29453results about "Material strength using tensile/compressive forces" patented technology

The invention relates to the technical field of anti-cracking performance testing, in particular to an ultra-high performance concrete anti-cracking performance testing system and a dynamic monitoring method thereof.The system comprises a dynamic stress field simulation feedback module used for sensing three-dimensional distribution of a micro stress field in concrete in real time by constructing a flexible loading array to obtain dynamic stress field data; the multi-scale damage evolution tracking module is used for deploying a high-resolution acoustic emission network and a distributed optical fiber sensing layer based on dynamic stress field data of the flexible loading array to form a full-scale evolution graph from microdefects to macroscopic cracks; and the intelligent healing efficiency evaluation module obtains stress redistribution data and a full-scale evolution graph, and a repairing medium containing a tracer agent is injected into a preset crack path. According to the method, the whole process of crack resistance of the material from defect initiation to repair and regeneration can be quantitatively evaluated; and finally, outputting a dynamic evolution rule of the crack resistance and enhancing potential evaluation.

The invention discloses a wharf armor block quality detection method, and belongs to the technical field of concrete structure detection.The method comprises the steps that a surface model is constructed through a movable three-dimensional laser scanning device, and a high-risk defect area is recognized; performing encryption scanning and impact echo detection in the high-risk area by adopting a frequency-adjustable dual-mode flaw detection device to generate a three-dimensional defect distribution diagram; a core sample is drilled in the defect area for compressive strength testing, and the material performance is analyzed in combination with a non-contact infrared spectrum; and establishing a dynamic evaluation model, calculating a safety coefficient by integrating surface defects, internal defects and material discreteness data, and generating a three-dimensional visual report. The problems that a traditional detection method is low in efficiency, insufficient in internal defect positioning precision, one-sided in material performance evaluation and the like are solved, full-dimensional detection from the surface to the interior and from the macroscopic level to the microscopic level is achieved through a multi-source data fusion and closed-loop feedback mechanism, and the reliability of structural safety evaluation and the scientificity of maintenance decision are remarkably improved.

The invention relates to the technical field of detection, and discloses a polyurethane material performance detection method, which comprises the following steps: clamping a material to be detected on a loading platform, cooperatively controlling and simulating the stress effect of a target application scene, and capturing a time sequence image of the microstructure of the surface of the material by adopting a visual unit; synchronously acquiring internal strain distribution data through a distributed strain sensing array, acquiring a dynamic stress response spectrum in combination with a piezoelectric mechanical sensor, and generating a multi-modal deformation characteristic data set; performing crack density and texture orientation analysis on the time sequence image, extracting a crack growth rate and a direction consistency coefficient, and marking a strain concentration area; calculating an apparent elastic modulus attenuation rate based on the dynamic stress response spectrum, establishing a material performance degradation model, generating a dynamic flexible performance index through a weighted fusion algorithm, and performing graded evaluation on the material; material detection is upgraded from a single mechanical test to a multi-physics coupling intelligent evaluation system, and accurate and reliable detection support is provided for multiple application scenes.

Disclosed are a dynamic disturbance-induced rock burst test device and a test method. The test device comprise a supporting platform, a plurality of loading plates, an electromagnetic pulse emitting system, an acoustic emission monitoring system, a high-speed camera, an electromagnetic radiation detecting system and a confining pressure servo control loading system. The plurality of loading plates are arranged on a side wall of a coal rock sample and are placed inside a square chest, the electromagnetic pulse emitting system and the confining pressure servo control loading system are arranged inside a bar system, and an acoustic emission probe is arranged inside the loading plate. A three-dimensional real stress environment of the coal rock is simulated by simulating a shear stress through friction between the loading plate and the sample, as well as dynamic and static combined loading of multi-axial and multi-directional static confining pressure and stress wave disturbance.

