22 results about "Large strain" patented technology

An optical frequency domain reflectometer with environmental disturbance resistance and large strain measurement capability belongs to the field of distributed optical fiber sensing and comprises an opposite sweep frequency light frequency modulation continuous wave signal generation module, a light splitting device, a modulation device, a circulator, a polarization controller, an optical coupling device, a photoelectric conversion module and a data acquisition and processing module. An optical signal generated by an opposite sweep frequency light frequency modulation continuous wave signal generation module is divided into probe light and local oscillation light through a light splitting device, the probe light is modulated through a modulation device and sent to an optical fiber through a circulator, and a Rayleigh back scattering light signal generated by the optical fiber and the local oscillation light interfere in an optical coupling device to obtain interference light; the photoelectric conversion module mixes beat frequency signals of interference light, and the data acquisition and processing module analyzes and processes the beat frequency signals. According to the invention, the position information of the Rayleigh backscattering point is marked by using the modulated probe light, the Rayleigh scattering signal at the corresponding position is restored, crosstalk between channels is inhibited, and high-precision measurement in a large dynamic range and resistant to environmental disturbance is realized.

The invention relates to a large-strain consolidation algorithm, equipment and medium for horizontal vacuum dehydration of sludge, and the algorithm comprises the following steps: 1, obtaining basic parameters of a constitutive relation of a target soil body through an indoor consolidation experiment and a penetration experiment, 2, obtaining load conditions of the target soil body through surveying a geological exploration report and an engineering design scheme, the method comprises the steps of (1) establishing a one-dimensional PHD consolidation model, (2) establishing a one-dimensional PHD consolidation model and deducing a control equation under equal strain conditions, (3) introducing a virtual time step and calculating the consolidation degree in a manner of carrying out segmented increment processing on time, (4) establishing the one-dimensional PHD consolidation model and deducing a control equation under equal strain conditions, and (5) calculating the final consolidation degree based on the virtual time step and the control equation, and further comprises equipment and a medium. According to the method, the influence of non-uniform consolidation is incorporated into the one-dimensional theoretical consolidation analysis of the Taisha foundation, and the consolidation coefficient is corrected by using the control equation based on the virtual time step and the strain condition, so that convenient and accurate consolidation calculation is realized.

The invention relates to the technical field of flexible electronic sensors, in particular to a flexible large strain sensor for crack detection and a preparation method thereof.The flexible large strain sensor comprises a skeleton-shaped packaging layer, the packaging layer comprises two rigid fixing ends, and the two rigid fixing ends are integrally connected through a sensitive unit section; a rigid reinforcing structure is embedded in each rigid fixing end, mechanical fixing holes are formed in each rigid fixing end and the corresponding rigid reinforcing structure in a penetrating mode, interdigital capacitor electrodes are embedded in the sensitive unit sections, and the interdigital capacitor electrodes are made of flexible conductive materials through laser ablation. The end part of the interdigital capacitor electrode is connected with a flexible extension wire, the tail end of the flexible extension wire is connected with an external lead, and the external lead is embedded between the packaging layer and the upper surface of the rigid fixed end; the problems that an existing flexible sensor is unstable in installation, contradictory in measuring range and precision and poor in environmental adaptability in structural crack detection are solved.

The application relates to a flexible strain sensor based on a double-thread conductive yarn and a preparation method thereof. The flexible strain sensor based on the double-thread conductive yarn comprises a core layer elastic yarn, an intermediate layer conductive material and an outer layer packaging material; the core layer elastic yarn is a double-thread yarn, the intermediate layer conductive material comprises a strain sensitive layer and electrodes fixed at two ends of the strain sensitive layer; the double-thread yarn comprises a supporting core yarn and a double-thread structure, and the double-thread structure is two spiral continuous convex structures formed on the surface of the supporting core yarn; the preparation method comprises the following steps: S1, preparing the double-thread yarn; S2, preparing the double-thread conductive yarn; S3, forming two electrodes at two ends of the double-thread conductive yarn; and S4, preparing the flexible strain sensor based on the double-thread conductive yarn. The preparation method is simple and easy to implement, the prepared flexible strain sensor based on the double-thread conductive yarn has a large strain working range, excellent linearity, low hysteresis and good sensitivity.

The invention discloses a waterproof sensor with fine and large strain detection capability. The waterproof sensor sequentially comprises a protective layer, a silver film, a graphene film and a flexible base material from top to bottom, a micro-column structure is arranged on the flexible base material; the graphene film is sprayed on the flexible base material to cover the micro-column structure; the silver film is arranged on the surface of the graphene film in a magnetron sputtering mode to form a conducting layer, and the two sides of the silver film are connected with wires. And the protective layer is poured on the silver film. The sensor prepared by the invention has waterproof capability and fine and large strain detection capability, and can be better applied to human body vital sign monitoring.

