149 results about "Bending fatigue" patented technology

The invention discloses a gear pair life prediction method based on dynamic stress, belongs to the technical field of reliability design of mechanical transmission systems, and aims to solve the problem of inaccurate life prediction caused by neglecting a dynamic effect and a real surface topography in an existing gear design method. The method comprises the following steps: firstly, acquiring gear pair interface mechanical property parameters considering shafting vibration, dynamic load and surface roughness, wherein the parameters comprise transient oil film pressure, friction coefficient, oil film thickness and shear stress; solving a three-dimensional subsurface stress field by adopting an algorithm and calculating von Mises equivalent stress distribution; stress volume integration is conducted on different rough surfaces, the honed surface is used as the reference, the relative fatigue life of other surfaces is calculated based on the Zaretsky life prediction theory, and accurate prediction and process optimization of the contact fatigue life are achieved; meanwhile, the dynamic bending stress of the tooth root is calculated based on the dynamic normal load, and the bending fatigue safety coefficient is checked.

To provide a component that enables suppression of strength degradation in an excess carburized portion, including degradation of impact resistance and bending fatigue characteristics.SOLUTION: A vacuum carburizing steel containing, in mass%, C: 0.15-0.30%, Si: 0.70-1.20%, Mn: 0.90-3.00%, Cr: 0.50-1.50%, Mo: 0.10-1.00%, Al: 0.020-0.050%, Nb: 0.020-0.100%, and N: 0.0100-0.0300%, the balance being Fe and unavoidable impurities, wherein P and S among the unavoidable impurities satisfy P: 0.030% or less and S: 0.030% or less, and formulas A, B, C, and D: A: 0.12≤3[Al]+4[Nb]≤0.50, B: 0.20≤[N] / [Al]≤0.80, C: 5.0≤3[Si] / 0.5[Cr], D: 1.95≤-2[Si]+3[Mn]+[Cr]+2[Mo], are all satisfied.SELECTED DRAWING: Figure 1

The invention relates to the technical field of flexible connecting pipelines, and discloses an asymmetric net sleeve metal hose and a forming method thereof.The asymmetric net sleeve metal hose comprises a corrugated pipe, the two ends of the corrugated pipe are fixedly connected with connecting pipes correspondingly, the outer side of the corrugated pipe is wrapped with a woven net sleeve, and the two ends of the woven net sleeve are fixedly connected with connecting rings correspondingly; the connecting ring is fixedly connected with the connecting pipe, and the woven mesh sleeve is of an unbalanced woven structure. The bending fatigue life of the metal hose is prolonged, the minimum bending radius is reduced, the self-supporting capacity of the metal hose in the specific direction is improved, and the application range of the metal hose is expanded.

The invention discloses a method for improving the rotating bending fatigue strength of an AlCoCrFeNi 2.1 eutectic high-entropy alloy, and belongs to the technical field of alloys. According to the method, the AlCoCrFeNi 2.1 eutectic high-entropy alloy is treated by utilizing an ultrasonic surface rolling process (USRP), so that the density of surface defects and holes of the AlCoCrFeNi 2.1 eutectic high-entropy alloy is effectively reduced, and the rotating bending fatigue strength of the AlCoCrFeNi 2.1 eutectic high-entropy alloy is improved. And meanwhile, the surface roughness is reduced, the surface structure morphology is changed, the crack propagation path is prolonged, and finally the purpose of improving the fatigue performance of the AlCoCrFeNi 2.1 eutectic high-entropy alloy is achieved. According to the method, the surface structure of the AlCoCrFeNi 2.1 eutectic high-entropy alloy can generate residual compressive stress under the action of high-frequency vibration and static-load rolling of the USRP, so that the initiation time of fatigue cracks is effectively prolonged, and the fatigue performance of the AlCoCrFeNi 2.1 eutectic high-entropy alloy is enhanced.