The invention discloses a hydrostatic guideway performance testing device and a hydrostatic guideway performance testing method. The hydrostatic guideway performance testing device comprises a base, a pressurizing assembly, a driving assembly, an oil supply assembly, a detection assembly and a processor. A guide rail groove is formed in the guide rail, the pressurizing assembly is arranged on the base and provided with a first position abutting against the static pressure sliding block to apply pressure to the static pressure sliding block and a second position separated from the static pressure sliding block, and the driving assembly is used for driving the static pressure sliding block to slide in the guide rail groove. The oil supply assembly communicates with the static pressure sliding block. The processor is electrically connected with the detection assembly, and the processor is at least used for calculating the rigidity of the oil film, judging the bearing capacity of the static pressure sliding block through the rigidity of the oil film and judging whether the motion performance of the static pressure sliding block meets the standard or not through the flow of oil in the static pressure sliding block. The static pressure guide rail performance testing device solves the problem that a static pressure guide rail performance testing device in the prior art cannot comprehensively test the performance of a static pressure sliding block.

The invention relates to the technical field of safety monitoring, in particular to a building bearing capacity detection system based on the Internet of Things, which comprises a strain load module, an offset gradient module, a rhythm risk module, a threshold judgment module and a map reconstruction module. According to the method, the maximum strain excursion and direction reversal characteristics of adjacent time windows are analyzed and captured through the dynamic frequency excursion gradient, the response sensitivity to microcosmic bearing capacity fluctuation is improved, a strain jump rhythm map is constructed, sudden change time point time difference, amplitude difference and direction continuity parameters are extracted, and an abnormal load section is accurately positioned. The method comprises the following steps: identifying sudden strain jump events, performing cross-level rhythm map multi-dimensional comparison by applying a dynamic time warping algorithm, screening synchronous mutation nodes to generate a risk set, performing density clustering sorting based on direction consistency parameters, reconstructing a security level topological map, and improving visual spatial relevance and dynamic evolution characteristics of a structural instability path.

The invention relates to the technical field of yarn performance detection, and particularly provides a colored spun yarn tensile property detection device and method, and the device comprises two supporting tables, a horizontal tensile test mechanism, an end fixing mechanism and a pressing test mechanism. According to the device for detecting the tensile property of the colored spun yarn, the abutting test mechanism, the end fixing mechanism and the horizontal tensile test mechanism are matched, so that the yarn is subjected to a two-way tensile test under abutting in different directions and is subjected to testing under abutting stretching of different positions and different depths in a tensile state; according to the yarn tensile property detection device, the stress conditions of the yarn from multiple directions in the actual use process are simulated, the tensile property of the yarn under local stress at different positions is detected, the tensile property of the yarn is comprehensively evaluated, the accuracy and authenticity of yarn tensile property detection are further improved, and meanwhile the practicability of yarn tensile property detection is also improved.

The invention discloses a water pressure testing device for steel pipe compression resistance detection and a testing method thereof.The device comprises a supporting assembly, a moving assembly and a fixed sealing assembly, the supporting assembly comprises a base and a pair of supporting frames fixedly connected with the top of the base, and the moving assembly is arranged above the base; the moving assembly is arranged on the base and fixedly connected with the base, and the fixed sealing assembly is connected with the moving assembly, used for fixing the steel pipe and capable of sealing the two ends of the steel pipe. The driving motor drives the positive and negative screw rod to rotate, so that the pair of moving plates move in opposite directions, the abutting blocks can abut against the inner wall of the steel pipe in the opposite moving process of the moving plates, the steel pipe can be stabilized through the abutting effect of the abutting blocks, the displacement phenomenon of the steel pipe during water pressure testing is avoided, and when the moving plates move, the steel pipe is prevented from moving. The steel pipe can be subjected to double-layer sealing, the sealing effect is good, and the accuracy of a test result can be improved.

The invention discloses a combined stress loading anchor rod rapid corrosion device and a test method, and relates to the technical field of anchor rod corrosion tests.The combined stress loading anchor rod rapid corrosion device comprises a base, a test box, a vertical plate, a servo hydraulic station, an axial force loading unit, a radial force loading unit, a salt mist generator and a controller; a first cavity, a second cavity and a third cavity are arranged in the device, an axial force loading unit is arranged on the left side of each cavity, an anchor rod limiting mechanism is arranged on the right side of each cavity, and a radial force loading unit is arranged at the bottom of each cavity. Each chamber is provided with an electrocorrosion generation assembly, a ceramic heating sheet is fixedly embedded in the bottom of each chamber, a temperature and humidity monitor is arranged on the outer side of the test box, and the salt mist generator is arranged outside the test box. The three independent chambers in the test box are used for salt mist, raining, soaking and protolith state simulation corrosion tests respectively, so that the test efficiency is improved, the temperature in the box is convenient to regulate and control, and the accuracy of environmental simulation data is improved.

