21results about How to "Increase strain" patented technology

The invention relates to preparation and application of a wearable hydrogel sensor for strain and temperature dual-mode monitoring, and the preparation method comprises the following steps: 1, mixing acrylamide, N, N-methylene bisacrylamide, PEDOT: PSS, beta-cyclodextrin and gallic acid; step 2, after mixing, putting the mixture into a mixed solution of glycerol and deionized water, and uniformly stirring at normal temperature to obtain a conductive hydrogel precursor solution; 3, adding ammonium persulfate into the hydrogel precursor solution, and uniformly mixing to obtain a hydrogel precursor solution; step 4, cutting an I-shaped mold and an S-shaped mold, pouring the precursor solution in the step 3 into the mold, and obtaining conductive hydrogel under a heating condition; 5, conductive adhesive tapes or wires are arranged on the left side and the right side of the conductive hydrogel and directly extend to serve as lead wires connected with external equipment, waterproof breathable adhesive tapes are used for packaging, the I-shaped hydrogel serves as a strain sensor, the S-shaped hydrogel serves as a temperature sensor, and an IS wearable sensor is formed. According to the invention, the two modes do not interfere with each other.

The invention relates to the technical field of soft robot polymers, in particular to a preparation method of a temperature stimulation deformation reversible response soft robot polymer. Comprising the following steps: firstly, carrying out solution blending polymerization on linear semi-crystalline high-molecular polyethylene vinyl acetate and a peroxide initiator benzoyl peroxide to serve as a soft robot polymer matrix; a particle leaching method is used for making pores in a polymer semi-crystalline system, and the particle size parameter of a pore-foaming agent is adjusted to design the structural characteristics and pore morphology of a three-dimensional pore channel; finally, the linear molecules are subjected to mutual bonding bridging reaction to form the soft robot polymer with an entangled network cross-linked network and crystallization network structure. The soft polymer is prepared by constructing, regulating and controlling the three-dimensional porous structure, and the complex pore stress distribution of the porous structure aims at realizing high driving strain, so that the driving strain of the deformable soft intelligent porous driving material is regulated and improved, and adjustable driving performance and driving multifunctionalization are realized.

The invention discloses a UHPC (Ultra High Performance Concrete) material with high volume weight and high elastic modulus and a preparation method thereof, belongs to the field of cement concrete, and solves the problem of how to improve the volume weight and the elastic modulus of the UHPC material. The material comprises cement, fly ash microbeads, silica fume, bauxite, corundum particles, aluminum oxide, steel fibers, a polycarboxylic acid water reducer and water. The preparation method comprises the following steps: mixing and stirring the cement, the fly ash microbeads, the silica fume and the aluminum oxide, adding the polycarboxylic acid water reducing agent and the water, and stirring to obtain neat paste; adding bauxite and corundum particles into the neat paste and stirring; and adding the steel fiber and stirring. The UHPC material with ultrahigh volume weight and elasticity modulus is prepared by replacing traditional quartz powder and quartz sand with high-performance aggregate bauxite and corundum particles, and the key problem that the volume weight and elasticity modulus of UHPC are difficult to greatly improve is solved; the UHPC performance is improved through the synergistic effect of the corundum particles and the steel fibers, and the stress and strain for resisting compression are improved to the maximum extent.

The present invention proposes a polyurethane preparation method and a polyurethane-based toughened bonded explosive preparation method, which belongs to the technical field of polyurethane materials. The supramolecular polyurethane-based polymer bonded explosive prepared by the preparation method of the present invention has more advantages in strength and toughness, and significantly improves the mechanical properties of the bonded explosive. The high-density hydrogen bonds in its supramolecular polyurethane network interact to form physical crosslinking points, enhance the intermolecular force to improve the strength, and the dynamic fracture and reconstruction process of the hydrogen bonds can fully dissipate energy, giving high stretchability and toughness. The supramolecular polyurethane material has both high strength and high toughness. The Brazilian tensile test shows that the bonded explosive has great advantages in the field of polymers used for bonded explosives. The present invention provides a new way to improve the performance of bonded explosives, has good application prospects, and provides a new technical approach and solution for the development of the field of energetic materials.