The pipeline steel comprises the following components in percentage by weight: 0.051 to 0.09 percent of C, 0.1 to 0.4 percent of Si, 1.5 to 1.9 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.19 percent of Cu, 0.05 to 0.19 percent of Ni, 0.11 to 0.35 percent of Cr, more than or equal to 0.6 percent and less than or equal to 1.1 percent of Ni + 3Cr, less than or equal to 0.13 percent of Mo, 0.02 to 0.08 percent of Nb, 0.005 to 0.035 percent of Ti, 0.001 to 0.004 percent of Ca, 0.010 to 0.045 percent of Alt, less than or equal to 0.006 percent of N, less than or equal to 0.0003 percent of B, less than or equal to 0.005 percent of O, less than or equal to 0.0002 percent of H and the balance of The method mainly aims at the welded pipe with the wall thickness of 25-40 mm and the caliber of phi 1016-phi 1422 mm, the yield strength of the welded pipe is 555-665 MPa, the tensile strength is larger than or equal to 625 MPa, the-20 DEG C low-temperature impact energy is higher than 1600 J, the-10 DEG C full wall thickness DWTT shear fracture area percentage is larger than 85%, meanwhile, the longitudinal yield strength is 530-640 MPa, the yield ratio is smaller than or equal to 0.85, and the uniform ductility is larger than or equal to 7%.

Devices and methods for measuring the mechanical properties of soft materials, including biological materials, are disclosed. Embodiments include devices and methods wherein sensors and actuators are collocated with one another reducing complexities and uncertainties of traditional devices with separate sensors and actuators that are merely coupled to one another. Additional embodiments include devices and methods capable of applying large strains during the stimulation and sensing (deformation and measurement) process of determining the mechanical properties, which is some embodiments enables the determination of strain-dependent stiffness and viscoelasticity.

This invention discloses an oil well casing with high strength, high toughness, and large strain performance, and its preparation method, belonging to the field of oil and gas development casing preparation technology. The oil well casing disclosed in this invention, possessing high strength, high toughness, and large strain performance, is micro-alloyed by adding alloying elements Mn, Si, Cr, Ni, Mo, Al, Nb, and V to medium-low carbon, while controlling the content of harmful elements such as P, S, O, H, and N. This ensures that the final composition meets the requirements of oil and gas wells under complex operating conditions for large strain casing. According to relevant experimental results, the yield strength of the oil well casing with the above composition reaches 110 kSi, 125 kSi, and 140 kS, respectively, with a yield strength ratio ≤0.89~0.93 and a uniform elongation ≥15~20%, meeting the practical requirements of oil and gas wells under complex operating conditions.

The invention discloses an additive and subtractive composite manufacturing online monitoring method, which comprises the following steps of: acquiring strain characteristics in an additive and subtractive process by utilizing a monitoring and feedback control system comprising a substrate, a strain gauge, a strain collector, a data processing computer, an additive and subtractive composite forming control system and a motion system; according to the method, real-time monitoring of substrate deformation in the additive and subtractive composite manufacturing process is achieved, whether process adjustment of additive and subtractive composite manufacturing needs to be carried out or not is judged by comparing strain signals with strain signal preset values in a process adjustment database, feedback control is achieved, the local large strain phenomenon in the additive and subtractive manufacturing process can be found in time, and the production efficiency is improved. The method has the advantages of preventing crack defects, monitoring the state of the cutter, optimizing the roughness and dimensional precision of the machined surface, solving the problem of part machining failure caused by hot cracks or low precision in additive and subtractive composite manufacturing, and having wide application prospects and remarkable technical advantages.

This invention belongs to the field of steel production technology, specifically relating to a 1000MPa grade high-strain hydroelectric steel plate and its preparation method. Its chemical composition and mass percentage are as follows: C: ≤0.08%, Si: 0.20%–0.30%, Mn: 0.30%–0.70%, Cr: 0.30%–0.60%, Mo: 0.20%–0.40%, Ni: 2.50%–3.00%, Al: 0.02%–0.03%, Nb: 0.03–0.06%, V: 0.03–0.06%, Ti: 0.01–0.02%, S: ≤0.004%, P: ≤0.015%, with the balance being Fe and unavoidable impurity elements. This invention achieves a microstructure of ferrite, bainite, and retained austenite through rational composition design and control of rolling and online relaxation-rapid cooling processes. By controlling the content of retained austenite and ferrite, a hydroelectric steel plate with low yield strength ratio, high plasticity, and high toughness is obtained.