The invention relates to the technical field of basalt fiber mesh detection, in particular to basalt fiber composite rib mesh strength testing equipment and method.The basalt fiber composite rib mesh strength testing equipment comprises a supporting table and a movable groove formed in the top of the supporting table, and a longitudinal stretching mechanism located above the movable groove is installed at the top of the supporting table; a transverse stretching mechanism is installed in the movable groove in a front-back sliding mode, a movement adjusting mechanism for driving the transverse stretching mechanism to move front and back is installed in the supporting table, and an angle positioning mechanism is installed at the front end of the longitudinal stretching mechanism. The mesh material is detected through cooperation of the longitudinal stretching mechanism, the transverse stretching mechanism and the movement adjusting mechanism, the longitudinal stretching mechanism is used for longitudinally stretching the mesh material, and the transverse stretching mechanism is used for transversely stretching the mesh material, so that stretching resistance detection is carried out in the warp direction and the weft direction of the mesh material; and the tensile property of the mesh material when the mesh material is simultaneously subjected to transverse and longitudinal tensile forces can be conveniently measured.

The invention relates to the field of glass testing, and discloses a glass plate cold bending test device, which comprises a mounting platform, a cold bending test device, a cold bending test device, a cold bending test device, a cold bending test device and a cold bending test device, and is characterized in that the mounting platform comprises a loading position and at least two diagonally arranged clamping positions; the testing mechanism is arranged at the loading position, a bearing piece of the testing mechanism is used for supporting the plate corner of the to-be-tested glass plate in the descending process of the bearing piece, and a loading assembly is used for applying pressure to the plate corner of the to-be-tested glass plate when the bearing piece is in a non-pressure state; the clamping mechanism is arranged at the clamping position and used for clamping the plate corner of the glass plate to be detected. The problem that the influence of dead weight on glass cold roll forming is ignored in a glass plate test is solved. And by reducing the height of the bearing piece, the deflection of the plate corner is increased under the action of gravity until the bearing piece cannot detect the pressure of the plate corner. The plate corner is subjected to a pressurization test through the loading assembly to complete a plate corner bending test, so that the performance evaluation of the cold-bent glass is more accurate, and the use risk after the cold-bent glass is formed is reduced.

The invention discloses a zinc coating shedding performance detection method and system, particularly relates to the technical field of metal surface treatment quality detection, and is used for solving the problems of high misjudgment rate and insufficient detection precision caused by coating surface pseudo defect interference in the existing method. The method comprises the following steps: synchronously acquiring a multispectral reflection image and three-dimensional morphology data of the surface of a zinc coating through an industrial vision imaging device, extracting grain boundary distribution information based on multispectral data, and identifying radial pseudo defects in combination with a curvature manifold geodesic line energy gradient direction of the three-dimensional morphology; and further performing micro-crack topology analysis and grain boundary spatial correlation verification on the candidate region, eliminating texture interference and grain boundary overlapping regions, and finally outputting a high-confidence fall-off defect detection result, so that the identification capability of real defects under a complex galvanized surface is remarkably improved, and the method is suitable for automatic detection requirements of a high-speed continuous production line.

The invention provides a civil construction monitoring intelligent sensor information detection method and system under signal mismatch, and the method comprises the steps: carrying out the time-frequency analysis of temperature and strain fundamental frequency components, selecting a wavelet basis function adaptive to the concrete setting and strength increasing process, carrying out the self-adaptive threshold processing of a wavelet coefficient, removing high-frequency noise, and carrying out the detection of the temperature and strain fundamental frequency components. Low-frequency signal characteristics reflecting concrete strength increase are reserved; performing feature extraction on the denoised temperature and strain signals by adopting a singular value decomposition algorithm, detecting internal defects of the concrete through abrupt change of a singular value spectrum, and if crack and hole defects exist, causing strain signal abrupt change by stress concentration; if it is detected that defects exist in the concrete, that is, spatial heterogeneity of temperature and stress distribution exists, temperature and strain monitoring data of multi-point arrangement and a defect detection result serve as boundary conditions and constraints, and a temperature field and a stress field in the whole concrete structure are obtained through numerical simulation.

