51 results about "Solid mechanics" patented technology

A method of evaluating a geometric parameter of a first fracture emanating from a first wellbore penetrating a subterranean formation is provided. The method includes the steps of forming the first fracture in fluid communication with the first wellbore; forming a second fracture in fluid communication with a second wellbore; measuring a first pressure change in the second wellbore in proximity to the first wellbore; and determining the geometric parameter of the first fracture using at least the measured first pressure change in an analysis which couples a solid mechanics equation and a pressure diffusion equation.

The invention discloses a mechanical property measuring device for natural gas hydrates. The device comprises a data collecting system, a vacuum pumping system, a natural gas pressurization air inlet system and a hydrate reaction still, wherein the hydrate reaction still comprises a reaction still base, an end cover, a force applying rod, a reaction still casing and a reaction bracket, the reaction still casing and the reaction still base are connected through a bolt and are sealed through a sealing ring, the end cover is connected with the reaction still base through a spiral stainless steel pipeline, the force applying rod penetrates in from the top part of the reaction still casing and is sealed through a sealing ring, one end of the force applying rod is propped against the end cover, the other end of the force applying rod is propped against the reaction bracket, a first inlet / outlet and a second inlet / outlet are formed in the end cover, a third inlet / outlet and a fourth inlet / outlet which penetrate through the center of a boss of the reaction still base are formed in the reaction still base, and the four inlets / outlets are connected with the vacuum pumping system and the natural gas pressurization air inlet system. The measuring device can be used for measuring the mechanical property of solids in situ under the conditions of high pressure and low temperature, the usage range of the existing device is expanded, and the measurement accuracy is improved.

The invention relates to a nondestructive testing method and equipment for elastic constants based on laser ultrasound. The method comprises the following steps of: focusing pulse laser light and acting the pulse laser light on an excitation point on the front surface of a material to be detected to generate ultrasonic waves; irradiating exploring laser light on a receiving point on the front surface of the material to be detected, and generating a Doppler effect and an interference phenomenon by reflected light to obtain a surface wave signal; displaying and storing a fluctuation image of thesurface wave signal changing with time by detecting a time origin of an ultrasonic signal provided by a pulsed laser signal on the surface of a sample; irradiating exploring laser light on a receiving point on the reverse side of the material to be detected, and generating a Doppler effect and an interference phenomenon by reflected light to obtain a longitudinal wave signal; displaying and storing a fluctuation image of the longitudinal wave signal changing with time; and calculating an elastic constant of the material to be detected according to a solid mechanics formula. According to the method provided by the invention, ultrasonic waves are excited by adopting laser ultrasound, so that longitudinal waves, transverse waves and surface waves can be simultaneously generated at one time,blind area-free measurement of ultrasonic waves of materials with same properties can be realized, and the precision of measuring the elastic constant is high.

The invention provides a numerical simulation analysis method for a loudspeaker falling process. The method comprises the steps of firstly building a finite element simulation model: 1) building a falling simulation geometric model containing a loudspeaker individual and concrete poured bricks; 2) setting a material model, a contact boundary condition, an initial condition, a constraint condition and a load force in a solid mechanics physical field; 3) setting material parameters; and 4) setting grid type and size, and performing grid division to generate the finite element model; and secondly solving the finite element model by adopting a transient analysis method, and performing post-processing to obtain change relationships of energy, stress, strain and displacement in the loudspeaker falling process, wherein the change relationships specifically include 1) the change relationship of total kinetic energy and total elastic strain energy of the loudspeaker along with time, 2) a distribution diagram of stress on a loudspeaker structure at a specified moment, 3) a displacement of a mass point on the loudspeaker structure at the specified moment, and 4) plastic strain capacity and distribution diagram of the loudspeaker.

