device comprises a stretching mechanism, a stretching assembly and an adapter member, the stretching assembly comprises a first stretching piece and a second stretching piece, a sample piece to be tested penetrates through the first stretching piece and the second stretching piece and is detachably connected with the adapter member, and the first stretching piece and the second stretching piece are connected with the adapter member. Each of the first extension piece and the second extension piece comprises a first extension part and a second extension part, the first extension parts and the second extension parts are oppositely arranged, and two ends of the extension assembly are respectively provided with an extensometer. According to the device for tensile strain testing in the extremely low temperature environment, a rod-shaped or plate-shaped sample piece to be tested can be subjected to a tensile test, and the stretching assembly can enable the stretching sliding to be smooth in the extremely low temperature environment, so that the obtained tensile data is stable and reliable; by arranging the switching component, the tensile test is ensured to be smoothly carried out; through double-extension measurement, mean value correction can be realized, complex working conditions can be adapted, and the credibility of data can be improved.

Provided is a steel sheet having a chemical composition comprising C: 0.020 to 0.100%, Mn: 1.00 to 2.50%, P: 0.100% or less, S: 0.0200% or less, Al: 0.005 to 0.700%, N: 0.0150% or less, O: 0.0100% or less, etc., and a balance of Fe and impurities, and a microstructure comprising, by area %, ferrite: 70 to 97% and a hard phase: 3 to 30%, wherein an Str of the surface is 0.35 to 0.75, and a difference ΔStr of the Str and the Str after imparting 5% tensile strain is 0.15 or less.

A fluid-gated strain sensor based on microchannel non-uniform strain distribution comprises a microchannel as a stretching carrier and a functional material liquid conductor filled in the microchannel, wherein a discrete microcolumn array is distributed in the microchannel, and the gaps between the discrete microcolumn array form an intelligent gating driven by strain; the discrete microcolumn array will produce non-uniform strains that are unequal up and down under strain drive, wherein the connection with the microchannel substrate has the same strain as the microchannel, and the strain transmission is increasingly attenuated toward the middle, thereby causing adjacent microcolumns to approach or even contact each other, thereby achieving gate closure; the closed gating causes the cross-section of the conductive path constructed by the functional material liquid conductor to approach zero at the gate, thereby causing the resistance at both ends of the microchannel filled with the functional material liquid conductor to show an order of magnitude change, thereby converting the strain signal into an electrical signal, thereby achieving high-sensitivity, large-stretchability strain sensing; the present invention has the advantages of both a high gauge factor and a large stretch range.

The invention relates to an engine component fatigue life evaluation method based on a structural simulation part, and belongs to the technical field of simulation data processing, and the method comprises the following steps: building a tensile strain energy life prediction model based on elastic strain energy and plastic strain energy, and predicting the fatigue life of a structural part based on the model; optimizing the design parameters of the simulation part of the engine component, manufacturing the simulation part based on the design parameters, performing a low-cycle fatigue test on the simulation part, and analyzing the fatigue life of the simulation part; comparing the fatigue life of the simulation part with the predicted fatigue life of the structural part, and if the requirements are not met, re-optimizing the design parameters of the simulation part; and if the requirement is met, outputting the fatigue life of the structural member. According to the method, the fatigue life of the simulation part is compared with the predicted fatigue life of the structural part, the model is further improved, a closed-loop research method is formed, the accuracy and efficiency of fatigue life prediction are improved, the limitation of a traditional hysteresis energy method is overcome, and the research cost and period are reduced.

A pressure sensor includes a first wafer having a first deflectable diaphragm and a second deflectable diaphragm. The first deflectable diaphragm has a first relationship between deflection and applied pressure, and the second deflectable diaphragm has a second relationship between deflection and applied pressure. The first relationship and the second relationship are different from each other. The second wafer is attached to the first wafer. At least one tensile strain gauge is coupled to the first deflectable diaphragm and at least one compressive strain gauge is coupled to the second deflectable diaphragm. An overvoltage feature is mounted relative to one of the first wafer and the second wafer. The overpressure feature is configured to contact the other of the first wafer and the second wafer during an overpressure condition exceeding a maximum measured pressure of the first deflectable diaphragm and a maximum measured pressure of the second deflectable diaphragm.

A pressure sensor includes a first wafer having a primary deflectable diaphragm and a secondary deflectable diaphragm. The primary deflectable diaphragm has a first relationship between applied pressure and deflection, and the second deflectable diaphragm has a second relationship between applied pressure and deflection. The first and second relationships differ from one another. A second wafer is attached to the first wafer. At least one tensile strain gauge is coupled to the primary deflectable diaphragm and at least one compressive strain gauge coupled to the secondary deflectable diaphragm. An overpressure feature is mounted relative to one of the first wafer and the second wafer. The overpressure feature is configured to contact the other of the first wafer and second wafer during an overpressure condition that exceeds a maximum measurement pressure of the primary deflectable diaphragm and a maximum measurement pressure of the secondary deflectable diaphragm.