To provide a test method for mechanical characteristics of combined electrical, thermal and mechanical deterioration of insulating oil-paper.SOLUTION: The present invention comprises: constructing an AC and DC / thermal / mechanical stress combined deterioration experimental platform; preparing insulating oil-paper samples with different deterioration states; measuring a degree of polymerization and tensile strength test of the insulating oil-paper samples with different deterioration states; acquiring change rules of mechanical characteristics after deterioration; observing microscopic morphology diagrams and XRD spectra of the insulating oil-paper samples with different deterioration states; constructing an amorphous unit cell of a cellulose molecular chain; optimizing a structure; acquiring a cellulose model; constructing an oil-paper mixed model; performing molecular dynamics simulation on the oil-paper samples with different deterioration states based on the cellulose model and the oil-paper mixed model; and constructing the relation between the deterioration of macroscopic mechanical characteristics of insulating oil-paper and changes in microscopic physical and chemical characteristics, where a data basis and theoretical support for prediction of a life of insulating paper are provided.SELECTED DRAWING: Figure 19

The invention discloses a textile fabric defect detection system, relates to the technical field of textile fabric defect detection, and is beneficial to comprehensively evaluating the appearance quality of textile fabrics by collecting the number of hair balls, a color difference value and the area of a color difference region in an external defect parameter collection process. The pilling phenomenon on the surface of the textile fabric can be accurately recognized by collecting the number of the hair balls, the overall appearance and the service life of the textile fabric can be affected by the hair balls, non-uniformity of the textile fabric in the dyeing process can be revealed through measurement of the color difference value, and the severity degree of the color difference problem can be determined through statistics of the area of the color difference region. In the external defect evaluation process, whether the textile fabric meets the quality standard or not can be objectively judged by analyzing the external defect evaluation index of the specified textile fabric, and in the structural defect analysis process, the structural performance of the textile fabric can be comprehensively known by collecting the fiber breaking strength, the fiber density and the porosity.

The invention relates to the technical field of composite fiber non-woven fabric manufacturing, in particular to a composite fiber non-woven fabric tensile property testing device which comprises a base, and an n-shaped support and a limiting sliding way located under the horizontal section of the n-shaped support are fixedly installed on the upper end face of the base. And a stretching mechanism for stretching the composite fiber non-woven fabric front and back is arranged on the limiting slide way. The tensile property test of the composite fiber non-woven fabric is completed by adopting an integrated operation model of stretching, twisting and extruding, the test reliability is improved by adopting a fixing mode of combining clamping of upper and lower cambered surfaces with matching of a rubber plate, a convex block and a groove, and meanwhile, the tensile property of the composite fiber non-woven fabric is improved through plane stretching, twisting and plane stretching tests after twisting as well as downward extruding and stretching of a middle section. The composite fiber non-woven fabric tensile property testing device can simulate complex stress conditions possibly faced by the composite fiber non-woven fabric in practical application, so that the tensile property of the composite fiber non-woven fabric in multiple stress states is comprehensively evaluated, multiple testing modes are realized on a single device, and the overall testing efficiency is improved.

The invention relates to the technical field of textile tension tensile test, in particular to a tensile degree detection mechanism for textile processing, comprising: a positioning base; a closed machining rack is assembled on the positioning base in an annular angle adjusting mode, and a stretching annular transmission structure and a longitudinal clamping stretching structure are symmetrically assembled along the middle of the inner side of the closed machining rack. The stretching annular transmission structure is matched with the longitudinal clamping stretching structure to carry out stretching detection on the cut textile; the device has a dynamic stretching test function, a servo motor drives a worm, a worm gear, a nut and a screw to perform spiral transmission, so that the clamping plate frames clamping textile cloth are far away from each other to perform stretching test, and a stretching annular transmission structure is matched with the servo motor rotating in the opposite direction to realize twisting stretching test on the textile cloth; more complex stress conditions are simulated, and the equipped monitoring camera is used for carrying out visual picture recording on textile cloth in a stretching test, so that a basis for real-time test monitoring and subsequent analysis is provided.