Methods and systems for conducting numerical simulation of structural behaviors in solid mechanics using smoothed particle Galerkin formulation are disclosed. A meshfree model representing a physical domain defined by a plurality of particles is received in a computer system. Each particle is configured for material properties of portion of the physical domain it represents. A smoothed displacement field of the physical domain subject to defined boundary condition is obtained by conducting a time-marching simulation using the meshfree model based on smoothed particle Galerkin formulation. The smoothed displacement field is derived from a set of smoothed meshfree shape functions that satisfies linear polynomial reproduction condition. The set of smoothed meshfree shape functions is constructed by convex meshfree approximation scheme and configured to avoid calculation second order derivatives. The set of smoothed meshfree shape functions is a combination of regular meshfree shape function and a displacement smoothing function for the particles.

In a solid mechanics simulation of a deformable object having: a model representing a condition of the deformable object; a rendering module for presenting an image of the object in response to states of the elements of the object according to an oriented view; and a user interface for a user to mechanically interact with the model to deform the modeled object; an enhancement is provided that effectively supplies a refined rendering of the set of elements of the object in view, without adding elements to the model, so that the image is of an object defined locally to a higher degree than that of the model.

The invention discloses a numerical simulation analysis method for basic characteristics of a piezoelectric MEMS loudspeaker. The method comprises the following steps: 1) establishing a simulation geometric model of the MEMS loudspeaker; 2) setting physical fields and boundary conditions, including respectively setting material models, piezoelectric constitutive relations, dampers, constraint conditions, impedance boundaries, voltage loads and the like in 'solid mechanics', 'electric fields', 'pressure acoustics, frequency domains' and 'thermo-viscous acoustics, frequency domains' physical fields; 3) defining material parameters; and 4) setting the type and the size of the grid, and dividing the grid; 5) solving and calculating: respectively solving the finite element model by adopting frequency domain and characteristic frequency researches; and (6) result post-processing: obtaining a sound pressure level frequency response curve, a sound pressure and sound pressure level distributiondiagram, a change relation of capacitance values along with frequency, the magnitude and distribution diagram of stress / strain / displacement / speed / acceleration on a vibration part, and the resonance frequency and vibration mode of the MEMS loudspeaker through post-processing.

The invention relates to a method for establishing a mathematical model of damage rate evolution of recycled concrete under freeze-thaw, Because of the application of damage mechanics, The freeze-thawdamage degree of recycled concrete is defined by dynamic elastic modulus, and the freeze-thaw damage experiment of recycled concrete is designed. Then the relationship model between freeze-thaw damage degree of recycled concrete and different freeze-thaw cycles is established by quick freezing method, and the damage rate evolution mathematical model of recycled concrete under freeze-thaw is obtained. Therefore, the method for establishing a mathematical model of damage rate evolution of recycled concrete under freezing and thawing is based on macroscopic damage mechanics theory, and has a solid mechanics theory foundation compared with previous research methods, and the result accords with objective law and mechanics principle, and the conclusion obtained is accurate, clear and convincing. Compared with the previous research methods, the process of the damage rate evolution mathematical model established by the invention is controllable, the period is short, and the time and the costare greatly saved.

A device and a method for measuring the deformation of a high-speed rotating object under a high-temperature environment relate to the fields of materials, optical experiment, solid mechanics, and the like. According to the method, two groups of laser reflector plates are pre-installed on the surface of a measured object, wherein the reflector plates for measuring radial deformation are installed along the radial direction, and the reflector plates for measuring circumferential deformation are installed along the circumferential direction; the object is irradiated with a laser source when rotating at high speed, and the reflector plates reflect laser when being irradiated; the reflector plates installed along the radial direction reflect laser to a laser receiving screen, reflected laser spots on the receiving screen are shot by a high-speed camera, and the radial deformation is calculated according to the change in spot spacing; and laser reflected by the reflector plates installed along the circumferential direction is received by the same laser receiver successively to form pulse signals at time intervals, and the deformation of the object is measured according to the change in time interval. The method makes full use of the flexibility of optical devices, is easy to operate and implement, and can be applied to deformation measurement of rotating parts such as aircraft engines and heavy-duty gas turbine blades.

