275 results about "Fiber breakage" patented technology

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 relates to the field of carbon fiber composite material mechanics, in particular to a fine evaluation method for the strength of a small-size large or full-opening CFRP (carbon fiber reinforced plastic) shell, which comprises the following steps: establishing a microscopic damage model containing material anisotropy, defining damage variables and evolution equations, uniformly quantifying multi-scale damage behaviors such as fiber fracture, matrix cracking and layered expansion, and evaluating the strength of the small-size large or full-opening CFRP shell. The problem that a traditional single-scale model cannot represent the multiphase coupling effect is solved; through cross-scale transmission of damage variables, whole-process prediction from microscopic damage initiation to macroscopic failure is realized, and the precision of strength evaluation of the complex opening structure is significantly improved. The method realizes refinement, reliability and engineering practicability of strength evaluation of the small-size large-opening or full-opening CFRP shell, is particularly suitable for the fields of aerospace and the like with extremely high requirements on structural weight and safety, and has remarkable technical leading and application value.

The invention relates to the technical field of aromatic polyamide high polymers, in particular to a modified poly-p-phenylene terephthamide fiber with high elongation at break and a preparation method of the modified poly-p-phenylene terephthamide fiber. According to the invention, a small amount of 3, 4-difluorobenzene is introduced According to the preparation method, the third monomer containing 4, 4 '-diaminodiphenyl ether and the fourth monomer containing a diaminophenoxy functional group are added, and the molar ratio of the third monomer and the fourth monomer in the total amount of the diamine monomer is controlled, so that the rigid molecular chain structure of the conventional para-aramid fiber is destroyed to a certain extent, the breaking strength of the fiber is maintained, the elongation at break of the polymer fiber is enhanced, and the service life of the polymer fiber is prolonged. The prepared modified poly-p-phenylene terephthamide can still adopt a dry-jet wet spinning process, the cost of a new production line of a factory is saved, the fiber with stable elongation at break index is obtained by optimizing process conditions and parameters, and the elongation at break of the prepared fiber is 3.6% or above.

The invention discloses an intelligent detection system and method for the fracture specific strength of cotton fibers, and relates to the technical field of cotton fiber detection, and the intelligent detection system for the fracture specific strength of the cotton fibers comprises a sampling module, an image acquisition module, a resistance measurement module, a strength measurement module and a central control module. The sampling module is used for sampling on a cotton fiber sample and constructing the sample into a to-be-detected cotton fiber bundle; the image acquisition module is used for acquiring image information of a to-be-detected cotton fiber bundle; the resistance measurement module is used for measuring resistance information of the to-be-detected cotton fiber bundle; the strength measurement module is used for snapping the to-be-detected cotton fiber bundle from a fracture area of the to-be-detected cotton fiber bundle and recording real-time tension information and displacement information of the fracture area; the central control module is in communication connection with the image acquisition module, the resistance measurement module and the strength measurement module. According to the invention, the detection of the cotton fiber fracture specific strength in a non-standard laboratory environment can be realized.

The invention relates to the technical field of fibers, and discloses a preparation method of antibacterial modified fibers for textile fabrics, nylon 6 and copper-tea polyphenol-based hyperbranched polyamide are added into formic acid, the mixture is stirred and then spun by an electrostatic spinning machine, and the antibacterial modified fibers for the textile fabrics are obtained. The hyperbranched polyamide has good compatibility with nylon 6, contains a three-dimensional dendritic hyperbranched molecular chain, has a good toughening effect on nylon 6 fibers, and enables the fibers to maintain good breaking strength while improving the elongation at break of the fibers. The copper-tea polyphenol-based hyperbranched polyamide contains tea polyphenol active antibacterial substances and antibacterial copper ions, so that the antibacterial performance of the fiber is remarkably improved. Meanwhile, the copper ions, the tea polyphenol and the catechol-based hyperbranched polyamide form a tight and firm coordination effect, and the copper ions and the tea polyphenol are also difficult to elute from a fiber matrix, so that the fiber still keeps excellent antibacterial performance.