The invention provides a metal material surface difference analysis method which comprises the following steps: calculating Gibbs free energy at different temperatures by adopting a thermodynamic model according to chemical components and an initial microstructure of a material, and drawing a time-temperature-transformation curve of the material through phase diagram analysis software, obtaining a grain growth kinetic parameter and a recrystallization temperature interval; inputting data information of strength, hardness and toughness in different application scenes by utilizing the established multi-objective optimization model, and searching optimal grain size distribution through a genetic algorithm to obtain an optimal microstructure for balancing various performance indexes; according to the optimal microstructure, a heat treatment process route is reversely designed, finite element software is adopted to simulate temperature field and stress field distribution in the heat treatment process, and control parameters of heating, heat preservation and cooling are determined through iterative optimization.

The invention discloses a cable structure strength detection device and method, and relates to the field of cable structure detection.The cable structure strength detection device comprises a bottom plate, a plurality of supporting pieces are arranged at the upper end of the bottom plate, a main plate is arranged at the upper ends of the supporting pieces jointly, side plates are symmetrically arranged on the two sides of the main plate, and a lead screw is rotationally connected between the side plates jointly; the clamping assembly is arranged on the lead screw and used for clamping the cable. Through mutual cooperation of a limiting plate and a second air bag, air in the second air bag uniformly enters the first air bag through a communicating pipe, the air in the first air bag is increased, the air pressure in the first air bag is increased to apply pressure to the surface of the cable, and in the process of stretching the cable, the larger the stretching distance is, the larger the pressure to the surface of the cable is. Meanwhile, the surface of the cable can be prevented from being damaged through clamping of the first air bag, the accuracy of a cable detection result is improved, and pulling force is indirectly applied to the cable through the clamping plate.

The invention discloses a tensile test device for a PE protective film, and relates to the technical field of protective film test.The tensile test device comprises a main machine table, a feeding mechanism is fixedly installed on the upper surface of the left end of the main machine table and used for feeding and discharging, and a detection mechanism is fixedly installed on the upper surface of the right end of the main machine table and used for conducting tensile detection on a sample. A recycling box is fixedly connected to the middle position of the upper surface of the main machine table, and a control box is fixedly installed on the right front portion of the lower surface of the main machine table. Firstly, a left air cylinder is controlled to be started to drive a left clamping plate to downwards extrude a PE protective film into an anti-falling groove I, at the moment, clamping of the left ends of a plurality of samples is effectively completed, and then a right air cylinder is controlled to be started to drive a right clamping plate to downwards extrude the samples into an anti-falling groove II; at the moment, clamping of the right ends of a plurality of samples is effectively completed, and the stability of the clamped samples can be effectively improved through cooperative use of the first anti-disengaging groove and the second anti-disengaging groove.

The invention discloses an automatic single-yarn strength tester and a test method, and relates to the technical field of textile detection equipment, the automatic single-yarn strength tester comprises a single-yarn strength tester used for testing breaking strength, breaking elongation and breaking strength indexes of a single yarn and fiber pure spinning or blended yarn; and the translation mechanism is used for translating a plurality of distributed yarns and carrying out continuous high-efficiency test operation. According to the automatic single-yarn strength tester, a connecting piece is pulled through a tension spring, then a fastening piece and a limiting block are driven to conduct limiting installation on a limiting groove in a rubber pad, the rubber pad can be rapidly replaced after being abraded, the yarn clamping stability is ensured, and the testing accuracy is ensured; the good friction force of the clamping face can be recovered by replacing the rubber pad, it is ensured that the single yarn is tightly fixed in the clamping mechanism, the single yarn cannot move due to unstable clamping in the tensile test process, it is ensured that the test can be conducted smoothly, and the result is accurate.

The invention discloses a bridge beam plate load testing device for road and bridge construction, and belongs to the technical field of bridge beam plate detection. The device comprises the following modules: an intelligent multi-point collaborative loading module for realizing multi-point synchronous dynamic loading of a beam plate so as to simulate various traffic load conditions; the multi-modal sensing and data acquisition module is used for acquiring dynamic response data of the beam slab in an omnibearing manner; the central control module is used for coordinating and managing the work of each module, processing dynamic response data in real time and dynamically optimizing a test strategy; the self-adaptive safety protection module monitors the health state of the beam slab in real time, predicts potential risks and takes active prevention measures; the environmental simulation and compensation module simulates the influence of various environmental conditions on the beam slab and compensates the interference of environmental factors on a test result in real time; the artificial intelligence data analysis module evaluates the performance of the beam slab and predicts the service life of the beam slab; and the augmented reality interaction and visualization module provides a visual user interface and visualizes the test process and result in real time.