The invention discloses a laser point cloud data-oriented broad-leaved tree real leaf modeling and deforming method comprising the following steps: first, acquiring an accurate leaf border from a scanned leaf point cloud through a polynomial fitting method, and calculating the main vein of the leaf surface based on a computer graphics method; second, fitting leaf surface point cloud data by using a double-cubic generalized tensor product Bezier curved surface to remove scanning error caused by wind shaking and eliminate noise point cloud; and finally, defining different mechanical properties of the veins and mesophyll according to a solid mechanics force model, constructing a stress deformation equation of a nonlinear finite element, calculating the leaf shape after different load forces are applied, and simulating the real deformation of leaves in a natural environment. According to the invention, forestry indexes are acquired by a computer through automatic analysis, and the leaf area index indicating dynamic growth change of standing trees under different forest stand conditions can be described accurately. The method is of certain use value.

The application discloses a blood vessel blood flow simulation method based on a mechanics equation, a blood flow simulation device, and a computer readable storage medium. The method comprises: acquiring feature data of a blood vessel; constructing a three-dimensional model of the blood vessel according to the feature data and carrying out three-dimensional model definition of a calculation area;carrying out discretization processing on the calculation area to generate a grid depicting the calculation area; constructing a physical mathematical model including a fully coupled fluid mechanicsgoverning equation and a solid mechanics governing equation, of the calculation area; on the basis of the grid, calculating the physical mathematical model and acquiring blood flow parameters and blood vessel parameters of the calculation area; and calculating change parameters of the grid based on the blood vessel parameters and thus updating the calculation area. Therefore, accurate and efficient simulation of the blood flow in a blood vessel is realized.

The invention discloses a digital array high-speed image pick-up system aberration correcting method and belongs to the technical field of experimental solid mechanics dynamic testing and high-speed photographic images. According to the digital array high-speed image pick-up system aberration correcting method, an LED (Light Emitting Diode) serves as a light source; a CCD (Charge Coupled Device) camera serves as an image recording device; the digital array high-speed image pick-up system comprises a 3*3 array LED light source unit, a 3*3 array CCD camera unit, a high-accuracy time sequence synchronous delay control unit, an optical imaging unit, an impact loading unit and the like; influence rules of geometrical parameters of the digital array high-speed pick-up system to the aberration is analyzed; flash ranging mechanics dynamic testing analysis is performed after correction of the aberration of images collected by CCD cameras at different positions; the aberration correction method aims at the inherent aberration problem of the digital array high-speed pick-up system and a test result is more accurate.

The invention discloses a solid-liquid coupling physical similarity simulation experiment material. The solid-liquid coupling physical similarity simulation experiment material is mainly prepared fromthe following raw materials according to parts by weight: 100 parts of river sand, 8-10 parts of cement, 2-4 parts of talc powders, 2-4 parts of starch, and 2-4 parts of liquid paraffin. The invention further discloses a preparation method of the solid-liquid coupled physical analog simulation experiment material. The solid-liquid coupling physical similarity simulation experiment material disclosed by the invention has the advantages of extensive sources of the raw materials, low cost, environmental friendliness, nontoxicity, high convenience in manufacturing, high easiness in forming, quicksolidification, stable mechanical performances, high fragility and high hydrophobicity; and the proportioning ratio of the material can be adjusted to change the mechanical properties and the water-physical properties of the material, so that the properties of large-scale rocks can be simulated, the solid mechanical properties and the permeability can be simultaneously simulated, and the simulation similarity is high.

