141 results about "Tensile strain" patented technology

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 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 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.

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.

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 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.

A pressure sensor (200) includes a first wafer (202) having a primary deflectable diaphragm (208) and a secondary deflectable diaphragm (210). The primary deflectable diaphragm (208) has a first relationship between applied pressure and deflection, and the second deflectable diaphragm (210) has a second relationship between applied pressure and deflection. The first and second relationships differ from one another. A second wafer (204) is attached to the first wafer (202). At least one tensile strain gauge (214, 216) is coupled to the primary deflectable diaphragm (208) and at least one compressive strain gauge (218, 220) is coupled to the secondary deflectable diaphragm (210). An overpressure feature (222) is mounted relative to one of the first wafer (202) and the second wafer (204). The overpressure feature (222) is configured to contact the other of the first wafer (202) and second wafer (204) during an overpressure condition that exceeds a maximum measurement pressure of the primary deflectable diaphragm (208) and a maximum measurement pressure of the secondary deflectable diaphragm (210).

This invention discloses a method for controlling welding hot cracks with bilateral symmetrical thermal strain assistance. The method includes preparation before welding and welding. In the welding step, the temperature generated by the two induction coils is stabilized at 302±5℃ before welding begins. During welding, the welding heat source and the two induction coils move synchronously and uniformly from back to front, so that the thermal strain generated by the two induction coils continuously heats the workpieces to be welded on both sides of the weld within the brittle temperature range behind the molten pool until welding is completed. In this way, the thermal strain generated by the two induction coils continuously heats the corresponding workpieces to be welded on both sides of the weld within the brittle temperature range behind the molten pool. The thermal expansion of the workpieces generates a transverse compressive strain pointing towards the weld center in the weld metal within the brittle temperature range (BTR zone) behind the molten pool, thus counteracting the crack-inducing tensile strain generated in the brittle temperature range during welding, thereby effectively controlling the generation of hot cracks.

Provided is a grain-oriented magnetic steel sheet having both low iron loss and low magnetostriction. The grain-oriented magnetic steel sheet has a heat-strained region extending in a direction transverse to a rolling direction, and has closed magnetic domains in the heat-strained region. The heat-strained region has maximum points of tensile strain on both sides of the closed magnetic domains in the rolling direction. In a strain distribution in the rolling direction of the heat-strained region, the strain on both sides of the closed magnetic domains is a tensile strain greater than the strain at the center between the maximum points.

The utility model relates to a clamping test fixture assembly applied to a limit flexural-tensile strain test, and relates to the field of concrete performance detection.The clamping test fixture assembly comprises a clamping bottom frame and a test pressure head, the clamping bottom frame comprises a mounting base and two supporting pieces, and an adjusting sliding groove is formed in the top face of the mounting base in the length direction; adjusting sliding blocks in one-to-one correspondence with the supporting pieces are installed in the adjusting sliding grooves in a sliding mode, adjusting inserting blocks are arranged at the tops of the adjusting sliding blocks, and adjusting inserting grooves allowing the adjusting inserting blocks to be inserted therein are formed in the bottoms of the supporting pieces. The mounting base is further provided with an adjusting mechanism for adjusting the distance between the two adjusting sliding blocks. The supporting device has the effect that the position of the supporting piece on the supporting bottom plate can be conveniently adjusted.

This method for producing a crystalline resin sheet includes press-rolling a sheet-shaped molten crystalline resin composition between a pair of pinch rolls. The crystalline resin composition includes a crystalline resin and a soluble nucleating agent. When the radius of the pair of pinch rolls is denoted by R, the average thickness of the sheet after press-rolling is denoted by L, and the sheet take-up speed in the pair of pinch rolls is denoted by V, an adjustment is performed so as to control the average elongational strain rate ε (R, L, V) in the sheet elongation direction represented by a specific formula to be more than 30 s−1 but no more than 80 s−1.

The steel sheet has a TS of 1180 MPa or more and less than 1470 MPa, and has high YS, excellent ductility, excellent press formability of the inside and the ends of the steel sheet, and high crack propagation resistance. A base steel sheet has a predetermined component composition, the Vickers hardness of the base steel sheet is 84% or less with respect to a position 1 / 4 of the sheet thickness from the surface of the base steel sheet, the base steel sheet has a surface soft layer satisfying the following formula (1), the structure in the surface soft layer is within a specific range, and the structure in the position 1 / 4 of the sheet thickness of the base steel sheet is within a specific range. In a 90-degree V bending test having a bending radius of 0.5 mm, the length of a crack progressing in the ridge direction from the end of a bent ridge is 200 [mu] m or less, the El when subjected to a notch tensile test after being subjected to a heat treatment at 170 DEG C for 20 minutes is 6.0% or more, and the El when subjected to a notch tensile test after being subjected to a heat treatment at 170 DEG C for 20 minutes by introducing a 2% tensile nominal strain and then being subjected to a heat treatment at 170 DEG C is 5.0% or more. (1) 20 < = X < = 120-3800 * [Sb]-1900 * [Sn].

