74 results about "Nanoindentation" patented technology

The invention discloses a rock nanoindentation numerical simulation method based on PFC discrete elements, and relates to an unconventional natural gas reservoir fracturing technology. Comprising the following steps: dynamically loading an iterative matching load-displacement curve based on XRD-SEM-EDS mineral spatial distribution of a rock sample and single mineral nanoindentation experimental data microscopic parameters; in combination with mineral space distribution data, constructing a multi-mineral heterogeneous model by stages, and dynamically loading simulation; based on crack number development, force chain distribution and particle displacement vector characteristics, a regulation and control mechanism of a mineral interface coupling effect and pore stress concentration on a crack propagation path is quantitatively analyzed. According to the invention, a heterogeneity evolution mechanism of force chain development and crack propagation in each stage of loading, load holding and unloading can be analyzed, and a dynamic mechanism that mineral components and pore structures cooperatively regulate and control a crack propagation path and nonlinear load response is disclosed; and a solution path is provided for rock microscopic damage mechanism prediction and heterogeneous material discrete element numerical simulation modeling.

The invention provides a method and a device for evaluating and measuring microscopic mechanical properties of TC4 alloy, relates to the technical field of microscopic mechanical properties, and realizes accurate evaluation of material properties through combination of multi-scale characterization and numerical simulation. Firstly, a standard sample is prepared through selective laser melting, and residual stress field distribution is obtained through X-ray diffraction; dividing a stress field into sub-regions, and establishing a quantitative relationship between microscopic structure parameters and residual stress by combining SEM and EBSD analysis; the method comprises the following steps: acquiring local mechanical properties through a nanoindentation test, and constructing a stress-performance correlation model; and finally, establishing a finite element model, transmitting stress and tissue parameters by adopting trilinear interpolation and an inverse distance weighting method, verifying data reliability through a stress difference criterion, and calculating mechanical properties of each unit. According to the method, multi-scale correlation from microstructure characteristics to macroscopic mechanical properties is innovatively realized, so that the mechanical property distribution of the material is accurately evaluated.

The invention discloses a method for estimating the boundary shear stress of a salt rock single crystal sliding face, belongs to the technical field of geotechnical engineering mechanics and material mechanics, and establishes a frame capable of directly estimating the boundary shear stress of the salt rock single crystal sliding face based on the Hall-Pearch theory. The mapping from the measurable macromechanical parameters to the boundary shear stress of the microcosmic single crystal slippage surface is realized. The method only needs conventional cold pressing preparation, EBSD grain size data and uniaxial compression test results, and does not need to depend on high-cost FIB microcolumn compression or in-situ nanoindentation tests. The method can provide more accurate material mechanical parameters for salt cavern design, creep stability analysis and underground engineering safety evaluation, and has good engineering applicability and wide engineering application prospects.

A casing material for a power storage device, including a laminate that includes, in order, at least a base material layer, a barrier layer, and a heat-fusible resin layer. The heat-fusible resin layer includes a single layer or a plurality of layers. The heat-fusible resin layer includes at least one layer having a hardness of at least 70 MPa from a cross-section in the lamination direction of the laminate, measured using a nanoindentation method using an indentation load of 100 μN.

The invention discloses a multi-scale performance evaluation and optimization method and device for well cementation cement stone, and relates to the technical field of oil exploitation, the well cementation cement stone is subjected to nanoindentation test and scanning electron microscope microstructure test, and a mechanical property-microstructure test result is obtained; performing electronic computer tomography and mercury injection test on the well cementation cement stone, and constructing a pore network three-dimensional model; performing triaxial mechanical property test, thermogravimetric analysis and thermal expansion test on the well cementation cement stone to obtain a thermal-mechanical coupling test result; performing X-ray diffraction and X-ray fluorescence spectrum analysis on the well cementation cement stone to obtain mineral phase information and element information of the cement stone; according to the method, a mechanical property-microstructure test result, topological parameters, a thermal-mechanical coupling test result, cement stone mineral phase information and element information are fused, an optimal design scheme for target well conditions is generated, multi-dimensional performance testing and characterization are achieved, and an accurate basis is provided for well cementation cement stone optimal design and quality control.