The invention discloses a measuring device for the shearing strength between an ice layer and a solid material on the basis of an experimental section of an icing wind tunnel. The measuring device comprises connecting plates arranged on the upper tunnel wall and the lower tunnel wall of the wind tunnel, wherein an experimental inner model is arranged between the two connecting plates; an experimental outer model is sheathed into the surface of the experimental inner model; the two ends of the experimental inner model are respectively of boss structures; the convex parts penetrate through through holes on the connecting plates and are fixedly connected with facilities at the outer parts of the connecting plates; and a window is arranged on the surface of the experimental outer model and faces the blowing direction of the experimental section of the wind tunnel. The measuring device disclosed by the invention has the advantages that the influence rules of different icing meteorological input conditions on the ice layer and the influence rules of the material characteristics on the adhesion characteristics of the ice layer and the solid wall surface can be realized by utilizing the icing meteorological environment of an experimental platform and the experimental section of the icing wind tunnel and combining experimental methods such as solid mechanics and fracture mechanics and the like with relevant technologies.

The invention relates to a fireproof performance evaluation method of a concrete member of a water-injection hollow steel pipe, comprising the following steps that: finite element models of the concrete member of the water-injection hollow steel pipe are established: the concrete member of the water-injection hollow steel pipe respectively establishes finite element models of a temperature field and a mechanical field, the temperature field establishes the finite element model of the temperature field according to the heat transfer theory and the finite element theory, and the mechanical field establishes the finite element model of the mechanical field according to the heat transfer theory and the finite element theory; the software is adopted to calculate the finite element models: firstly software is adopted to calculate the finite element model of the temperature field, then the temperature field with the obtained finite element is taken into the finite element model of the mechanical field for calculation so as to obtain the mechanical field; the fire resistance period is obtained according to the calculation result; and fireproof measures are designed according to the fire resistance period. The invention adopts the finite element models to carry out modeling on the specific concrete member of the water-injection hollow steel pipe, carries out full consideration on all the materials and can carry out fireproof evaluation of buildings more accurately.

The invention provides a numerical simulation analysis method for dynamic stiffness of a loudspeaker basin stand. The method comprises the steps of firstly building a finite element simulation model comprising the sub-steps of 1, adding a physical field and a research type; 2, building a geometrical model of the loudspeaker basin stand; and 3, setting the physical field; setting an elastic material model, damping, a constraint condition and a loading force in a solid mechanics physical field; 3, setting a material parameter; and 4, setting grid types and sizes, and dividing grids to generate afinite element model; then solving the finite element model by using a frequency domain analysis method; and at last, performing postprocessing to acquire a change relationship of the dynamic stiffness of the loudspeaker basin stand along with frequency. A distribution diagram of the stress, strain and displacement on the basin stand and frequency responses of the displacement amplitude, speed amplitude and acceleration amplitude of any point on the basin stand also can be acquired under the sinusoidal loading effect at any frequency.

The invention discloses a method for measuring the expansion rate of an intrinsic fatigue crack of a welded plate vertical to the weld direction, and belongs to the technical field of solid mechanics. The method comprises the following steps: at first, measuring residual stress horizontal to the weld direction; making a welded plate into a weld containing compact stretch sample, wherein the crack expansion direction is vertical to the weld direction; calculating the stress strength factor of residual stress corresponding to different crack lengths; through a residual stress superposition model, by combining a given constant stress factor range and a constant effective stress ratio, calculating the applied external loads under different crack lengths; carrying out fatigue crack expansion experiments under the calculated external loads, and determining the expansion rate of an intrinsic fatigue crack in a welded member under a given constant stress factor range and constant effective stress ratio. The provided method can directly obtain the expansion rate of an intrinsic fatigue crack in a welded member under a given stress state through fatigue experiments, is simple, and has a high accuracy.