The present invention discloses a life prediction method based on the total tensile strain energy density taking into account the stress relaxation effect. First, at the same temperature, the test is carried out in a strain control mode to obtain the mechanical response parameters and test life of each material test in the half-life cycle. Then, based on the mechanical response in the load-holding stage, a stress relaxation model is fitted and the area under each region of the half-life cycle hysteresis loop is used as the damage parameter to represent the inelastic strain energy density caused by various loads. At the same time, the material's compensation effect is considered and the influence of the average stress on the life is corrected. Finally, based on the strain energy density-frequency separation method, a life prediction model is established to achieve fatigue-creep life prediction. The model of the method of the present invention can comprehensively consider the influence of multiple important factors such as stress relaxation, loading waveform, loading frequency, and average stress on the life, and uses the area of ​​the hysteresis loop as the damage parameter, so that the model has certain physical significance and has strong versatility in practical engineering applications.

The application provides a helicopter landing gear landing load measurement method, the method comprises the following steps: pasting at least 10 strain gauges at the wheel shaft position; obtaining the tensile strain, shear strain, bending strain and torsional strain of the strain gauges; determining the heading load, lateral load and / or vertical load when the helicopter landing gear lands based on the tensile strain, shear strain, bending strain and torsional strain of the strain gauges; the application realizes the analysis and calculation of the transmission of the three-directional ground loads to the landing gear wheel shaft during the landing of the helicopter, the reverse derivation process of strain to load is supplemented by the forward derivation of traditional load to strain, the interference of the nonlinear superposition of combined loads on the solution of ground load calculation is eliminated, the position requirement that the strain gauge layout needs to meet the unidirectional load sensitivity is reduced, and good universality is achieved.

The invention relates to the field of road engineering, in particular to an in-service asphalt pavement thin overlay residual bearing capacity evaluation method and system based on a conversion coefficient and a storage medium, and the method comprises the steps: obtaining the accumulated axle load action frequency at the traffic lane wheel track of an asphalt pavement; the modulus of each structural layer of the asphalt pavement is obtained through FWD inversion; according to the modulus of each structural layer, constructing a mechanical analysis model through a finite element method to obtain the maximum tensile strain of the overlay; acquiring the maximum stress of the finishing coat according to the maximum tensile strain of the finishing coat; performing an indoor splitting fatigue test by adopting the coring test piece to obtain a fatigue life prediction equation of the overlay; obtaining a conversion coefficient according to the overlay fatigue life prediction equation; and obtaining the residual bearing capacity of the thin overlay according to the maximum stress of the overlay and the conversion coefficient. According to the embodiment of the invention, scientific evaluation and accurate prediction of the residual bearing capacity of the thin overlay of the in-service asphalt pavement are realized through a method of fusing the field measured data and the conversion coefficient of the indoor model.

The invention provides a ceramic material interface failure simulation method and system based on molecular dynamics simulation, and belongs to the technical field of material science and engineering. Comprising the following steps: constructing an atomic-scale interface model between two ceramic phases and setting molecular dynamics simulation parameters based on an intrinsic crystal structure of a ceramic material; performing tensile strain simulation on the composite material composed of the two ceramic phases based on the atomic-scale interface model, and loading an external acting force and a temperature gradient in the tensile strain simulation process; and tracking the interface evolution process of the atomic-scale interface model in real time so as to determine the interface failure mechanism of the ceramic material. According to the invention, through interface failure simulation with high precision, strong adaptability and good physical basis, the whole process from crack initiation to expansion of the ceramic interface can be reproduced more truly.

The application discloses a kind of based on boronene and its strain regulation and control broadband terahertz wave absorber and its design method, the designed wave absorber includes metal bottom plate and dielectric substrate silicon, sheet boronene is arranged on the surface of silicon lining, and thin dielectric layer silicon is arranged above boronene.The optical conductivity of boronene in terahertz frequency band is calculated by first principle, and then through design and simulation by finite-difference time-domain method, a broadband terahertz wave absorber is obtained.The boronene based on different uniaxial tensile strain is calculated, the designed wave absorber under different polarization directions, the working bandwidth of wave absorber is widened or reduced respectively, the wave absorber changes from isotropic to anisotropic, solves the problem that existing broadband terahertz wave absorber is difficult to actively control, simultaneously expands the terahertz working bandwidth of wave absorber, realizes the characteristics of active control in broadband terahertz wave absorption work.