The invention discloses an intelligent vehicle roller steel wire rope bending fatigue test method and device, the device comprises a packaging plate, a steel wire rope clamping assembly arranged on the packaging plate, and a shooting assembly arranged on the opposite surface of the packaging plate, and the steel wire rope clamping assembly is used for abutting against the center point of the steel wire rope so as to keep the center point of the steel wire rope unchanged; steel wire rope bending driving assemblies are arranged above and below the steel wire rope clamping assemblies on a back plate of the container plate and used for fixing the upper end and the lower end of a steel wire rope and driving the upper end and the lower end of the steel wire rope to swing with the center point of the steel wire rope as the circle center. The shooting assembly is used for shooting images of the central point of the steel wire rope when the upper and lower ends of the steel wire rope swing around the central point of the steel wire rope; the shooting assembly is connected with a processing system; the processing system tests the bending fatigue of the steel wire rope based on the image change of the central point of the steel wire rope; according to the invention, the image change of the central point of the steel wire rope can be quickly and accurately identified.

This invention relates to a 1900MPa grade ultra-high strength and toughness stainless gear steel and its preparation method. The chemical composition of the 1900MPa grade ultra-high strength and toughness stainless gear steel, by mass percentage, is: C 0.08-0.11%, Cr 10-12%, Ni 2-4%, Mo 2-5%, Co 10-13%, V 0.2-0.6%, Nb 0.02-0.05%, Al 0.5-1.0%, with the balance being Fe and unavoidable impurities. Its composition design must meet the following requirements: Chromium equivalent Cr... eq It is 17~18, with a nickel equivalent (Ni). eq The martensitic transformation point is 14-15. s The temperature range is 240~280℃. Its beneficial effects are: strengthening through the composite precipitation of intermetallic compounds NiAl and M₂C carbides, combined with Cr... eq Ni eq M s A synergistic design incorporating 5%–10% metastable austenite achieves an excellent balance between strength and toughness. The resulting steel exhibits tensile strength ≥1900 MPa, yield strength ≥1550 MPa, elongation ≥13%, fracture toughness ≥80 MPa·m¹ / ², and bending fatigue limit reaching 920 MPa. It is particularly suitable for manufacturing critical structural components requiring high load-bearing capacity and high reliability, such as aircraft engines, and has broad application prospects.

The application provides a low-torque steel wire rope with a twist pitch, which improves the bending fatigue performance of the manufactured steel wire rope by setting a composite core, and effectively improves the radial support stiffness and the anti-torsion performance of the composite core by the radial constraint and the shaping support of the fiber core formed by the thermosetting resin layer. Meanwhile, the inner layer strand and the outer layer strand with opposite twist pitches are sequentially arranged outside the composite core, and the filling strand and the filling steel wire are arranged in the gap between the inner layer strand and the outer layer strand, which significantly improves the tensile strength and the anti-torsion performance of the steel wire rope, improves the structural compactness and the support of the whole steel wire rope, makes the stress of the steel wire rope more balanced during use, and avoids the structural damage caused by local stress concentration. Finally, by setting the twist pitches of the first steel wire, the inner layer strand and the outer layer strand, the manufactured steel wire rope has good low-torsion performance and bending fatigue performance, and has structural stability and a long service life, which can meet the long-term use requirements in multiple scenes such as hoisting and traction.

The application discloses a prediction method for the relationship between welding repair defects and fatigue life of TC17 titanium alloy blades, and comprises the following steps: step one, establishing a fatigue life prediction model related to repair defects; step two, preparing a rotary bending fatigue sample; step three, heat treating a surfacing sample; step four, processing the rotary bending fatigue sample; step five, testing the rotary bending fatigue; step six, analyzing a fracture and counting defects; and step seven, establishing a rotary bending fatigue life prediction model. The application selects an electric arc welding wire repair test block, tests the rotary bending fatigue performance of the test block, observes and counts the defect morphology, size and position of the fracture, analyzes the corresponding relationship between the defects and the fatigue life, establishes a fatigue life prediction model related to the repair defects, and determines the influence of the pore defects on the fatigue life of the repaired blade through the model.