The utility model discloses a carbon fiber prepreg cloth yarn spreading device which comprises installation frames, a yarn inlet and yarn spreading rollers, a plurality of yarn spreading rollers are installed between the installation frames, ultrasonic vibrators used for controlling the yarn spreading rollers are installed outside the installation frames, the number of the ultrasonic vibrators is the same as that of the yarn spreading rollers, and the number of the yarn spreading rollers is larger than that of the installation frames. A cleaning plate is mounted in the mounting frame, the cleaning plate is arranged below one yarn spreading roller in a sleeving manner, and the cleaning plate is located below the yarn inlet; according to the scheme, through the synergistic effect of the cleaning brush and the cleaning plate, presoaking liquid residues on the surface of the yarn spreading roller can be cleaned in the yarn spreading process, the presoaking liquid residues are prevented from being attached to the surface of the yarn spreading roller, and therefore the yarn spreading quality of the carbon fiber prepreg cloth is improved; and the problems of non-uniform stretching, fiber breakage and the like of the carbon fiber prepreg cloth caused by the residue of the prepreg liquid are avoided.

The utility model relates to the technical field of injection molds, in particular to a dipping mold for a fiber reinforced composite material, which comprises a first mold plate, a second mold plate and a forming cavity arranged between the first mold plate and the second mold plate, the forming cavity comprises a feed port, a plurality of mold cavities and a discharge port, fibers enter from the feeding port, bypass the impregnation module and are discharged from the discharging port, the forming cavity is further communicated with a feeding port used for feeding resin melt, and the impregnation module which rotates to adjust tension is arranged in the mold cavity. According to the dipping mold for the fiber reinforced composite material, the dipping module in each mold cavity can rotate to adjust the tension applied to the fiber in the mold cavity, so that the poor dipping effect caused by too small tension and too small contact area of the fiber and a resin melt is avoided, and meanwhile, the fiber breakage caused by too large tension is avoided; therefore, the product impregnation effect is effectively improved.

Employing methodologies and systems to detect damage initiation and growth inside a composite material (matrix cracking, delamination, fiber break, fiber pullout, etc.) wherein damage produces high-frequency acoustic emission (AE) waves that are transported to recording sensors along with relatively lower frequency waves representing the flexural deformation of the impacted composite structure.

The invention discloses a modified heterocyclic aramid fiber and a preparation method thereof, and belongs to the technical field of high-performance organic fibers. The invention discloses a preparation method of a modified heterocyclic aramid fiber, which comprises the following steps: by taking 2-(4-aminophenyl)-5-aminobenzimidazole, p-phenylenediamine, isophthaloyl chloride and paraphthaloyl chloride as raw materials and LiCl as a catalyst, carrying out polymerization reaction in a solvent to obtain a polymer, and then spinning to obtain the modified heterocyclic aramid fiber. The invention also discloses the modified heterocyclic aramid fiber prepared by the method. According to the invention, m-phthaloyl chloride is creatively used for replacing a part of paraphthaloyl chloride and is subjected to nucleophilic reaction with 2-(4-aminophenyl)-5-aminobenzimidazole and p-phenylenediamine, so that the elongation at break of the fiber can be greatly improved under the condition that the breaking strength and other weather resistance of the original fiber are basically unchanged.

The present invention belongs to the technical field of the preparation of bio-based functional fibers, and relates to a preparation method of highly shrinkable polyethylene furandicarboxylate fibers. Preparation method: The polyethylene furandicarboxylate chips are dried and then melt-blended and spun to obtain highly shrinkable polyethylene furandicarboxylate fibers. The linear density of the fibers is 2.22 - 4.44 dtex, and the linear density deviation rate is -5% - 5%. The breaking strength of the fibers is 3.5 - 4.5 cN / dtex, the breaking elongation rate is 53.5 - 68.5%, the content of ultra-long fibers is 0 - 3 mg / 100 g, the content of defects is 3 - 20 mg / 100 g, the number of crimps is 12 - 15 per 25 mm, the crimp rate is 14% - 18%, and the boiling water shrinkage rate is 60 - 80%. The highly shrinkable polyethylene furandicarboxylate fibers prepared by the present invention are 100% highly shrinkable polyester fibers, and the fiber properties far exceed those of conventional highly shrinkable fibers, and can become an alternative product to PET.