The invention discloses a quality detection method for a safety valve spring, and relates to the technical field of spring quality detection, and the method comprises the steps: constructing an appearance detection module, and carrying out the surface defect detection and size verification of a target safety valve spring; performing performance test and performance grade evaluation on the target safety valve spring through a performance detection module; and combining a surface defect detection result, a size verification result and a performance evaluation result to carry out spring quality comprehensive evaluation, and extracting a defective finished product production number according to a quality judgment result to carry out correlation analysis and defective product traceability. The technical problem that an existing safety valve spring quality detection method is low in accuracy and reliability due to the complexity of an application environment and the diversity of performance requirements in the prior art is solved, and the purpose of detecting the quality of the safety valve spring through all-dimensional and multi-angle appearance quality detection and performance attribute detection is achieved. And the accuracy and reliability of quality detection of the safety valve spring are improved.

The invention discloses a metal material welding performance testing device and testing method, and belongs to the technical field of welding testing devices. The metal material welding performance testing device is characterized by comprising a workbench, a fixed clamp is arranged at one end of the workbench, a movable clamp is arranged at the other end of the workbench, and a loading mechanism is arranged between the fixed clamp and the movable clamp; the fixed clamp comprises a fixed seat, the movable clamp comprises a movable seat, and a power structure for driving the movable seat to slide on the supporting table is arranged on the supporting table; clamping mechanisms for clamping a workpiece are arranged on the fixed seat and the movable seat, a vibration structure for applying vibration to the workpiece is arranged in the center of the clamping mechanism on the fixed seat, and the vibration structure is located in the workpiece. By adopting the device and the method for testing the welding performance of the metal material, disclosed by the invention, the problem that an existing testing device cannot be used for testing the tensile property and the compressive property of a welded suspension arm under the condition of multi-load loading can be solved.

The invention discloses an automobile multi-path low-voltage wire harness detection device, and relates to the technical field of automobile wire harnesses, the automobile multi-path low-voltage wire harness detection device comprises a bottom plate and a fixed seat, the fixed seat is fixedly connected to the top of the bottom plate, and the top of the bottom plate is provided with a straightening assembly; through the arrangement of a first copper column and a groove plate, when multiple paths of low-voltage wire harnesses are installed, only a circular ring terminal on one side of the low-voltage wire harnesses needs to be arranged on the first copper column in a sleeving mode, a linear module drives a movable plate to move along the groove plate, and a wire guide wheel on the movable plate brings the low-voltage wire harnesses located outside the groove plate into the groove plate under the rotation effect; two ends of the multi-path low-voltage wire harness do not need to be fixed in sequence; through cooperation of the pin shaft and the second limiting groove, the hook at the tail of the tension meter is hooked into the unfixed circular ring terminal of the low-voltage wire harness in the rising process, and when the tension meter continues to move, the hook and the circular ring terminal are matched to gradually straighten the low-voltage wire harness, so that automatic straightening of the multi-path low-voltage wire harness is achieved, and time and labor are saved.

The invention discloses a wire drawing machine operation state evaluation method and system based on deep learning, and relates to the technical field of intelligent manufacturing, and the method comprises the steps: deploying a multi-source sensor at a preset part of a wire drawing machine, and forming a multi-dimensional operation data flow; the deep learning evaluation model is trained based on the standardized time series data set, model parameters are optimized through a cross entropy loss function, the model learns the characteristic difference between a normal working condition and an abnormal working condition, and the deep learning evaluation model is trained based on the standardized time series data set. And inputting a multi-dimensional operation data flow collected in real time into the trained deep learning evaluation model to generate a dynamic evaluation report. According to the wire drawing machine operation state evaluation method and system based on deep learning provided by the invention, a visual operation state score can be output, detailed fault type probability distribution is given, and intelligent support is provided for equipment maintenance decision.