According to the tensile strain testing device for the small sample material, a displacement load is applied to a stress conduction guide rod, and the load is transmitted to an elastic piece through the stress conduction guide rod and a mechanical sensor, then transmitted to a square guide rod through the elastic piece and finally transmitted to an upper clamp and a sample through the square guide rod; and the double-frequency laser interferometer is used for measuring the displacement of the square guide rod, namely the stretching displacement of the sample. The measuring device provided by the utility model can be suitable for the sample size as small as millimeter magnitude, the measuring precision can reach nanometer magnitude, and the measuring device is simple and convenient to operate and has remarkable practical value.

This invention discloses a high-performance wood-plastic composite frame structure for building doors and windows, belonging to the field of building materials technology. The frame structure includes a wood-plastic outer wall and an internal cavity. A continuous support mesh structure composed of an array of topological units is integrally formed within the cavity. The topological units are configured with a tensile geometry exhibiting a negative Poisson's ratio effect, including multiple load-bearing members and connecting nodes. When the wood-plastic outer wall experiences axial expansion tensile strain due to heat, the topological units compensate for this displacement through node rotation and member bending, thereby significantly reducing interfacial shear stress and suppressing the arching deformation of the frame. When external fasteners are subjected to axial pull-out force, the topological units undergo centripetal contraction deformation, enhancing the frictional gripping force on the fasteners. This invention resolves thermal stress through microscopic geometric reconstruction, effectively addressing the shortcomings of poor thermal stability and insufficient nail-holding power in wood-plastic profiles.

This invention discloses a method and equipment for evaluating the tensile toughness of recycled asphalt mixtures, relating to the field of analytical techniques for recycled asphalt mixtures. The method includes: acquiring variables related to the internal structure and external environment of the recycled asphalt mixture to be evaluated; the variables related to the internal structure include: internal structural state variables, the length of the aggregate-binder two-phase interface transition zone, and the elastic modulus; the variables related to the external environment include: tensile strain ratio, loading frequency, and dynamic modulus; and calculating the tensile toughness evaluation value of the cold recycled asphalt mixture based on a predetermined multi-parameter coupling relationship using the variables related to the internal structure and the external environment. This invention introduces environmental factors and internal structural parameters of the recycled asphalt mixture to establish a multi-parameter tensile toughness evaluation model, fully considering the material composition, microstructural distribution characteristics, load factors, and ambient temperature of the recycled asphalt mixture under stress in the structural layer, enabling accurate evaluation of the tensile toughness of the recycled asphalt mixture.

The application discloses a preparation method of a silica gel-based rigid-flexible coupling pneumatic soft body finger, which comprises the following steps: firstly, preparing a silica gel gas distribution base layer and a silica gel pneumatic expansion joint structure; then, bonding the silica gel gas distribution base layer, the silica gel pneumatic expansion joint structure and a rigid framework into a semi-finished product pneumatic soft body finger; placing the semi-finished product pneumatic soft body finger into a pneumatic soft body finger mold, and placing a flexible tensile strain sensor on the palm of the semi-finished product pneumatic soft body finger, and placing the electric signal lead wire of the flexible tensile strain sensor outside the pneumatic soft body finger mold; finally, injecting silica gel into the pneumatic soft body finger mold to coat the semi-finished product pneumatic soft body finger and the flexible tensile strain sensor into an integral whole by using the silica gel.

The application provides a driving rope and mechanical hand system with force sensing capability, and belongs to the technical field of bionic mechanical hands. The system is composed of a tensile strain sensor and a driving rope. The tensile strain sensor is arranged on the surface of the driving rope and is bonded with the front section by using a flexible adhesive to be arranged in a mechanical hand. The tensile strain sensor and the driving rope are separated at the rear section. The separated driving rope is used for connecting a motor, and the tensile strain sensor is used for connecting a control system. In this way, the tensile strain of the driving rope can be measured in real time while power is transmitted, and the gripping force of a mechanical finger is obtained, so that the "sensing and driving integration" mode of a bionic tendon is realized.

The present invention provides a medical molded article including a bioabsorbable polyester and having excellent followability to a living body, and the present invention is a medical molded article including a bioabsorbable polyester, the medical molded article having an amount-of-work-holding rate of 55% or more, the amount-of-work-holding rate defined as a rate of an amount of work generated finally by an operation that is repeated 10 times to an amount of work generated first by the operation, the operation in which a tensile stress is applied to the medical molded article in a direction of a maximum length of the medical molded article to generate a tensile strain of 100% with respect to an initial length.

The application relates to the field of household decorative plate industrial production, in particular to a composite method, device, system, equipment and medium for an asymmetric aluminum sandwich plate, which comprises the following steps: determining a loading proportionality coefficient between a first aluminum roll and a second aluminum roll according to a first thickness corresponding to the first aluminum roll and a second thickness corresponding to the second aluminum roll; the loading proportionality coefficient is used for representing a ratio relationship of the required tensile force of the first aluminum roll and the second aluminum roll under the condition of applying the same transverse displacement; calculating a target tensile force corresponding to the other aluminum roll according to a first preset tensile force corresponding to any aluminum roll and the loading proportionality coefficient, and then compositing the two first aluminum rolls and the second aluminum roll according to the corresponding tensile forces to obtain the asymmetric aluminum sandwich plate. According to the application, the tensile forces of the two aluminum rolls with different thicknesses can be determined before the composition, so that the two aluminum rolls have the same tensile strain, and the symmetric aluminum sandwich plate without the stress warping problem can be obtained through the composition.