The invention relates to the field of a characterization method of a damage mechanism of a carbon fiber composite material, in particular to a characterization method of a microscomic damage mechanism of a small-size large or full-opening CFRP (Carbon Fiber Reinforced Plastics) shell, which comprises the following steps of: systematically researching initiation positions, expansion paths and interaction mechanisms of fiber fracture, matrix cracking and interface debonding in an opening area; determining the influence of multi-axial stress, dynamic load and temperature gradient on damage distribution and expansion rate; secondly, establishing cross-scale quantitative correlation; through multi-modal experimental data, a quantitative relation between microscopic damage parameters and macroscopic mechanical properties is constructed, and accurate mapping from material microscopic behaviors to structure macroscopic responses is achieved; and finally, constructing a damage high-precision characterization method. A damage model taking layer design, machining precision and environmental load into consideration is developed, the problems that a multi-damage coupling mechanism is not clear and cross-scale modeling depends on experience are solved, and theoretical support is provided for shell anti-damage design.

The invention discloses a cashmere fiber length measurement method and system based on a convolutional neural network, and a medium, and belongs to the technical field of cashmere fiber detection, and the cashmere fiber length measurement system based on the convolutional neural network comprises an obtaining and processing module which obtains and processes an actual to-be-detected cashmere fiber sample image; the calculation module is used for calculating the average fiber length of the actual cashmere fiber sample to be detected by using the fiber fracture repair model and the fiber cross detection model; the display module is used for displaying, outputting and calculating the average fiber length of the actual to-be-detected cashmere fiber sample. The method can detect the average length of cashmere fibers.

The invention discloses an chemi-mechanical pulp production method capable of improving the filtration property of chemi-mechanical pulp, and relates to the technical field of papermaking, high-concentration grinding freeness is optimized to 640 + / -30ml, pulp fine fibers can be controlled at 22%-33%, the tensile index middle-lower limit and the bulk middle-upper limit, the high-concentration grinding effect is improved, the effect between fibers is facilitated, the effect between the fibers and a grinding sheet is reduced, and the filtration property of the chemi-mechanical pulp is improved. Fiber cutting is reduced, and the content of pulp fine fibers is reduced; the MSD torque is increased to 250 + / -10 KNM, the tearing effect of wood chips is improved, the preimpregnation reaction of the wood chips is facilitated, the original fine content is controlled to 26%-29% from original 22%-33%, the pulp bulk is increased by about 0.1 cm < 3 > / g, and the tensile index is increased by 1.0 N.m / g; the four low-concentration grinders are changed into parallel connection, so that the residence time of pulp in the low-concentration grinders is prolonged, the cutting effect of the pulp ground by the low-concentration grinders on fibers is reduced, light friction between grinding sheets and the fibers is increased, fibrillation of the fibers is facilitated, the bulk and the tensile strength are improved to a certain extent, and under the content of fine fibers, the size of the fibers is reduced. And the bulkiness and the tensile index of the finished pulp are also improved to a certain extent.

The invention discloses a high-toughness anti-ultraviolet PET (Polyethylene Terephthalate) fiber and a preparation method thereof, belongs to the technical field of polyester fibers, and is used for solving the technical problem that the mechanical strength, the ultraviolet resistance and the moisture absorption and quick drying performance of the PET fiber in the prior art need to be further improved. The invention relates to a high-toughness anti-ultraviolet PET (Polyethylene Terephthalate) fiber which is prepared from modified PET, modified polyester, modified montmorillonite, epoxy modified polysiloxane and an additive in a weight ratio of (55-60): (30-35): (10-16): (20-30): (3-5), according to the invention, the modified montmorillonite is used as a heterogeneous nucleation point, and a PET molecular chain composed of the modified PET, the modified polyester and the epoxy modified polysiloxane is induced to be arranged in a height orientation manner along the drafting direction, so that the breaking strength of the PET fiber is improved, a relatively high elongation at break is maintained, and the anti-ultraviolet effect and the moisture-absorbing and quick-drying performance of the PET fiber are improved.