The invention discloses a method for evaluating the low-temperature fatigue performance of an asphalt mixture, belongs to the technical field of road engineering, and aims to solve the technical problem of how to more accurately and comprehensively evaluate the fatigue performance of the asphalt mixture in a low-temperature environment. According to the technical scheme, the method comprises the following steps: preparing a prismoid test piece and a beam test piece made of the same asphalt mixture as the prismoid test piece; acquiring a temperature change sequence of the pavement structure in the target test environment for a plurality of continuous hours through temperature acquisition equipment; taking the collected temperature change sequence as an environment control condition, carrying out a constraint test piece temperature stress test on the prismoid test piece, and synchronously recording the axial force per hour in the test process; calculating the average temperature stress value in the test period according to the axial force per hour and the size of the prism test piece; the average temperature stress value serves as the initial stress level of the four-point bending fatigue life test and is pre-loaded on the beam test piece, and a plurality of different load stress levels are selected for testing.

A blended rope is provided having an outer sheath (8) enclosing at least a strength member (7), the strength member (7) having high-strength synthetic fibers, the strength member (7) being a blended strength member (7) formed with a combination of ARAMID fibers and HMPE fibers, the blended strength member comprising a non-homogeneous distribution of the ARAMID and HMPE fibers, wherein the weight ratio of ARAMID to HMPE in the strength member (7) is preferably a minimum of 80:20.

The invention belongs to the field of endoscope testing, and provides an endoscope bending fatigue testing device and method.The endoscope bending fatigue testing device comprises a detection table, a plurality of lifting blocks are vertically installed on the detection table in a sliding mode, the lifting blocks are distributed at equal intervals, every two adjacent lifting blocks are distributed in a staggered mode, each lifting block is provided with a containing groove, and the containing grooves are communicated with the detection table. A lower limiting rod and an upper limiting mechanism are fixedly mounted in the placement groove, and the upper limiting mechanism is used for limiting the endoscope; a driving mechanism is fixedly mounted at the bottom of the detection table, and a plurality of output ends of the driving mechanism are respectively connected with the plurality of lifting blocks through connecting assemblies. According to the endoscope testing device, the elastic clamping mechanism is arranged, the elastic clamping mechanism can fix the end of the endoscope, compensate the horizontal length of the endoscope in the bending process and drive the endoscope to rotate in the moving process of the endoscope, so that the same part of the endoscope is tested in different directions, and the testing result is more accurate.

A wave-shaped web I-beam front axle, including I-beam and the front axle body arranged at both ends of the I-beam, the front axle body extends obliquely outward and is provided with a front axle pipe, the I-beam includes horizontal upper web and lower web, the upper web and the lower web are fixedly connected by vertical middle web, so that the upper web, the middle web and the lower web form the I-beam with I-shaped cross section, and the horizontal section of the middle web is wave-shaped.The utility model discloses more reasonable structure design, through reducing the thickness of the upper web of the I-beam, the width of the upper web and the lower web of the I-beam and the thickness of the middle web, the relative circular pipe beam cross section area reduces 29.5%, realizes that the I-beam front axle reduces 12.5% in weight, in addition, the cross section height of the I-beam is higher than that of the circular pipe beam, improves the bending fatigue strength of the front axle, the middle web is designed into wave-shaped, improves the bending deformation stiffness of the front axle, namely, in the whole weight reduction, the bending resistance of the front axle can be improved.