The invention relates to a pure nickel tube plate forging method. The method comprises the following steps: sawing an electroslag ingot electrode plate end and a feeding end; heating is performed; forging: rolling an ingot body; upsetting and drawing for two times, and spinning after upsetting for the third time; cooling after forging; annealing is conducted; wherein the electroslag ingot comprises the following chemical components in percentage by weight: greater than or equal to 99.0% of Ni; cu < = 0.25%; less than or equal to 0.40% of Fe; mn < = 0.35%; less than or equal to 0.15% of C; si < = 0.35%; s is less than or equal to 0.01%. The electroslag ingot is adopted as the raw material, non-metallic inclusions and harmful elements are few, the phenomenon of composition segregation is reduced, the grain uniformity is good, meanwhile, the content of C in the raw material is increased, the strength and hardness of a forge piece can be improved, three-time upsetting and two-time drawing are conducted during forging, the forging deformation is increased, strain is improved, grains are refined, and the strength and toughness are improved; the tensile strength of the forge piece is larger than or equal to 380 Mpa, the yield strength is larger than or equal to 105 Mpa, and the hardness HRB is

This invention discloses a method for preparing a tear-resistant elastic gel, comprising the following steps: adding monomer molecules, a crosslinking agent, and a nano-confined material to a solvent, and performing a polymerization reaction under ultraviolet light irradiation in the presence of a photoinitiator to obtain the tear-resistant elastic gel. This invention utilizes the polymerization of monomer molecules and crosslinking agents initiated by a photoinitiator within the confined space of the nano-confined material. The strong hydrogen bonding between interpenetrating polymer segments effectively immobilizes polymer chains that may slide under load, preventing energy dissipation. Simultaneously, the rigid nano-confined material prevents stress concentration at crack tips in the host material and significantly reduces the crack propagation sensitivity of the prepared gel, thereby improving the strength, strain, crack propagation resistance, and elasticity under ultimate deformation of the gel material, thus obtaining a tear-resistant elastic gel.

This invention discloses a solution-driven collagen-based artificial muscle, its preparation method, and its application. The preparation method of the artificial muscle includes the following steps: dissolving collagen powder in water, adding acetic acid to swell the solution, and mixing thoroughly to obtain a collagen solution; preparing a coagulation bath; adding the collagen solution to the coagulation bath, and obtaining collagen fibers through wet spinning; subsequently, twisting and shaping the obtained collagen fibers to obtain the solution-driven collagen-based artificial muscle. This invention, by combining wet spinning and twisting techniques, prepares a collagen-based artificial muscle with both excellent mechanical properties and good biocompatibility. This muscle exhibits high flexibility, long cycle life, fast response speed, and high strain. The entire preparation process is simple to operate, and the raw materials are inexpensive and readily available.

The invention belongs to the technical field of battery materials, and particularly relates to a tellurium modified ternary positive electrode material and a preparation method and application thereof. The preparation method of the tellurium modified ternary positive electrode material provided by the invention comprises the following steps: 1) mixing a ternary precursor, a lithium source and a first tellurium source, and performing first sintering to obtain a primary sintered product; 2) mixing the primary sintered product obtained in the step 1) with a second tellurium source, and performing secondary sintering to obtain a secondary sintered product; and 3) washing the secondary sintered product obtained in the step 2) with water, mixing with boric acid, and calcining to obtain the tellurium modified ternary positive electrode material. The tellurium modified ternary positive electrode material prepared by the preparation method disclosed by the invention is high in specific capacity and high in first efficiency and cycle performance.

The application discloses a PZT-based textured piezoelectric ceramic and a phase transition assisted polarization preparation method and application thereof, and belongs to the technical field of piezoelectric materials. The preparation method comprises the following steps: preparing PMeN-PZT matrix powder; preparing a textured piezoelectric ceramic; and sequentially polishing the textured piezoelectric ceramic, sintering silver electrodes and performing phase transition assisted polarization to obtain the PZT-based textured piezoelectric ceramic; wherein the phase transition assisted polarization step is: heating the textured piezoelectric ceramic after sintering silver electrodes to a polarization temperature, the polarization temperature is higher than the trigonal-tetragonal phase transition temperature and lower than the Curie temperature, and the polarization is performed under a polarization electric field of 300 V / mm-1000 V / mm, then the polarization is naturally cooled to room temperature, and the electric field is removed. The technical problems of low piezoelectric / electromechanical / dielectric performance caused by insufficient polarization in traditional heating polarization and the technical problem that piezoelectric materials are difficult to have high piezoelectric performance and high Curie temperature at the same time are solved.

The invention provides a nano-beam gradient response prediction method, system and device and a storage medium, and the method comprises the steps: obtaining a nano-beam strain data set of a target nano-beam, converting the nano-beam strain data set into a nano-beam strain sequence, determining the cohesion loss of the target nano-beam according to the nano-beam strain sequence, and obtaining the gradient response of the target nano-beam. Determining the nano-beam variable curvature of each nano-beam strain in the nano-beam strain data set according to the nano-beam strain data set and a real-time surface load, and determining an extension decision factor corresponding to each nano-beam variable curvature through the cohesion loss, and determining a plurality of stress response characteristic prediction cardinal numbers of the target nano-beam according to all the extension decision factors and the nano-beam strain data set, and predicting the gradient response of the target nano-beam through all the stress response characteristic prediction cardinal numbers, so that the interference of external temperature on the prediction of the gradient response of the nano-beam can be avoided.