The invention relates to a mechanical property simulation method for researching the service life of an aluminum alloy material for a reactor. The simulation method for the life period mechanical property of the aluminum alloy material comprises the following steps: S1, preparing initial, middle and last stage aluminum alloy samples according to a < 27 > Al-< 28 > Si transmutation path of the aluminum alloy material; s2, representing the sample by using a transmission electron microscope, obtaining precipitated particle parameters, calculating a volume fraction f, fitting f and operation time t, and constructing a precipitation evolution model f (t); s3, performing high-energy ion irradiation on the sample, and performing nanoindentation experiment and load-depth curve fitting to obtain nano hardness H; s4, based on the f (t), establishing a relation model of the nano hardness H and the irradiation damage D; and S5, calculating the change quantity of the nano hardness H, converting the change quantity into the change quantity of the yield strength, associating the irradiation damage D with the service time T, and establishing a life period yield strength prediction model. According to the method, the mechanical property of the aluminum alloy in the full service cycle of the research reactor can be accurately evaluated.

The invention discloses a quantitative evaluation method for shale brittleness based on bedding characteristics, and relates to the field of petroleum and natural gas engineering, in particular to the quantitative evaluation method for the shale brittleness based on the bedding characteristics in the exploration and development process, and the quantitative evaluation method comprises the following steps: taking a rock sample from shale at a target layer to obtain the maximum Young modulus of a block; calculating a macroscopic brittleness index; processing the rock sample into a cuboid rock block for a nanoindentation experiment, calculating an interlayer heterogeneous coefficient between two corresponding adjacent probes according to mechanical parameters at the same transverse position between stratums so as to obtain a microscopic brittleness index, and calculating the total brittleness index of the rock by combining the microscopic brittleness index with the macroscopic brittleness index; microcosmic rock mechanics experimental data between different stratums of shale are tested on the basis of nanoindentation for the first time, heterogeneity between different stratums is quantitatively calculated, quantitative evaluation of shale rock microscopic brittleness is achieved, and compared with a conventional macroscopic evaluation method, quantitative evaluation is further improved.

The invention relates to a method for obtaining mechanical properties of granite and application of the granite in deep geological disposition, local mechanical parameters (elastic modulus, hardness and fracture toughness) of the granite are obtained through a nanoindentation experiment, the reliability of a model is verified in combination with finite element numerical simulation, and experiment and simulation results show that the mechanical properties of the granite can be obtained. The method can accurately predict the mechanical property degradation trend of the granite in the high-temperature and high-pressure environment (for example, the elastic modulus is reduced to 54.71 GPa at 650 DEG C, and the hardness is reduced by 34.38%), and an efficient and reliable analysis tool is provided for surrounding rock stability evaluation of a high-level radioactive waste geological repository.

The invention provides a monocrystalline silicon wafer subsurface damage depth prediction method, which is characterized by comprising the following steps: S1, based on an indentation fracture mechanics theory, obtaining a theoretical relationship between a subsurface damage deformation area depth and a subsurface microcrack depth after processing of a monocrystalline silicon wafer; s2, processing the monocrystalline silicon ingot to obtain a monocrystalline silicon wafer; s3, performing a nanoindentation experiment on the monocrystalline silicon wafer to obtain a relation curve between an elastic recovery parameter and a maximum imprinting load; s4, solving the depth of a sub-surface damage deformation area of the processed monocrystalline silicon wafer through the inflection point of the curve; and S5, predicting the subsurface microcrack depth of the monocrystalline silicon wafer in combination with the obtained theoretical relationship. According to the method, the subsurface damage depth can be accurately predicted only by measuring the depth of the subsurface damage deformation area through the nanoindentation experiment, the damage to the workpiece is minimum, the operation is simple during detection, the influence of the experience of an operator is small, and the detection cost and difficulty are reduced.