The invention relates to the technical field of flexure performance testing, in particular to a tensile and flexure-resistant performance testing device for an insulated cable. Comprising a base; the controller is mounted on the side surface of the base; the movable seat is connected to the base in a sliding manner; the rotating disc is rotationally connected to the moving seat; the air pump is mounted on the side surface of the movable seat; the fixed plates are symmetrically connected to the side surface of the rotating disc; and the fixed cylinders are symmetrically connected to the fixed plate, the fixed cylinders penetrate through the side face of the rotating disc, and through holes are formed in the fixed cylinders. Through the cooperation of the air pump, the fixed cylinder and the roller, an air diaphragm can be formed between the cable body and the roller, so that the cable can realize non-contact sliding with the roller during a deflection test, specifically, the air pump conveys compressed air to the fixed cylinder through the shunt pipe, and the compressed air is sprayed out through the through hole and the air outlet pipe, so that a dynamic air cushion can be formed; unexpected tensile load and surface abrasion caused by traditional roller friction can be avoided, and it is ensured that the test result only reflects the real bending fatigue performance of the cable.

The invention discloses a treatment process for improving the three-point bending fatigue limit of a thin-wall titanium alloy test piece, and relates to the field of metal material processing for improving the anti-fatigue performance, and the treatment process comprises the following steps: pretreating a TC4 titanium alloy sheet to obtain a test piece; processing the test piece by using ultrafast laser shock peening; setting a load, and respectively carrying out three-point fatigue tests on the test piece before and after strengthening; and calculating the bending fatigue limit of the test piece before and after strengthening, and carrying out strengthening mechanism analysis and comparison. According to the method, a thin-wall TC4 titanium alloy three-point bending test piece can be subjected to impact strengthening by optimizing the combination of femtosecond laser energy and impact times, a gradient structure and residual compressive stress are introduced to a surface layer by utilizing high-strain-rate plastic deformation induced by ultrafast laser, fatigue crack initiation is inhibited, meanwhile, expansion of a heat affected zone and deformation of the test piece are avoided, and the impact strength of the thin-wall TC4 titanium alloy three-point bending test piece is improved. Therefore, the bending fatigue performance is improved.

The invention discloses an anti-bending fatigue cable and a preparation method thereof, and relates to the technical field of cables, the anti-bending fatigue cable comprises a first cable main body and a second cable main body, the first cable main body and the second cable main body comprise detachable assemblies, the detachable assemblies comprise connecting frames, groove bodies are formed in the connecting frames, insertion blocks are inserted into the groove bodies, and the insertion blocks are inserted into the groove bodies. The cable comprises a first cable main body and a second cable main body, an insertion block is arranged in the first cable main body, two sides of the insertion block are connected with a spring and a buffer sleeve, the buffer sleeve is in an arc shape, a connecting assembly is arranged between the first cable main body and the second cable main body, and the connecting assembly comprises a first polyurethane elastic rib. The wear rate of the sheath layer is reduced by more than 60%, the detachable assembly realizes rapid disassembly and assembly of the first cable main body and the second cable main body, and the cable is suitable for combination requirements of different numbers of cables and has strong versatility.

The invention discloses a gear broken tooth failure diagnosis method and a related device under a friction dynamics coupling condition, and relates to the technical field of gear broken tooth failure diagnosis, and the method comprises the steps: solving a dynamics model in a gear transmission process under the friction dynamics coupling condition, the method comprises the following steps: obtaining a rotation angle of a driving gear and a rotation angle of a driven gear, further calculating to obtain gear tooth root bending stress and a gear bending fatigue safety coefficient, and decomposing vibration signals in a transmission process of the driving gear and the driven gear by utilizing an ICEEMDAN algorithm when determining that a tooth breakage risk exists based on the gear bending fatigue safety coefficient. And further determining a support vector, calculating a distance between the support vector and a sphere center of a reference hypersphere constructed by using an SVDD algorithm, and calculating to obtain a gear health degree based on the distance so as to complete gear tooth breakage failure diagnosis. According to the method, the calculation precision of the gear tooth root bending stress and the diagnosis precision of gear tooth breakage failure diagnosis can be improved.