The invention discloses a multi-physical-field simulation modeling method for optical fiber attenuation characteristics in an OPLC cable. The method comprises the following steps: firstly, carrying out geometric modeling on the OPLC; secondly, selecting materials and material parameters corresponding to each structure of the OPLC; thirdly, setting finite element solving conditions, and setting boundary conditions of a current field, a solid heat transfer field and a solid mechanical field; sweeping the section of the OPLC cable after free triangular mesh generation, and then carrying out coupling calculation; then, obtaining OPLC temperature field distribution and strain distribution; and finally, substituting the influence of the OPLC on the temperature and strain of the optical fiber into optical fiber attenuation simulation to obtain attenuation of the optical fiber in the OPLC cable. According to the method, the influence of current, temperature distribution and strain in the operation process of the OPLC cable on the optical fiber attenuation characteristic in the OPLC cable can be obtained more easily through multi-physical field coupling simulation based on the finite element method, the obtained optical fiber attenuation result is more accurate, and the method has important guiding significance for research on optical fiber attenuation in the OPLC cable.

The invention discloses a pavement structure multi-physical field coupling numerical simulation method based on finite element, which comprises the following steps: defining mechanical, thermodynamicand hydraulic parameters; Defining vehicle loads and meteorological functions; Adding a solid mechanics module, applying a load and setting boundary conditions; Adding a porous medium heat transfer module, referring a weather function and setting boundary conditions; Adding Darcy's law module, referring a weather function and setting boundary condition; Adding a multi-physical field coupling module to couple the multi-physical fields; Calculating and performing post-processing analysis. The invention couples the stress field, the temperature field and the hydraulic field, and comprehensively studies the influence of multiple physical fields on the road performance. The invention has good guiding significance for the selection and analysis of the pavement structure.

An embodiment of a method and a program product of the invention has steps of selecting a model from a plurality of models in a model library, with at least one of the models being a constitutive model. Load data and load path data are input to the model to generate model output. The output is then displayed in a graphical format.

The invention relates to a method for optimizing an alloy extrusion process, specifically to an optimization method for a hot extrusion process of powder metallurgical alloy, and belongs to the plastic processing field. According to the method, a constitutive equation of a to-be-extruded alloy is established firstly; next, according to the constitutive equation, the constitutive equation is imported to solid mechanical finite element software; simulation of an extrusion test and analysis of the result are performed through a test design method; and finally, by virtue of statistical analysis and optimization analysis, the influence value of each factor on the extrusion process is obtained, so as to realize optimization of each parameter of the extrusion process. By virtue of reasonable and finite tests, the constitutive equation with extremely high credibility can be obtained; then the constitutive equation is introduced into the statistical and optimization result of the statistical analysis and optimization analysis of the solid mechanical finite element software, and the method for optimizing the alloy extrusion process is established; and the reasonable and practical optimization parameters are obtained, and the method is proved by practices and verification.

The invention provides a multi-spark type high-speed photographic digital image array recording system and method, belonging to the field of a dynamic testing technology of experimental solid mechanics and a high-speed photographic image technology. The high-speed image array recording system taking a CCD (charge coupled device) array camera system as a multi-spark type high-speed photographic photosensitive plate comprises the CCD array camera system, a multi-spark type array point light source and sequential control synchronous system, a computer data processing system and the like. By adopting an optical design, light from each multi-spark type array point light source passes through a first imaging lens to lighten tested materials, and then passes through a second imaging lens to form images on the corresponding CCD array camera system. Compared with a traditional film recording system, the recording system provided by the invention can automatically acquire and process high-speed images, thus reaching the purposes of saving labor, simplifying operations and avoiding chemical pollution of processing films.

The invention discloses a fluid finite element-based large-deformation elastomer product static stiffness calculation method. The method comprises the steps that a fluid model is built according to anoverall area obtained before and after an elastomer material of a target product deforms; the fluid model is subjected to fluid mesh generation, and parameters of the built model are given to the elastomer material in fluid units; on the basis, an initial distribution area when the elastomer material does not deform is obtained through partitioning, wherein the initial area is set to be the areawhere the elastomer material is distributed, and the other remaining area is set to be the area where the elastomer material is not distributed; after a model of the elastomer part of the product is built by means of fluid finite elements, the other part of the product is modeled according to a classical continuous solid mechanic finite element technology through the steps of contact setting, boundary condition setting and load setting, and then model building of the overall product is completed; and the displacement and the related constraint reaction of the product are calculated and jointlysolved, and then the static stiffness of the target product can be obtained. According to the method, the static stiffness of the elastomer product can be solved under any large elastomer deformationoperating condition.