The invention relates to a method and a product for eliminating helium bubble defects in nuclear power steel, which comprises the following steps of: treating the nuclear power steel which is damaged by helium ion irradiation to generate helium bubble gathering and surface hardening by pulse current, eliminating the helium bubble defects, recovering the surface hardness of the nuclear power steel, and realizing dynamic self-repairing of irradiation damaged tissues of the nuclear power steel. The method is suitable for pulse current elimination of irradiation helium bubble defects of nuclear power steel such as austenitic stainless steel and austenite-ferrite duplex stainless steel, and is also suitable for pulse current elimination of irradiation helium bubble defects of any metal material. Experiments prove that helium bubbles induced by irradiation cause serious hardening of the surface of the material, and after the helium bubbles are eliminated through pulse current treatment, nanoindentation tests show that the hardness of the material is remarkably reduced and basically returns to the original level before irradiation. The method has the advantages of short treatment time and low energy consumption, and can effectively prolong the service life of key components such as nuclear-grade main pipelines.

The application discloses a high-entropy rare earth strontium aluminate thermal barrier coating material with high fracture toughness and a preparation method thereof, and belongs to the technical field of thermal barrier coatings. 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 )2SrAl2O7. The high-entropy rare earth strontium aluminate thermal barrier coating material is synthesized by a solid phase method. According to the high-entropy design of the rare earth strontium aluminate, five different rare earth elements are doped in the rare earth position, the dislocation resistance of the ceramic is increased by using the serious lattice distortion effect, and the mechanical properties are improved. Through nanoindentation test, the fracture toughness reaches 2.15MPa.m 0.5 , so that the high-entropy rare earth strontium aluminate thermal barrier coating can better prevent the growth and extension of cracks.

The invention provides a quantitative evaluation method for micro-area comprehensive mechanical properties of an electron beam welding joint, and belongs to the technical field of material mechanical property evaluation.A load-displacement curve is obtained through a nanoindentation test, and a data processing method combining numerical integration and high-order derivative calculation is adopted, so that the comprehensive mechanical properties of the electron beam welding joint are evaluated. Meanwhile, three performance parameters of strength, plasticity and strain hardening are extracted, and a quantitative mapping relation between the three performance parameters and the microcell structure is established. The method solves the problem of mechanical property quantitative evaluation of gradient structures of a fusion zone, a heat affected zone and a base metal zone of a welding joint, and the problems of high cost, low efficiency, single parameter and the like in the existing evaluation technology.

This invention discloses a discrete element method, system, medium, and equipment for simulating equivalent crystalline materials, relating to the field of numerical simulation of rock mechanics. The method includes: converting granite images into binary images using a binarization method to identify various minerals within the binary images; determining the size data of various minerals in the binary images based on a particle size statistical algorithm; extracting micromechanical parameters using nanoindentation experiments combined with a trial-and-error method, and constructing multiple sets of equivalent crystalline models based on the mineral size data; dividing each set of equivalent crystalline models into multiple regions using a Brazilian splitting experiment; determining the optimal magnification for each region of each set of equivalent crystalline models by magnifying from non-critical regions to critical regions using a magnification algorithm, obtaining differentiated equivalent crystalline models; and performing Brazilian splitting numerical simulation using these differentiated equivalent crystalline models to obtain simulation results.

The present invention belongs to the technical field of green and environmentally friendly road materials and relates to a method for evaluating the microstructure of hydration products of composite solid waste-based alkali-activated cementitious materials. The method comprises: 1) preparing a composite solid waste-based alkali-activated cementitious material specimen; 2) curing the composite solid waste-based alkali-activated cementitious material specimen; 3) subjecting the composite solid waste-based alkali-activated cementitious material specimen to SEM-EDS, nanoindentation, FTIR, and MIP testing, respectively, and obtaining test results, the test results including SEM-EDS, nanoindentation, FTIR, and MIP; and 4) selecting any two of the test results for cross-reference analysis, ultimately performing a multi-angle and comprehensive evaluation of the microstructure of the hydration products of the composite solid waste-based alkali-activated cementitious material. The present invention has the advantages of improving evaluation quality and speed.