This invention discloses a method and apparatus for testing the bending fatigue of a steel wire rope in a smart vehicle drum. The apparatus includes a container plate, a steel wire rope clamping assembly mounted on the container plate, and a camera assembly mounted on the opposite side of the container plate. The steel wire rope clamping assembly holds the center point of the steel wire rope to keep it constant. The back plate of the container plate has steel wire rope bending drive assemblies above and below the steel wire rope clamping assembly. These drive assemblies fix the upper and lower ends of the steel wire rope and drive them to swing around the center point. The camera assembly captures an image of the center point of the steel wire rope while the upper and lower ends swing around the center point. The camera assembly is connected to a processing system that tests the bending fatigue of the steel wire rope based on the image changes of its center point. This invention can quickly and accurately identify image changes in the center point of the steel wire rope.

The invention discloses an anti-bending and anti-fracture bamboo louver blade and a preparation process thereof, and belongs to the field of building decoration materials. In order to solve the problems that a traditional bamboo louver blade is prone to breakage and bending failure due to the fact that bamboo wood is low in cross grain strength and high in hygroscopicity, performance breakthrough is achieved through multi-dimensional synergistic modification. The preparation process comprises the following steps: selecting bamboo wood of 3-5 years old, cutting the bamboo wood, performing ultrasonic cleaning with sodium carbonate, treating linen fibers with acetic acid and a silane coupling agent, performing vacuum permeation and plastification with a glycerol-citric acid solution, constructing a bamboo wood-fibrofelt-bamboo wood three-layer composite structure, performing hot-pressing curing, and performing gradient drying, low-temperature circulation and beeswax-nano silicon dioxide coating edge sealing. Experiments show that the louver blade can resist bending for 5200 times, the elongation at break is 8.2%, the bending strength is 140 MPa, and the impact strength is 65 kJ / m < 2 >. Compared with a single reinforcing process of resin impregnation or recombined fibers, the bending fatigue resistance is improved by 32.7%-46.2% through cooperation of plasticizing modification, a laminated structure and surface protection, and the method is suitable for high-end building decoration scenes.

The utility model relates to the technical field of steel bar fatigue detection, in particular to an electric fatigue testing machine for a hot-rolled ribbed steel bar, which can be used for detecting the bending fatigue strength of the ribbed steel bar at high temperature, and is convenient to use and high in practicability. Comprising a bottom plate, a supporting frame, a box body and a sealing door, the box body is installed at the upper end of the bottom plate through the supporting frame, a cavity is formed in the box body, an opening communicated with the cavity is formed in the front end of the cavity of the box body, and the sealing door is installed at the opening in the front end of the cavity of the box body; the device further comprises a clamping mechanism, a heating mechanism, a pressing mechanism and a supporting mechanism, the clamping mechanism is installed on the box body, the clamping mechanism has a clamping and fixing function, the heating mechanism is installed on the box body, the heating mechanism has a heating function, the pressing mechanism and the supporting mechanism are both installed on the box body, the pressing mechanism has a pressing function, and the supporting mechanism has a pressing function. The supporting mechanism has a supporting function.

This invention provides a fatigue-resistant high-strength spring steel and its preparation method. By synergistically designing the chemical composition of the iron-based alloy, the low-hydrogen clean molten steel intermediate, the hot rolling controlled cooling, and the quenching-partitioning heat treatment, the steel after stress relief treatment includes tempered martensite and 4-12 vol% retained austenite, and contains nano-precipitates. This results in a fatigue-resistant high-strength spring steel with a tensile strength of 2050-2250 MPa, an elongation after fracture of 8-12%, a reduction of area of ​​30-45%, and a rotational bending fatigue strength of 800-950 MPa. This invention solves the problem of balancing ultra-high strength and long-life fatigue resistance, and the difficulty in achieving both cold-rolling forming processing window and post-stress relief microstructure and dimensional stability. It is suitable for the preparation of high-load spring components.