The invention relates to a melt impregnation device and method for a continuous fiber reinforced thermoplastic composite material, and belongs to the technical field of composite material forming. A lower die dipping tank in the device is provided with a fiber inlet and a prepreg outlet, a plurality of variable-diameter dipping rollers are arranged between the fiber inlet and the prepreg outlet, the two ends of each variable-diameter dipping roller are a large-diameter end and a small-diameter end respectively, the large-diameter ends and the small-diameter ends are connected through smooth roller surfaces, and the small-diameter ends of the adjacent variable-diameter dipping rollers face opposite directions; the mold cover plate covers the lower mold dipping tank, the upper mold cover plate is provided with a plurality of downward supporting blocks, the supporting blocks are located between the adjacent variable-diameter dipping rollers, and the lowest points of the supporting blocks are lower than the highest points of the small-diameter ends of the variable-diameter dipping rollers. Through the variable-diameter design of the variable-diameter dipping roller, the supporting blocks and the fiber guide columns are matched, the unfolding effect of fibers is maintained and improved, the problems of fiber breakage, gathering and twisting are effectively solved, and high-quality output of prepreg is ensured.

The present invention relates to an ABS composite material and a preparation method thereof, belonging to the technical field of polymer materials. The present invention is obtained by modifying ABS and simultaneously blending it with sisal fiber, carbon fiber, long glass fiber, and copolymerized polypropylene; in the present invention, sisal fiber, carbon fiber, long glass fiber, and copolymerized polypropylene are blended with modified ABS powder, increasing the stiffness and strength of the ABS composite material; through fiber fracture, fiber pull-out, and the expansion of matrix cracks, the impact toughness of the ABS material is enhanced, achieving the effect of dissipating impact energy, and also improving the durability and lifespan of ABS products; ABS is modified to form modified ABS powder, improving the bonding force between modifier particles and fibers, enabling the ABS composite material to have good toughness, with significant improvement in mechanical properties. At the same time, the toughness, stiffness, and hardness of the products made of ABS are also improved.

The utility model provides a yarn guide device for pultrusion process, which comprises a plurality of layers of creels, the top of each layer of creel is detachably provided with a plurality of yarn guide plates along the X-axis direction, the yarn guide plates are provided with yarn threading holes side by side along the Y-axis direction, and the yarn threading holes are arranged in the X-axis direction. Yarn threading holes are formed in the yarn guide plates, the yarn threading holes in the yarn guide plates are sequentially increased progressively according to the number difference value of the yarn threading holes in the two adjacent yarn guide plates, the yarn guide device further comprises a fixing assembly used for assembling all the yarn guide plates into a whole in an attached mode, and when the yarn guide plates are assembled into the whole in an attached mode, the corresponding yarn threading holes in the yarn guide plates are coaxially formed and coincide. During yarn threading, the yarn guide plates are taken down and are tightly fixed together through the fixing assemblies, so that the corresponding yarn threading holes in all the yarn guide plates coincide, yarn bundles of yarn bundle rolls can conveniently penetrate through the corresponding yarn threading holes in the yarn guide plates at a time, rapid and accurate yarn threading of the yarn bundles can be achieved, a large amount of manpower is saved, yarn bundle crossing and fiber scratching and fuzzing during yarn threading are avoided, and the yarn threading efficiency is improved. And even the fiber is snapped.

The invention relates to the technical field of fiber performance test and evaluation, in particular to a method for rapidly measuring the fiber breakage rate of a fiber bundle by combining a computer and amplification equipment. The invention provides a rapid detection method of a fiber end breakage rate. The detection method comprises the following steps: S1, preparing a sample; s2, obtaining a fiber cross section; s3, automatically identifying the image; and S4, calculating the fiber end breakage rate. According to the method, a laser confocal microscope is adopted to amplify the fiber cross section and continuously photograph the fiber cross section for multiple times, computer image analysis software is adopted to automatically identify and integrate the obtained whole bundle of fiber cross sections, overlapping areas among photos are removed, and the complete and accurate fiber cross section is obtained. Metallographic software is adopted to identify and mark the cellosilk, so that the rapid and accurate measurement of the cellosilk is realized.