The invention relates to the technical field of glass fiber detection equipment, and particularly discloses a glass fiber prepared finished product tensile strength detection device which comprises a base, a translation groove is formed in the top end of the base, two traction assemblies are slidably installed in the translation groove, each traction assembly comprises a T-shaped sliding block, and a U-shaped block is arranged at the top end of each T-shaped sliding block. A U-shaped groove is formed in the U-shaped block, a rotating shaft is rotationally installed on the U-shaped block, an upper clamping plate is fixedly installed on the outer wall of the rotating shaft and located in the U-shaped groove in the U-shaped block, and a fixed gear ring is further fixedly installed on the outer wall of the rotating shaft. According to the device, the upper clamping plate is controlled to move, the rotating plate can synchronously push the lower clamping plate and the rotating rod to rotate, the lower clamping plate and the upper clamping plate are attached to each other, glass fiber prepared finished products with different thicknesses are clamped and fixed, and the contact area of the glass fiber prepared finished products is effectively increased through triangular strips on the upper clamping plate and the lower clamping plate; and a glass fiber prepared finished product is stably clamped.

The invention discloses an automatic testing device and method for multi-directional tensile strength of textiles based on constant tension, and relates to the technical field of tensile strength detection.The automatic testing device comprises a rigid rack system, and a high-elastic fabric optical response mechanism is integrated on a double-stand-column portal frame of the rigid rack system; the fiber damage process is reflected through the light transmittance of light to the fabric and the light spot change; the high-elastic fabric optical response mechanism comprises a sealing light insulation assembly, a light source assembly and an imaging assembly. The light source assembly comprises pulse LED light source arrays arranged at equal intervals in the fabric stretching direction, a lampshade and a transverse movement driving unit. The problems that in the prior art, when the tensile strength of a fabric is detected, only the limit value when a sample is completely broken can be recorded, and microcracks generated by step-by-step failure of fibers in the stretching process cannot be captured are solved. The device has the advantages that when the tensile strength of the fabric is detected, the fiber fracture process in the fabric is directly reflected through the change of light spots formed by light penetrating through the fabric, and the like.

The invention belongs to the related technical field of microbiological treatment of soil, and discloses a method for improving microbiological sand consolidation strength based on modified plant fibers. Natural plant fibers are subjected to alkali treatment modification, so that non-cellulose components on the surfaces of the natural plant fibers are removed, the roughness and the specific surface area are remarkably improved, the interface friction force and the mechanical connection capacity between the fibers and sand particles are enhanced, more nucleation sites are provided for microorganisms to induce calcium carbonate precipitation, and the content of calcium carbonate is increased. The strength of the solidified sandy soil can be effectively improved, and the biomineralization period is greatly shortened. Meanwhile, after the modified fibers are doped into the sandy soil, a three-dimensional interlaced fiber network structure can be formed in the material in combination with a microorganism induced calcium carbonate deposition (MICP) technology, and the cohesiveness among sand grains and the mechanical property of the overall structure are effectively improved. According to the solidification method, the solidification strength of the sand column is remarkably improved, the technology is simple, green and environment-friendly, and good engineering adaptability and popularization value are achieved in the field of sand solidification.

The invention discloses a method for testing mechanical properties of a carbon fiber reinforced composite material based on image recognition, and relates to the technical field of material tests.The method comprises the steps that a carbon fiber sample of a fiber laying layer is prepared, the width tolerance is controlled through laser cutting, and speckle patterns are sprayed on the surface; training a U-Net + + neural network based on the collected macro / micro image, and analyzing the dynamic change of the fiber angle in real time; fusing the acquired macro / micro image with the dynamic change of the fiber angle, and constructing a constitutive equation of dynamic fiber orientation distribution; and importing the constitutive equation into a finite element model, iteratively optimizing the fiber-matrix interface strength parameters through inversion calculation, performing blind test verification on the sample by using the optimized finite element model, and outputting a cross-scale correlation test report. According to the method, an interface strength parameter is subjected to inversion iteration optimization through a finite element model, a macro-micro strain field, a fiber slip angle and an interface damage parameter are integrated through a cross-scale correlation test report, and full-chain data support is provided for a composite material structure.