The invention belongs to the fields of material science, high-temperature experimental mechanics, solid mechanics and the like, and relates to a material controllable high-temperature test device andmethod based on laser irradiation. The device comprises a material testing machine system, a test piece clamping device, a test piece heating device, a test piece temperature measuring device and a test piece strain measuring device. The mechanical property test and calibration of various materials at high temperature are met, and the technical problems of low temperature control precision, low efficiency, high requirements on a clamping device and the like of a material high-temperature experiment at the present stage are solved.

The invention relates to a perforated pipe for consolidating foundation. A long oil pipe assembly is disposed in the center of a main pipe of the perforated pipe, two ends of the main pipe of the perforated pipe are fixedly connected with a long adapter assembly and a short adapter assembly in a sealing mode, and the other end of the long adapter assembly is fixedly connected with a short oil pipe assembly in a sealing mode. The perforated pipe is provided with fifteen holes, wherein four holes are threaded holes for being connected with the assemblies, three holes are used for venting, two holes act on a mud disposal shutter switch and oil flows through the two holes, two holes are drilling holes and water flows through the holes; a sensor wire is inserted in one hole, pulp flows through one hole, and muddy water flows through one hole. The perforated pipe does not break or crack under 10KN*M torsion, can work normally in rather severe environment, sealing property of the perforated pipe meets design demands, namely, hydraulic energy does not lose when a plurality of perforated pipes are connected together. Further, the perforated pipe satisfies practical applicability of metro jet system (MJS) construction method no matter on solid mechanics or fluid mechanics.

The invention relates to an ultrasonic elastography simulation method based on multi-physical field coupling. The method comprises the following steps: performing coupling simulation on a sound fieldand a solid mechanical field in Comsol Multiphysics simulation software; firstly, completing simulation of a sound field by utilizing an acoustic module; extracting a radio frequency echo signal RF1;calculating acoustic radiation force according to acoustic characteristic parameters in the sound field simulation solving result, applying the acoustic radiation force to the solid mechanical field to obtain responses such as displacement generated when the acoustic radiation force acts on the medium, analyzing information such as displacement and shear wave velocity of the solid mechanical field, and completing positive problem simulation of the ultrasonic elastography method; and re-applying the geometry which generates deformation to an acoustic module for solving to obtain another group of radio frequency echo signals RF2 after the measured object field generates deformation, and using the two groups of echo signals for solving the inverse problem.

The invention, which relates to fields of the building composite material, the sensor, the engineering detection, and solid mechanics, discloses a high-performance micro-prestressing-force thermoplastic intelligent fiber rod and a manufacturing method thereof. The fiber rod comprises a sensing fiber (10) and a thermoplastic rod body (20). The outside of the sensing fiber (10) is coated with the thermoplastic rod body (20). The sensing fiber (10) is a communication fiber with an applied micro-prestressing force; and the thermoplastic rod body (20) is a high-polymer-material-based coating element. The intelligent fiber rod has the following advantages: firstly, the weight is light, the density is 1900kg / m<3>, the rigidity and flexibility are high, and the fiber rod also has corrosion-resistant, magnetism-free, electric insulation, eddy-loss-free, and eddy-interference-free functions; secondly, the intelligent fiber rod belongs to the passive sensor field and does not need a power supply, so that a problem of electrode corrosion can be solved; and thirdly, the service life is long; the base material thermoplastic unit is arranged inside the structure and isolated from the fiber and air, so that the service life is prolonged; and the functional material fiber is a piece of glass essentially and has the service life equal to the structure.