The invention relates to the technical field of bionic artificial muscles, in particular to a bionic artificial muscle with a spiral-crack integrated structure and a preparation method of the bionic artificial muscle. A carbon nanotube dispersion liquid is sprayed on the surface of a spiral liquid crystal elastomer, and a porous carbon nanotube layer with a microcrack network is formed in situ on the surface of the spiral liquid crystal elastomer by utilizing the synergistic effect of rapid volatilization of a solvent and stress release of a matrix, so that the bionic artificial muscle with a spiral-crack integrated structure is prepared. Through the unique spiral-crack integrated structural design, the technical contradiction that high-sensitivity sensing and large-strain driving are difficult to cooperate is fundamentally solved, and organic unification of driving strain amplification, a wide strain range and high linearity is achieved. The artificial muscle prepared by the method has excellent structural stability, actuating performance and strain sensing performance, and has wide application prospects in the fields of soft robots, wearable equipment, intelligent prostheses and the like.

This invention provides a method for improving the fatigue life of flexure components in harmonic reducers, belonging to the field of metal microstructure control technology. This invention achieves grain refinement and homogenization, avoids carbides, greatly increases the stability of the retained austenite structure, prevents its decomposition under mechanical driving force during large strain processes, avoids microstructural changes that affect performance stability, eliminates residual stress, and improves the fatigue life of the flexure, enabling it to meet long-life service requirements.

The invention discloses a preparation method and application of a flexible strain sensor based on an SERS (Surface Enhanced Raman Scattering) technology, and belongs to the field of optical strain sensing. The invention aims to solve the technical problems that the current mainstream optical strain sensing technology is limited in measuring range, the precision and the measuring range are difficult to consider at the same time, and the large strain detection requirements of flexible structures such as low-altitude aircrafts are difficult to adapt. According to the flexible strain sensor based on the SERS technology, a compact 4-MBA-Au NPs single-layer film is formed through a three-phase interface self-assembly method, and the compact 4-MBA-Au NPs single-layer film is successfully transferred to the adhesive surface of a VHB adhesive tape with ultrahigh flexibility and elasticity; the prepared sensor can realize 0-24% wide-range strain detection, the measurement precision is + / -2% FS, the limitation of the existing optical sensing technology on the detection range is broken through, and due to the excellent adhesion of the VHB adhesive tape, the sensor can be easily integrated on the surface of a material to be detected, and the sensor has a good application prospect.

The crack sensor based on metal glass large strain range high sensitivity comprises, from bottom to top, an insulating layer, an adhesion layer, a metal glass layer and a crack silver film; the insulating layer is formed by deposition on a strain detection part through a magnetron sputtering mode; the adhesion layer is formed by deposition of metal titanium on the surface of the insulating layer through a magnetron sputtering mode; the metal glass layer is deposited on the surface of the adhesion layer through a sputtering mode; and the crack silver film is prepared by sputtering a metal silver film on the surface of the metal glass layer in a pre-compressed state and releasing the strain to prepare the crack silver film. The crack sensor can be prepared in situ and conformally, has strong adhesion to the substrate, good sensitivity, can effectively convert the generated strain into resistance change, and has great practical production significance.

The application discloses an optical frequency domain reflectometer with environmental disturbance resistance and large strain measurement capability, and belongs to the field of distributed optical fiber sensing.The optical frequency domain reflectometer comprises a frequency-modulated continuous wave signal generation module, a light splitting device, a modulation device, a circulator, a polarization controller, an optical coupling device, an optoelectronic conversion module and a data acquisition and processing module.The frequency-modulated continuous wave signal generation module generates an optical signal, which is split into probe light and local oscillator light by the light splitting device.The probe light is modulated by the modulation device and is sent to an optical fiber by the circulator.The Rayleigh backscattering light signal generated by the optical fiber and the local oscillator light interfere with each other in the optical coupling device to obtain interference light.The optoelectronic conversion module mixes beat signals of the interference light, and the data acquisition and processing module analyzes and processes the beat signals.The probe light is modulated to mark the position information of the Rayleigh backscattering point, and the Rayleigh scattering signal corresponding to the position is restored, so that the crosstalk between channels is suppressed, and high-precision measurement with large dynamic range and environmental disturbance resistance is realized.