The invention discloses an irradiation hardening coefficient generation method and an irradiation hardening evaluation method, and relates to the technical field of irradiation hardening. The coefficient generation method comprises the following steps: performing ion irradiation on a test sample, and simulating according to ion irradiation parameters to obtain an irradiation damage depth distribution map; performing nanoindentation test on the test sample subjected to ion irradiation and a control sample of the test sample to obtain a first load displacement curve of the test sample and a second load displacement curve of the control sample; obtaining first and second simulated load displacement curves according to the first and second load displacement curves; obtaining a first elastic-plastic transition point and a second elastic-plastic transition point according to the first load displacement curve, the first simulated load displacement curve, the second load displacement curve and the second simulated load displacement curve; and obtaining the irradiation hardening coefficient according to the first elastic-plastic transition point, the second elastic-plastic transition point and the irradiation damage depth distribution map. Therefore, the radiation hardening can be quantitatively evaluated.

The present disclosure discloses a molecular dynamics modeling method for alloy steel containing multiple alloying elements, which is not only used for modeling but also for further evaluation: first, an iron matrix model of a certain size and shape is established, and then a certain amount of iron atoms are replaced with a certain amount of atoms of a first type of alloying element by atomic replacement, and a certain amount of atoms of a second type of alloying element are added to the iron atom model by random insertion, and the atoms are evenly distributed to form an initial molecular dynamics model of the alloy steel; further, in order to avoid the randomly inserted atoms of the second type of alloying element from overlapping with other atoms or being too close to each other, resulting in excessive system stress and energy, the model is energy minimized, and then the model is simulated through melting, cooling and room temperature aging processes to fully eliminate gaps, structural cracks, etc. in the model and reduce stress within the model; finally, the model is verified and evaluated by means of nanoindentation simulation.

The invention discloses a nanoindentation parameter inversion method based on a neural network proxy model, and belongs to the technical field of material mechanical property characterization, and the method comprises the steps: obtaining nanoindentation test displacement data of a target welding spot material under the combination of multiple strain rates and temperatures, and constructing a test sample set; determining a to-be-identified viscoplastic constitutive model, constructing a to-be-inverted parameter vector and a value range, and forming a parameter space; latin hypercube sampling is adopted to generate a construction parameter set in a parameter space, model files are generated and submitted to finite element simulation in batches, and a simulation sampling set is obtained; carrying out convergence and physical consistency screening on the simulation sampling set, and removing abnormal samples to obtain an effective simulation sample set; training a neural network agent model by using the effective simulation sample set; and outputting a to-be-inverted viscoplastic constitutive parameter vector for the test sample set based on the trained model. The method is high in parameter acquisition efficiency, strong in adaptability and good in inversion effect, and has good engineering applicability and popularization value.

The invention discloses a rock elasticity modulus prediction method and device, electronic equipment and a storage medium. The method comprises the following steps: in the process of carrying out nanoindentation test on at least two position points of a rock sample, respectively obtaining nanoindentation test data corresponding to each position point in real time; determining a mineral component type corresponding to each position point; wherein the mineral components comprise a hard component and a soft component; determining a hard component elastic modulus and a soft component elastic modulus of the rock sample according to the nanoindentation test data corresponding to each position point and the mineral component type corresponding to each position point; and determining the rock elasticity modulus of the rock sample based on the hard component elasticity modulus and the soft component elasticity modulus. Through the technical scheme provided by the embodiment of the invention, the problem that part of parameters are assumed and are difficult to calculate in an existing model is solved, and accurate prediction of the elastic modulus of the rock is realized.