The invention provides a forge piece design method for preventing a deformation dead zone at the bottom of a large barrel-shaped forge piece. The method comprises the steps that a two-step boss structure is additionally arranged on the outer side area of the flat bottom of the forge piece; performing shape matching design on a lower die or a lower ejection die structure corresponding to the bottom of the forge piece; carrying out three-dimensional modeling; performing analog simulation on the large special-shaped barrel forge piece, and adjusting the height and width of a two-step boss structure at the bottom of the forge piece and the matched shape and size of a lower die or a lower ejection die according to strain distribution of the large special-shaped barrel forge piece; streamline distribution of the large special-shaped barrel forge piece is analyzed, it is ensured that a to-be-machined part area is uniform in deformation and smooth in streamline, and the structure property requirement is met. According to the method, deformation dead zones on the two sides can be effectively moved outwards or downwards to the position below the to-be-machined part area, meanwhile, the possibility that the deformation dead zones appear in the center area is prevented due to increase of the bottom deformation amount, and it is greatly guaranteed that strain of the to-be-machined part area at the bottom of the large special-shaped barrel-shaped forge piece is evenly distributed, and the streamline is smooth and reasonable.

The present invention provides a polyamide resin composition, wherein a molded product thereof has a low hydrogen permeability coefficient and a good tensile fracture nominal strain at low temperature (-40°C). The present invention relates to a polyamide resin composition, which comprises a polyamide resin (A), an impact-resistant material (B) and an inorganic compound (C), wherein the polyamide resin (A) comprises an aliphatic homopolyamide resin (A-1) and an aliphatic copolymer polyamide resin (A-2), and the content of the inorganic compound (C) is 1.60 to 3.00 parts by weight relative to 100 parts by weight of the impact-resistant material (B).

The invention discloses a three-step combined protection material for softening and reinforcing lacquer soil remain, a method and application, and relates to the technical field of cultural relic protection. The protection material comprises a paint film softening agent, a paint film reinforcing agent and a soil body reinforcing agent, according to the protection method, the paint film softening agent, the paint film reinforcing agent and the soil body reinforcing agent sequentially permeate, soften and reinforce a paint film and a soil body, and the effects of integrally protecting paint soil remain and improving the adhesion strength of the paint film and a filling supporting body are achieved; the environmental stability of the lacquer soil property storage is obviously improved, and the aim of storing the lacquer soil property storage for a long time in a normal library collection environment is achieved. The three-step combined technical method disclosed by the invention has the characteristics that the paint film softening effect is good, the paint film is firmly attached to the soil body, the whole soil body is reinforced, and the stability of the residual environment after reinforcement is high; and the used protective reagent has the advantages of being green and safe, good in compatibility with the paint soil property, low in cost, simple in process and wide in application range.

The invention provides a wind driven generator thread structure monitoring device and method based on optical fiber sensing, and the device comprises a thread structure, sensing optical fibers, a first spring, a second spring and a third spring, the structures and initial states of the first spring, the second spring and the third spring are the same, and each spring is uniformly provided with a sensing optical fiber segment along the coiling direction. The three sensing optical fiber sections are connected in series and then connected with the strain measurement system, the first spring and the second spring are symmetrically arranged on the upper side and the lower side of the tower, the first spring is arranged between the top end of a nut of the bolt and the nut side of the tower, the second spring is arranged between the bottom end of the nut and the nut side of the tower, and the third spring is arranged between the bottom end of the nut and a connecting plate at the bottom end of the bolt; and the strain measurement system determines the loosening condition of the thread structure and the temperature of the wind driven generator according to the measured dependent variable of each sensing optical fiber section. The loosening condition of the thread structure and the temperature of the wind driven generator can be accurately and simultaneously monitored through the sensing optical fiber, and the structure is simple.

The invention discloses a manufacturing method of an electromagnetic self-powered strain sensor, and relates to the technical field of sensors, and the method is based on an electromagnetic induction principle to design an energy collection device which comprises a sleeve whose outer wall is wound with a coil, and a fixed magnet and a suspension magnet which are arranged in the sleeve. Structural parameters meeting power supply requirements are determined by combining energy conversion analysis on the energy collection device, and then the energy collection device is manufactured according to the design structure and the structural parameters. The energy collection device is excited by external vibration to generate alternating-current electric energy in the moving process of the moving object to be monitored and supplies power to the sensing monitoring device through the rectification energy storage circuit, so that the sensing monitoring device can continuously and stably sense the strain of the position to be detected of the moving object to be monitored without being externally connected with other power supplies.