To provide a technique for suppressing curling by molding of an exterior material for a power storage device.SOLUTION: An exterior material for a power storage device is composed of a laminate having at least a base material layer, a barrier layer and a heat-fusible resin layer in this order, wherein the laminate has a gradient of a stress-strain curve between two strain points at a tensile strain of 1% and a tensile strain of 5% in an MD direction of 700 MPa or less.

The invention discloses a negative Poisson's ratio effect energy harvesting device and method suitable for a road structure, and belongs to the technical field of road vibration energy harvesting. The device comprises a substrate with a negative Poisson's ratio structure, piezoelectric ceramic covering and fixed on the substrate, and an excitation rod arranged on the surface of the piezoelectric ceramic. The negative Poisson's ratio structure is formed by periodically arranging a plurality of inwards-concave annular unit cells, and when the negative Poisson's ratio structure is subjected to the action of pressure stress such as traffic load, unique two-way expansion deformation can be generated, so that vertical pressure is efficiently converted into two-way tensile strain in a plane, and the two-way tensile strain is transmitted to piezoelectric ceramics. According to the structure, a traditional d31 working mode is reserved, a d32 mode is more effectively excited, the charge migration path is remarkably widened, and the electro-mechanical conversion efficiency is improved. The device is especially suitable for a low-frequency traffic load environment, solves the problem of low energy collection efficiency caused by resonant frequency mismatch of a traditional cantilever beam structure, and provides an efficient and reliable solution for self-power supply of road infrastructures.

The invention discloses a three-dimensional cell culture device capable of quantitatively applying mechanical tensile stress, which comprises a cell culture device main body, the cell culture device main body comprises a culture dish, a fixed frame and a movable frame, the movable frame is arranged on the fixed frame, the fixed frame is provided with a fixed clamp, the movable frame is provided with a movable clamp, and the movable clamp is fixed on the culture dish. A culture dish is placed on a fixing frame, cells based on collagen hydrogel embedding are cultured in the culture dish, hydrogel is fixed through a fixed clamp and a movable clamp, then a movable frame moves, and the movable clamp drives the collagen hydrogel to be away from the fixed clamp. Accurate tensile stress can be applied on the basis of cells embedded by the collagen hydrogel, the stability of the force is ensured, the strain is flexibly applied as required, the controllable range and the accuracy are greatly improved, and the maximum tensile strain can reach 200%. Quantitative drawing force can be applied to cells, operation is easy, and a culture medium is more convenient to replace.

The invention discloses a geopolymer with high tensile strength and a preparation method thereof, and relates to the technical field of building materials. The raw materials of the geopolymer comprise the following components: water, sodium hydroxide, water glass, slag, fly ash, SAP (super absorbent polymer) and bio-based carbon fiber, the mass part ratio of the water to the sodium hydroxide to the water glass to the slag to the fly ash is 100: (15-16): 61: (217-218): 145, the SAP accounts for 0.15%-0.4% of the total mass of the raw materials, and the bio-based carbon fiber accounts for 0.13%-0.43% of the total mass of the raw materials. The tensile strength of the geopolymer is improved, the problem of low tensile strength of the geopolymer is solved, and the tensile strain performance of the geopolymer is greatly improved.

The invention discloses a steel-UHPC (Ultra High Performance Concrete) composite beam and a design system for fine deflection control of the steel-UHPC composite beam. The system comprises a set of complete design method and a composite beam structure optimized for realizing the method. The core of the design system is to provide a dual design methodology: 1, the method is a high-fidelity refined design method based on a UHPC nonlinear stretching constitutive relation; according to the method, the residual tension contribution in the tension area is accurately quantified, and the problem of underestimated rigidity caused by neglecting the contribution in the traditional theory is solved. And secondly, the method is a simplified design method which is based on a traditional conversion section method and is calibrated. According to the simplification method, a creative convenient design tool capable of quickly determining the initial size of the structure is provided for engineers. According to the method, the structural performance is remarkably improved, on the premise that the standard deflection requirement is met, the beam body height can be greatly reduced, the structural dead weight is reduced, and the economic and technical advantages which cannot be achieved through a traditional method are obtained.

The invention relates to a bending test method for an asphalt mixture composite board. The bending test method comprises the following steps: preparing an asphalt mixture composite board test piece; carrying out heat preservation on the asphalt mixture composite board test piece; placing the asphalt mixture composite board test piece subjected to heat preservation on a clamp, vertically and downwards loading the asphalt mixture composite board test piece at a constant speed, and collecting pressure load and midspan displacement when the test piece is damaged; and calculating the flexural tensile strength, the maximum flexural tensile strain and the bending stiffness modulus. The invention provides a special low-temperature crack resistance test method for a multi-layer asphalt mixture structure.