The invention discloses a three-stage step type nanoindentation creep test indenter and a preparation method thereof. A working part of the pressure head body is composed of three platform-shaped steps which are sequentially distributed in the direction of a central axis, the cross sectional areas of the three platform-shaped steps are increased in a stepped mode, the overall outline of the pressure head body is in a triangular pyramid shape, the surface of the pressure head body is an sp3 hybrid diamond crystal surface subjected to low-temperature catalytic molten salt etching treatment and without an amorphous carbon damage layer, and the curvature radius of the tip of the first step is smaller than 10 nm; the preparation method comprises the following steps: processing a blank by using a focused ion beam; performing pre-passivation to form a tungsten-containing solid precursor film; immersing into low-temperature molten salt containing a vanadium catalyst for reaction; and finally quenching and cleaning. According to the method, through a catalytic cooling and adsorption shielding cooperation mechanism, the sharp point sharpness is effectively kept while an amorphous carbon damaged layer is removed, parasitic creep interference caused by an amorphous layer is eliminated, and cross-scale graded high-precision testing is achieved.

The present invention belongs to the technical field of oil and gas resource exploration and discloses a classification method, system, medium, equipment, and terminal for fine-grained sedimentary particles. Based on multi-scale, multi-field scanning electron microscopy identification technology, the microstructural images of fine-grained sedimentary rocks are spliced ​​and identified using FE-SEM. The identified images are then grayscale processed using ImageJ software to determine the microstructural characteristic parameters of the fine-grained sedimentary particles. Nanoindentation experiments are used to measure the micromechanical properties of the fine-grained sedimentary particles, including hardness and elastic modulus. A five-unit characterization method is constructed using particle size, flatness, angularity, elastic modulus, and hardness to determine the characteristics of the fine-grained sedimentary particles. Based on the principle of the five basic properties of fine-grained sedimentary particles, the combination types of fine-grained sedimentary particles are classified. The novel image analysis technology of the present invention is more comprehensive and intuitive than local observation under a scanning electron microscope, providing new ideas for quantitative characterization and qualitative analysis of microstructures.

The invention discloses a carbonate rock cross-scale mechanical property characterization method. The carbonate rock cross-scale mechanical property characterization method comprises the following steps: S1, basic physical property characterization; s2, processing a carbonate rock micromechanics experiment sample; s3, scanning electron microscope observation and microcosmic mineral identification; s4, correcting the area function of the needle tip of the pressing needle; s5, testing the micromechanical property of the carbonate rock mineral; s6, carrying out data arrangement on the micro-mechanical properties and the composition proportion; and S7, constructing a mechanical upscaling model and calculating macromechanical properties. According to the method, main mineral types in carbonate rocks are identified by utilizing a scanning electron microscope and energy spectrum analysis on a microscopic scale, and then the mechanical properties of different minerals are quantitatively represented by utilizing quasi-static nanoindentations. On the basis, mineral composition proportion information and porosity data are synthesized, an upscaling model of the mechanical property is constructed, and cross-scale prediction and evaluation of the macroscopic mechanical property of the carbonate rock are achieved.

The invention discloses elemental boron B60, a preparation method thereof and a preparation method of Na4B60. The boron elementary substance B60 disclosed by the invention is characterized in that the crystal structure of the boron elementary substance B60 belongs to an Ima space group, a structural framework of each unit cell is formed by four B12 icosahedrons on average, and gaps among the four B12 icosahedrons are filled with the rest 12 B atoms. The invention also relates to a preparation method of the boron simple substance B60, which comprises the step of synthesizing the boron simple substance at 400-1000 DEG C under a vacuum condition by using Na4B60 as a raw material. The invention also relates to a preparation method of the Na4B60, which comprises the step of enabling a boron simple substance, a sodium simple substance and a zinc simple substance to react at the pressure of 0.5 GPa or higher and the temperature of 1000 DEG C or higher to obtain the Na4B60. The method is simple in process, low in cost and suitable for large-scale production. The obtained boron simple substance has the advantages of high purity, narrow optical band gap, high conductivity, high nanoindentation hardness and unique plastic deformation capacity, and has application potential in the fields of electronic devices, high-temperature ceramics and the like.