The invention provides a modified engineering plastic melt index real-time monitoring method which comprises the following steps: determining a melt index difference value of adjacent monitoring points by acquiring a melt index value of each section of an extrusion production line; obtaining the number of shearing cycles of the extrusion production line, identifying the fiber shearing damage degree of each section according to the melt index difference and the number of shearing cycles to obtain fiber damage distribution, and determining the fiber fracture position according to the fiber damage distribution; the melt index difference value corresponding to the fiber fracture position is analyzed by obtaining the melt index of the fiber fracture position, and the monitoring point interval is dynamically adjusted through the melt index difference value; and obtaining the melt index value and the fiber shortening amplitude after the interval adjustment of the monitoring points, and comparing the melt index change and the fiber length loss of each monitoring point to obtain the corresponding distribution of the fiber shortening amplitude and the melt index value.

The utility model provides a broken optical fiber collecting device, and belongs to the technical field of optical fiber collecting devices. The device comprises a wire arranging wheel; the pressing wheel set comprises a movable traction wheel and a driving traction wheel, the movable traction wheel is close to the driving traction wheel when fiber breakage occurs at the downstream of the pressing wheel set, and the driving traction wheel rotates; the fiber pressing mechanism is used for pressing the target section of the optical fiber at the first position to a target position when the optical fiber is broken; the temporary take-up reel is arranged at the upstream of the fiber pressing mechanism and is configured to rotatably collect the optical fibers; the clamp is fixed at the temporary take-up reel and is used for clamping the target section of the optical fiber when the target section of the optical fiber is pressed down to a target position; and the cutting piece is located at a second position between the clamp and the pressing wheel set, and the cutting piece is used for cutting off the target section of optical fiber at the second position. The broken optical fiber collecting device provided by the utility model can avoid the problems of optical fiber waste, low collecting efficiency and high labor cost during fiber breaking.

The invention discloses a dry hot rock reservoir horizontal well fracturing fiber breakage early warning method based on DAS monitoring, which comprises the following steps: firstly, collecting a vibration signal in a shaft through a DAS (Distributed Acoustic Wave Sensing) system, and carrying out wavelet threshold denoising, data segmentation and normalization processing to obtain preprocessed signal data; secondly, performing time-frequency analysis on the signal by adopting a short-time Fourier transform analysis method so as to identify energy distribution of different frequency bands and visualize a high-energy region, thereby identifying an abnormal broadband; then, phase wrapping detection is carried out, whether the signals exceed a dynamic range or not is verified, and the strain rate and histogram features of the phase signals are calculated; and finally, the standard deviation of the strain rate is evaluated through normal distribution modeling and maximum likelihood estimation, and once the standard deviation exceeds a set threshold value, fiber breakage risk early warning information is sent out. According to the method, the signal processing technology and the statistical analysis technology are effectively integrated, the safety of fracturing operation is improved, and meanwhile reliable technical support is provided for efficient development of the hot dry rock reservoir.

The invention discloses a continuous fiber reinforced three-dimensional woven composite bulletproof helmet and a preparation method thereof. The method comprises the following steps: firstly, designing an axial lining yarn organization structure with a stable structure; carrying out three-dimensional surveying and mapping on a helmet mold, and carrying out one-time forming knitting on the bulletproof helmet preform through flat knitting local knitting and a holding ring type needle retracting and releasing knitting method according to the three-dimensional hyperboloid structure of the helmet by adopting the axial lining yarn tissue structure; and then carrying out compression molding by adopting a resin film permeation process to prepare the continuous fiber reinforced composite bulletproof helmet. The bulletproof helmet made of the three-dimensional woven composite material is compact in structure, free of layering, uniform in overall thickness, free of lap joint and reinforcement of a main body material, continuous in fiber distribution, free of buckling, uniform in quality, high in material utilization rate and stable in performance, and meets the protection requirement. The defects that a traditional bulletproof helmet is tedious in process, low in production efficiency, high in processing cost, low in material utilization rate, discontinuous in fiber fracture, poor in manual layering and size stability and the like are overcome.