The application discloses a room temperature bending fatigue life improvement and prediction method of a ceramic piece containing microcracks, and belongs to the technical field of mechanical structure strength. The method comprises the following steps: collecting the spatial information of microcracks on an original ceramic piece, testing the power index and critical fatigue life of the original ceramic piece; processing the microcracks into circular holes according to the spatial information of the microcracks, performing a polishing and cleaning process on the circular holes, obtaining a processed ceramic piece, and completing room temperature bending fatigue life improvement; performing size measurement on the circular holes to obtain the radius and cross-sectional area of the circular holes, calculating the stress limit of the processed ceramic piece under the action of static load by using the radius and the cross-sectional area; drawing an S-N curve of the processed ceramic piece by using the stress limit, the power index and the critical fatigue life; and testing the maximum bending stress of the processed ceramic piece, taking the corresponding abscissa of the maximum bending stress on the S-N curve as the prediction result of the room temperature bending fatigue life.

The invention relates to a gear, a wind generating set and a gear design method, the gear has a main rotation direction, from the cross section view of the gear, a tooth groove of the gear is provided with a working face side, a first tooth profile, a first tooth root transition curve, a second tooth profile and a second tooth root transition curve, the non-working face side is located behind the working face side in the main rotation direction, and the non-working face side is provided with a second tooth profile and a second tooth root transition curve which are connected; wherein the first tooth profile and the second tooth profile are symmetrically arranged relative to a symmetry plane, and a preset distance exists between the connection point of the first tooth root transition curve and the second tooth root transition curve and the symmetry plane. And the connection point of the first tooth root transition curve and the second tooth root transition curve is closer to the second tooth profile than the first tooth profile. According to the technical scheme, the bending fatigue strength of the working face side of the gear can be improved while the size of the gear is not increased.

The invention discloses an anti-bending photovoltaic electrical cable and a preparation method thereof, and belongs to the technical field of electrical cables, and the cable comprises a conductor core, an insulating layer, a flexible middle layer and an outer sheath layer which are sequentially arranged from inside to outside. And the conductor core adopts a heterostructure formed by layering and twisting an inner layer high-ductility metal wire and an outer layer high-tensile strength metal wire in opposite twisting directions. And the flexible middle layer is made of a thermoplastic elastomer with specific hardness. The outer sheath layer is made of a weather-resistant elastomer composite material reinforced by a composite mineral filler, and the composite mineral filler is a mixture of surface-modified flaky talcum powder and chopped glass fibers. The preparation method of the cable comprises the processes of conductor stranding annealing, insulation irradiation crosslinking, co-extrusion of the flexible middle layer and the outer sheath layer and the like. The cable disclosed by the invention is suitable for dynamic bending occasions such as a photovoltaic tracking bracket and the like, and has excellent anti-bending fatigue life and long-term reliability in a severe environment.

This invention discloses a flexible aluminum alloy conductor and its preparation method, relating to the field of metal materials technology. The raw materials of the flexible aluminum alloy conductor include, by weight percentage: A 0.005-2.198 wt%, rare earth elements 0.001-7.670 wt%, Al 90.002-99.999 wt%, and unavoidable impurities with a total content ≤0.105 wt%. The flexible aluminum alloy conductor is prepared by a process of continuous casting, hot rolling followed by rapid cooling, slow cooling with sealing, cold drawing deformation, and segmented temperature-controlled annealing under low-oxygen and nitrogen protection. Through the synergistic effect of Fe and rare earth elements, combined with strict control of Si content, the flexible aluminum alloy conductor achieves good flexibility and resistance to bending fatigue while maintaining high conductivity and strength.

The present application relates to the technical field of ultra-high performance concrete, and particularly discloses a fatigue performance evaluation method for a steel-UHPC combined bridge deck, which is used to solve the problem that the existing evaluation method does not consider the influence of structural fatigue performance degradation, and it is difficult to accurately predict the fatigue damage evolution process of the steel-UHPC combined bridge deck in its service life, resulting in that the evaluation result may be unsafe; according to the structural parameters and material properties of the reinforced UHPC layer, the fatigue performance of the reinforced UHPC component under the action of axial tension fatigue load is evaluated, the fatigue performance of the super-thin UHPC bolted connection under the action of shear fatigue load is analyzed, the bending fatigue performance of the steel-UHPC-paving combined plate is analyzed based on the five-point bending test, and the time-varying fatigue analysis framework of the steel-UHPC combined bridge deck with the degradation of steel-concrete combined effect is established, so that the evaluation result is more reliable, and the risk of being unsafe is reduced.