The present application relates to the technical field of sediment environment monitoring, and discloses a turbidity current sediment microplastic extraction, identification and physical and mechanical property testing method, which comprises the following steps: turbidity current observation data are screened through a quality control threshold value, and the concentration of suspended bodies and hydrodynamic environment characteristic data are obtained by using an acoustic inversion model and a vertical integral algorithm; the position of sediment sampling is determined by using computer tomography technology, and a C-M diagram is constructed in combination with particle size analysis to accurately identify the turbidity current sediment horizon; the horizon sample is subjected to multi-stage density flotation by using saturated potassium iodide solution, and microplastic samples to be tested are obtained by cooperating with chemical digestion; the polymer material is identified by using spectrum technology, and the hardness, elastic modulus and yield strength of the microplastic are calculated by using nanoindentation technology to record the load and displacement curves. The present application solves the problems of low extraction efficiency of deep-sea microplastics and lack of mechanical constitutive parameters, and realizes the coupling analysis of macroscopic dynamics and microscopic physical properties.

The present invention relates to the field of nanoindentation testing technology. The present invention discloses a nanoindentation testing device, comprising a frame, an indentation testing mechanism, a stage, a laser light source, a sealed chamber, an atmosphere simulation mechanism and a vacuum mechanism, wherein the indentation testing mechanism comprises an indenter, a drive system and a measurement system, the indenter moves along a vertical axis; the laser light source faces the stage; the sealed chamber and the indenter are located on the same vertical axis, the stage is located in the sealed chamber, the indenter extends into the sealed chamber from the indenter avoidance port, the sealed chamber is provided with a laser avoidance window, the laser avoidance window is located on the laser light path, and the sealed chamber is also provided with a gas inlet and a gas outlet. The present invention can achieve non-contact local heating by directly acting on a sample to be tested in the sealed chamber through the laser light source; through the cooperation of the sealed chamber with the atmosphere simulation mechanism and the vacuum mechanism, the sample to be tested can be tested under vacuum, inert atmosphere or specific working atmosphere conditions.

The present application relates to the technical field of rock mechanics test, and more particularly to a nanoindentation system in-situ mechanical test device and test method, the test device is installed on the test instrument base, comprising a test instrument base, a loading platform is installed on the test instrument base, the loading platform comprises an adjusting box, clamping assemblies are symmetrically arranged at the two ends of the adjusting box, a telescopic cylinder is connected between the adjusting box and the clamping assemblies, and side support assemblies are movably arranged on the two sides of the adjusting box; the clamping assembly comprises a clamping block, a locking sliding block is movably arranged at one end of the clamping block, and an adjusting sliding block is arranged at the other end of the clamping block, the adjusting sliding block is slidably connected or separated from the clamping block, a rotating pressing plate is rotatably arranged on the locking sliding block, the side support assembly further comprises an adjusting cylinder, and the telescopic end of the adjusting cylinder is slidably matched with the adjusting sliding block through an adjusting block; the test method is applied to the test device, a cuboid rock sample is clamped, a bidirectional compression force or a shear force or a tensile force is applied to the sample through the telescopic cylinder and the adjusting cylinder, and internal stress of the rock material is simulated.

The invention relates to the technical field of nanoindentation testing, and discloses a nanoindentation testing device which comprises a rack, an indentation testing mechanism, an objective table, a laser light source, a sealing cavity, an atmosphere simulation mechanism and a vacuum mechanism, the indentation testing mechanism comprises a pressing head, a driving system and a measuring system, and the pressing head moves along the vertical axis; the laser light source faces the objective table; the sealing cavity and the pressing head are located on the same vertical axis, the objective table is located in the sealing cavity, the pressing head stretches into the sealing cavity from the pressing head avoiding opening, the sealing cavity is provided with a laser avoiding window, the laser avoiding window is located on a laser light path, and the sealing cavity is further provided with a gas inlet and a gas outlet. According to the invention, the laser light source directly acts on the sample to be tested in the sealed chamber, so that non-contact local heating can be realized; through the cooperation of the sealed chamber, the atmosphere simulation mechanism and the vacuum mechanism, the sample to be tested can be tested under the conditions of vacuum, inert atmosphere or specific working atmosphere.