The invention relates to the field of material detection, and discloses a tensile strength detection device and process for production quality inspection of a new material medical tourniquet. Which comprises a controller, a machine frame, a vertical screw rod transmission mechanism fixed on the machine frame, a lower clamping device driven by the vertical screw rod transmission mechanism to ascend and descend, and an upper clamping device located over the lower clamping device and fixed relative to the machine frame, and is characterized by further comprising a follow-up shielding mechanism and a damage recognition mechanism; the follow-up shielding mechanism comprises a left shielding plate and a right shielding plate, and the left shielding plate and the right shielding plate cover the top exposed area of the vertical lead screw transmission mechanism. The damage identification mechanism generates a trigger signal when fiber fracture or local damage occurs to the sample, the damage identification mechanism is electrically connected with the controller, and the controller is electrically connected with a driving motor of the vertical lead screw transmission mechanism. According to the invention, fiber damage caused by defects of the sample during initial detection can be identified, so that the problems of invalid detection and fiber scattering are reduced.

The present application relates to the technical field of cotton fiber detection. A kind of intelligent beam fiber strength tester, including cabinet, industrial computer, sliding table module is provided in cabinet, sectional material frame, air cylinder, beam fiber clamping mechanism, stepper motor, lever type pull rod, force sensor, displacement sensor, resistance detection plate, A / D acquisition conversion module;The application method of the tester, steps include: under normal environmental conditions, beam fiber clamping mechanism clamps fiber sample, obtains moisture regain R by resistance moisture regain conversion program conversion;Stepper motor drives lever type pull rod to stretch sample, data is made into the tensile curve F (e) of beam fiber sample-e by industrial computer, and machine learning model predicts the corrected breaking strength value and elongation rate.The present application is simple and reasonable in structure, can realize the quick and accurate measurement of cotton beam fiber breaking strength value and breaking elongation rate under different humidity conditions in normal environment, is high in informatization degree, economic and practical, and improves the accuracy of test result.

The utility model discloses an antibacterial flax blended yarn which comprises flax fibers, first blended fibers are wound on one sides of the flax fibers, second blended fibers are wound on one sides of the first blended fibers, and third blended fibers are wound on one sides of the second blended fibers. According to the linen blended yarn, the second blended fiber and the third blended fiber are added to the linen blended yarn, the second blended fiber is the cotton fiber, the cotton fiber can improve the hygroscopicity and air permeability of the yarn and reduce the dryness and vulnerability of the yarn, and therefore the anti-fracture performance is improved, and the third blended fiber is the polyester fiber. According to the flax blended yarn, the polyester fibers have high elongation at break and evenness, the spinnability and breaking strength of the blended yarn can be improved, meanwhile, the whole flax blended yarn is formed by weaving various fibers in a crossed mode to be in a twisted shape, force borne by the yarn is evenly dispersed, the possibility of fiber breakage is reduced, and therefore the purpose that the flax blended yarn can be prevented from being broken is achieved.

The utility model discloses a rotary tensile test structure for washing-resistant terylene grey cloth, and relates to the technical field of tensile test of terylene grey cloth. The rotary tensile test structure comprises a bottom plate, a PLC (programmable logic controller) and a touch screen are fixedly mounted above the bottom plate, and a stretching mechanism for stretching the grey cloth and a fixing mechanism for fixing two ends of a grey cloth sample are mounted above the bottom plate. The stretching mechanism comprises sliding rails fixed to the left side and the right side of a bottom plate, the rotating speed of a winding motor and the retraction rate of a stretching piston are coordinated through a PLC so that the winding tightness can be guaranteed, a ratchet wheel at one end of a limiting pipe can prevent the limiting pipe from rotating under the limitation of a pawl, the stretching piston stretches after winding is completed, and a gray fabric sample is stretched. According to the mode, the pressing plate in the limiting pipe only plays a temporary fixing role, the stress contact surface is enlarged through multi-layer wrapping, the unit area pressure is reduced, and therefore the risk of local indentation or fiber breakage is reduced.