The invention discloses a method for preparing an ultrahigh-strength single crystal copper wire with a heterogeneous bimodal structure, and belongs to the field of preparation of high-performance copper-based wires. According to the method, a room-temperature continuous cold drawing process is adopted, and the drawing speed and pass are regulated and controlled by stages: the speed of 50-150m / min is adopted in a low-speed section with the wire diameter of 12-22mm; the speed is gradually increased to 200-1000 m / min at the medium speed section of 8-3 mm; and the speed is further increased to 1000 to 1550m / min at a high-speed section of 3 to 0.1 mm. By means of the process, large strain accumulation and the high strain rate are utilized, the {111} texture and the {100} texture are promoted to generate differential dynamic recrystallization in the wire, and therefore the heterogeneous double-peak structure composed of a hard deformation structure and a soft recrystallization structure is formed. By means of the method, the single crystal copper wire with the wire diameter smaller than or equal to 0.1 mm can be stably prepared, and the urgent requirements of Ai operation, high-frequency transmission and medical wire harnesses for the high-strength and high-conductivity superfine copper wire are perfectly met.

The application is a kind of steel cyclic loading test anti-instability device, including instrument upper loading head, first pin bolt, first group of nuts, first threaded clamp, extensometer, first nut, test piece, second nut, second threaded clamp, second group of nuts, second pin bolt, instrument lower loading head and pin bolt hole; the device has lower manufacturing cost, simple installation and smaller size; the pre-tightening force of the threaded bolt is used to complete clamping and limit the translation and rotation of the test sample; through strong constraint of the test piece, the steel compression instability is prevented, so as to realize large strain cyclic loading, and the steel cyclic loading test data can be accurately tested before buckling instability, and the material characteristics reflected by the test are more accurate.

The invention discloses a manufacturing method of an Mg-Sc shape memory alloy matched with service environments of the moon and the Mars and having large strain and wide temperature range performance, and belongs to the field of research of high-performance shape memory alloys for moon and Mars exploration. The invention aims to solve the problems of low hyperelastic temperature window, low recoverable strain and the like of the Mg-Sc alloy. Cyclic heat treatment after deformation is adopted to induce abnormal growth of crystal grains, materials in different crystal grain states are prepared, and the reason of the abnormal growth of the crystal grains is from huge internal stress and subboundary generated in the materials in the cyclic phase change process. The prepared single crystal material is subjected to low-temperature aging treatment, so that an alloy parent phase is converted into an ordered state from a disordered state, and the yield strength of the alloy is remarkably improved, so that the recoverable strain of the Mg-Sc alloy is improved; in addition, due to the ordered nanometer domain formed in the ordered state, the stress lag in the superelastic deformation process of the alloy is effectively reduced, the superelastic deformation critical stress sensitivity is reduced, and then the superelastic temperature window of the alloy is increased. When the alloy exists in the form of a large-size single crystal, and the result is shown as lt; 110gt, 110gt; and when the crystal is oriented, the hyperelasticity is particularly remarkable.

The application provides a strain sensing sensitive unit based on a nickel-titanium alloy wire, which comprises a base material, a plating layer and a micro-slit structure, wherein the base material is a nickel-titanium alloy wire; the application has the advantages that the plating layer is formed on the surface of the nickel-titanium alloy wire, and the nickel-titanium alloy wire after plating is subjected to cyclic loading and unloading training with a maximum strain of 8%, so that the plating layer on the nickel-titanium alloy wire forms a stable micro-slit structure; compared with the prior art, the strain sensing sensitive unit can realize high sensitivity and large strain sensing simultaneously during use, and has important significance for the application field of strain sensing of intelligent systems.

The invention discloses a maximum strain position measuring and positioning method, and relates to the technical field of vibration fatigue strength tests of engine blades and materials, and the method comprises the steps: building a three-dimensional geometric model of a to-be-tested blade 4, carrying out the finite element simulation analysis, obtaining a full-field strain distribution rule, and determining a region where the maximum strain distribution is located; resistance strain gauges are pasted on the central axis of the maximum strain distribution area of the blade back face at equal intervals, and the distance between the sensitive grid center of each resistance strain gauge and the blade root is recorded; applying resident excitation with constant amplitude under the resonant frequency of the to-be-tested blade 4, and collecting the strain value of the resistance strain gauge; constructing a matrix equation set of a strain distribution quadratic function, and solving coefficients to obtain a strain distribution function; and calculating the distance between the maximum strain position point and the blade root according to the strain distribution function, and pasting a resistance strain gauge at the maximum strain position point to carry out stress calibration measurement of the fatigue strength test.