The invention relates to the technical field of material micro-area mechanical property testing, and discloses a material mechanical constitutive inversion analysis method and device and electronic device.The method comprises the steps that a nanoindentation test is conducted on a to-be-tested material, and an average load-depth curve is obtained; extracting inversion input parameters based on the average load-depth curve; constructing a dimensionless function based on dimensional analysis and a characteristic strain method, fitting the dimensionless function, and establishing a Ludwick constitutive inversion model; and on the basis of the inversion input parameters and the Ludwick constitutive inversion model, the mechanical constitutive parameters are solved, the multiple mechanical constitutive parameters of the material can be directly and uniquely inverted, and the experiment complexity and cost are remarkably reduced while the accuracy and uniqueness of the inversion result are guaranteed.

The present invention discloses a low-temperature storage device for hydrate samples with low moisture content and a usage method thereof, belonging to the field of basic physical property testing of hydrates and geotechnical engineering. The device includes a low-temperature storage module, a vacuum pumping module, a liquid nitrogen injection module, and a backpressure control module connected to the low-temperature storage module. Specifically, during use, through the combination of each module and the cooperative design of the first valve, piston, and control rod in the low-temperature storage module, low moisture content is carried during the low-temperature storage and transfer of hydrate samples, avoiding the interference of moisture on low-temperature nanoindentation and scratch tests, ensuring the stability of test conditions and the reliability of experimental results, providing an effective technical means for basic physical property testing of hydrates and geotechnical engineering, and having strong practicability.

The invention relates to the field of nanoindentation experiments, and discloses a two-way locking adjustable clamping device for a nanoindentation sample polishing procedure, the two-way locking adjustable clamping device comprises a bottom plate, an angle adjusting assembly is arranged on the upper surface of the bottom plate, a stand column is arranged on the surface of the angle adjusting assembly, and a sliding plate penetrates through the surface of the stand column and is slidably connected with the surface of the stand column; and the side wall of the rear end of the sliding plate penetrates through and is in threaded connection with a positioning screw rod, and a clamping assembly is arranged on the inner wall of the bottom end of the sliding plate. Through a double-locking structure of horizontal lateral clamping and vertical downward pressing, a lateral clamping block is precisely attached to the side wall of a sample, an upper pressing plate always presses the upper surface of the sample under the action of a reset spring, and all-directional fixing is formed; and in cooperation with the thread self-locking performance of the positioning screw and the locking screw, even if facing high-speed polishing friction force, no displacement and no flying of the sample can be ensured, the damage rate of the sample is greatly reduced, and the experiment efficiency is remarkably improved.

The invention relates to the technical field of sediment environment monitoring, and discloses a method for extracting, identifying and testing physical and mechanical properties of turbidity current sediment microplastics, which comprises the following steps of: screening turbidity current observation data through a quality control threshold value, and acquiring suspension concentration and hydrodynamic environment characteristic data by using an acoustic inversion model and a vertical integral algorithm; determining a sediment sample separation position by using a computed tomography technology, and constructing a C-M diagram in combination with particle size analysis so as to accurately identify a turbidity current deposition layer; carrying out multi-stage density flotation on the horizon sample by adopting a saturated potassium iodide solution, and carrying out chemical digestion to obtain a micro-plastic sample to be detected; and identifying the material of the polymer by combining a spectrum technology, recording a load and displacement curve by utilizing a nanoindentation technology, and calculating the hardness, elastic modulus and yield strength of the micro-plastic. According to the method, the problems of low extraction efficiency and lack of mechanical constitutive parameters of deep-sea micro-plastics are solved, and coupling analysis of macrodynamics and microscopic physical properties is realized.