The application provides a high-toughness ferrite-pearlite type non-quenched and tempered steel and a manufacturing method thereof, and the composition of the steel is as follows: C 0.35-0.42%, Si 0.35-0.45%, Mn 1.25-1.65%, P ≤0.010%, S 0.025-0.050%, Cr 0.10-0.30%, Nb 0.02-0.05%, Mo 0.010-0.050%, Ni 0.10-0.25%, Al 0.025-0.045%, V 0.10-0.30%, Cu ≤0.10%, Ti 0.010-0.040%, [N] 120-160ppm, [H] ≤1.0ppm, T.O ≤10ppm; the rest is Fe and inevitable impurity elements; the steel is combined with a controlled rolling and controlled cooling process, the ferrite content is increased, the strength and toughness are improved, the strength and toughness are matched, and the cutting performance is improved.

The invention discloses a preparation method and application of a textured ceramic / nano-silver particle composite laminated piezoelectric actuator, and belongs to the technical field of piezoelectric ceramics. The preparation method comprises the following steps: firstly, preparing a [001] c oriented barium titanate seed crystal template, and preparing lead-free 1-x (B < 0.5 > Na < 0.5 >) T O < 3-x > Ca (A < l > < 0.5 > Nb < 0.5 >) O < 3 > texture ceramic oriented along the [001] c height by adopting a template oriented growth technology; then preparing modified nano-silver particles; and finally preparing the textured ceramic / nano-silver particle composite laminated piezoelectric actuator through a casting film preparation method. The piezoelectric actuator can be widely applied to piezoelectric power generation materials such as a piezoelectric micro-displacement actuator and a piezoelectric sensor which are stable in piezoelectric performance, high in sensitivity and high in accuracy.

The method for recovering information of optical frequency domain scattering distributed optical fiber sensing based on wavelet decomposition belongs to the field of distributed optical fiber sensing technology; the method uses wavelet decomposition as a spatial / spectral domain analysis tool for distributed optical fiber sensing, and repeatedly performs wavelet decomposition on distributed optical fiber sensing signals or targeted wavelet decomposition on positions of interest. The coefficients of wavelet decomposition correspond to the reflectivity or scattering spectra of sensing units at different positions, and the two reflectivity or scattering spectra before and after the strain or temperature change at the same spatial position are cross-correlated and calculated to obtain the spectral offset of each spatial position, thereby obtaining the distributed strain or temperature. The present invention has the characteristics of being able to independently set spatial resolution and spectral resolution, and is not affected by the mutual restriction relationship between the two. Under the same spatial resolution, the strain / temperature resolution is higher, and the distributed sensing local information of a certain section of optical fiber position of interest can also be recovered, greatly improving the demodulation speed.

The invention discloses a preparation method of a low-cost high-nickel positive electrode material. The preparation method comprises the following steps: uniformly mixing a transition metal hydroxide precursor with a lithium source, and pre-sintering at 300-550 DEG C in an oxygen-containing atmosphere to obtain a first sintered material; uniformly mixing the first sintering material with a first additive and a second additive, and performing secondary sintering at 700-850 DEG C in an oxygen-containing atmosphere to obtain a second sintering material; crushing, centrifugally washing and drying the second sintered material to obtain a positive electrode material matrix; and uniformly mixing the positive electrode material matrix with a boron-containing compound, and carrying out low-temperature sintering at 200-400 DEG C in an oxygen atmosphere to obtain the high-nickel positive electrode material. The high-nickel positive electrode material prepared by the invention has the characteristics of high structural stability, high particle mechanical strength and excellent recycling performance.

The invention discloses a covalent cross-linked aramid nanofiber aerogel film as well as a preparation method and application thereof, and belongs to the technical field of thermal insulation materials and thermal insulation materials. The preparation method comprises the following steps: mixing aramid nanofiber sol and halogenated hydrocarbon, then carrying out covalent cross-linking, and then carrying out membrane scraping treatment, acid coagulation bath and water bath treatment to obtain a wet gel membrane; and then carrying out solvent replacement and drying to obtain the covalent cross-linked aramid nanofiber aerogel film. The mechanical property of the prepared CCAAM is effectively improved, nanofibers formed by crosslinking are stacked to form a compact hole wall, the breaking strength is improved, a hierarchical hole nanofiber skeleton honeycomb enables the CCAAM to have more deformability, the strain is improved, and meanwhile, the crosslinked aerogel film is effectively toughened.

The present invention belongs to the field of sodium ion batteries, and specifically discloses a sodium ion battery positive electrode active material with exposed {010} crystal planes and a preparation method thereof. In addition, a special sodium-containing micron-sized single crystal rod-like precursor for preparing the active material and a preparation method thereof are also disclosed. Based on the preparation of the special precursor, the present invention directly performs an oxidative roasting treatment to obtain an active material with high electrochemical performance and air resistance stability.