The utility model discloses a quick sample replacement fixture of a cantilever beam rotating bending fatigue testing machine, which comprises a mounting seat, a moving mechanism mounted on the mounting seat, clamping seats arranged at two ends of the moving mechanism, clamping mechanisms rotationally mounted on opposite side surfaces of the clamping seats, and driving mechanisms arranged on the clamping mechanisms. According to the device, through the synergistic effect of the moving mechanism and the driving mechanism, rapid clamping and dismounting of the samples are achieved, the moving mechanism can make the clamping base rapidly move to a proper position so as to adapt to the samples of different lengths, and the driving mechanism can rapidly drive the clamping mechanism to complete clamping and loosening actions on the samples of different shapes and specifications; the time for replacing the sample is greatly shortened, and the test efficiency is improved.

The invention discloses a mining machinery multi-core cable convenient to bend and lay, which comprises a plurality of wire core groups and an outer sheath arranged outside the plurality of wire core groups, each wire core group comprises a power wire core, a control wire core and a signal wire core, and each wire core group comprises a conductor and an insulating layer wrapping the conductor; the cable also comprises an elastic buffer unit array structure, and the elastic buffer unit array structure is arranged between the wire core group and the outer sheath. According to the invention, the bending stress is effectively absorbed and dispersed through the elastic buffer unit array structure, the bending rigidity of the cable is remarkably reduced, and the bending fatigue resistance of the cable is greatly improved; signal interference is avoided through an asymmetric clover-shaped electromagnetic isolation and counterweight structure, and the cable balance is optimized; through an anchoring structure of the tensile woven mesh and the sheath, relative displacement between the outer sheath and the internal elastic buffer unit array structure is prevented.

The application discloses a treatment process for improving the three-point bending fatigue limit of a thin-walled titanium alloy test piece, relates to the field of improving fatigue resistance of metal material processing, and comprises the following steps: pretreating a TC4 titanium alloy sheet to obtain a test piece; performing laser shock peening on the test piece by using ultrafast laser; setting a load; performing three-point bending fatigue experiments on the test piece before and after the peening; calculating the bending fatigue limits of the test piece before and after the peening; and performing strengthening mechanism analysis and comparison. The process can perform peening on the three-point bending test piece of the thin-walled TC4 titanium alloy by optimizing the combination of femtosecond laser energy and peening times, introduce gradient structure and residual compressive stress in the surface layer by using the high strain rate plastic deformation induced by the ultrafast laser, inhibit the initiation of the fatigue cracks, avoid the expansion of the heat affected zone and the deformation of the test piece, and thus improve the bending fatigue performance of the test piece.

The invention relates to the technical field of ocean engineering special cables, and discloses a high-tensile trailing cable for ocean engineering and a preparation method of the high-tensile trailing cable. The cable sequentially comprises a cable core, an inner sheath, a gradient composite tensile layer, a segmented functional sheath and an outer sheath from inside to outside, wherein the gradient composite tensile layer is tightly coated outside the inner sheath and comprises an inner layer and an outer layer, the inner layer is a high-modulus fiber braid layer, and the outer layer is a metal and fiber composite braid layer; the gradient composite tensile layer is coated with the segmented functional protection layer, the segmented functional protection layer is divided into two sections with different structures in the length direction of the cable, the two sections are a top section used close to the water surface and a bottom section used for a deep water area, the top section adopts a corrugated composite protection layer structure, and the bottom section adopts a smooth bonding protection layer structure. The cable provided by the invention realizes unification of high tensile strength, excellent dynamic bending fatigue performance and high hydrostatic pressure crushing resistance, and solves the problem that a cable with a single structure cannot adapt to full-sea-depth working conditions.