The application discloses a constant-tension-based textile multidirectional tensile strength automatic testing device and method, relates to the tensile strength detection technical field, and comprises a rigid frame system; a high-elastic fabric optical response mechanism is integrated on a double-column portal frame of the rigid frame system and is used for reacting fiber damage processes through light transmittance and light spot change of the fabric; the high-elastic fabric optical response mechanism comprises a sealed light isolation component, a light source component and an imaging component; the light source component comprises a pulse LED light source array, a lampshade and a horizontal movement driving unit which are equidistantly arranged along a fabric stretching direction. The application improves the prior art which can only record the limit value when a sample is completely broken and cannot capture microcracks generated by fiber step-by-step failure in a stretching process when the fabric tensile strength is detected. The application has the advantages that the fiber breaking process in the fabric can be directly reflected through light spot change formed by light penetration of the fabric when the fabric tensile strength is detected.

The invention discloses a method for evaluating the residual strength of a multi-scale fiber-reinforced flexible pipe under a stretch-bending load, and relates to the technical field of structural strength evaluation of ocean engineering composite materials, and the method comprises the following steps: extracting fiber distribution characteristics by adopting digital image processing based on a scanning electron microscope image; a Monte Carlo method is combined to construct a two-dimensional RVE geometric model of the fiber reinforced structure containing the damp-heat degradation, and macroscopic elastic parameters are predicted; a VUMAT user material subprogram containing dynamic damage is written based on Fortran, damage starting and evolution failure criteria of a fiber reinforced structure are embedded, and the nonlinear coupling evolution process of multiple damage modes such as fiber fracture, matrix cracking and interface debonding is simulated. According to the method, a material-damage-response multi-scale analysis framework is constructed by coupling microscopic material components, a microscopic damage model and macroscopic pipeline structure analysis, the problem that a traditional method lacks multi-scale damage coupling analysis under a complex load is solved, and the residual strength evaluation precision of the pipeline under the action of a stretching-bending combined load is improved.

This invention belongs to the field of graphene fiber processing technology, and relates to a two-step sizing process for graphene fibers. The sizing agent used in the first sizing step is denoted as sizing agent A, and the sizing agent used in the second sizing step is denoted as sizing agent B. Sizing agent A comprises a cationic polyether polyurethane slurry, a volatile ester co-solvent, and water; sizing agent B comprises a cationic polyether polyurethane slurry, a lubricant, and water. The lubricant is one or more of the following: polyether-modified polydimethylsiloxane, polyether-modified heptamethyltrisiloxane, oxidized polyethylene wax emulsion, polytetrafluoroethylene emulsion, and polyethylene glycol monooleate. After sizing, a polyurethane film layer forms on the fiber surface, which can absorb and disperse stress, improve bundle strength, bending performance, and abrasion resistance, solve the problems of fiber breakage and flyaways, and simultaneously fill the gaps between fibers, improving electrical and thermal conductivity to meet the requirements of high-speed weaving processing.

The present invention discloses Trichoderma asperellum ZC3 and its application in the degradation of Zanthoxylum bungeanum branches. This strain has a fast growth rate and strong degradation ability. In a liquid filter paper strip culture medium, after culturing at 28 °C for 7 days, the filter paper strip completely disintegrates; in a solid culture medium of Zanthoxylum bungeanum branch powder, after culturing at 28 °C for 40 days, its lignin degradation rate for Zanthoxylum bungeanum branches reaches 78.11%, and the degradation rates of cellulose and hemicellulose reach 82.58% and 75.84% respectively. Under a scanning electron microscope, obvious fiber breakage and structural disintegration phenomena can be seen in the Zanthoxylum bungeanum branches, showing a high degradation ability. In addition, the lignin-degrading bacterium ZC3 has good tolerance to the leaching solution of Zanthoxylum bungeanum branches.