122 results about "Micromechanics" patented technology

The invention relates to a micro material mechanical performance testing platform under stretching-bending-twisting multi-loads, and belongs to the field of electromechanics. The micro material mechanical performance testing platform comprises a tension and compression module, a bending module, a twisting module, a detection control module and a test-piece clamping module, wherein the testing platform takes the tension and compression module as a basic function module; the twisting module is arranged at one end of the tension and compression module; the test-piece clamping module is arranged on the tension and compression module; the bending module is independently arranged at one side of a portal frame. The micro material mechanical performance testing platform can be taken as a material mechanical performance test device with an independent stretching/compressing mode or an independent bending mode or independent twisting mode, namely a single load testing mode, and can be applied to a material mechanical performance test of a twisting load under the given stretching/compressing stress level or a material mechanical performance test of a bending load under the given stretching/compressing stress level, namely a composite load testing mode. The stress strain process of a material under the effect of a composite load can be detected by the collection of a load/displacement signal by using the detection control module.

An in-situ testing equipment for testing micromechanical properties of a material in a multi-load and multi-physical field coupled condition is disclosed. The equipment comprises a frame supporting module, a tension/compression-low cycle fatigue module, a torsioning module (21), a three-point bending module (6), an impressing module (33), a thermal field and magnetic field application module (34), an in-situ observation module (32) and a clamp body module (22). The frame supporting module provides a structural support for the whole testing equipment, the tension/compression-low cycle fatigue module is arranged at upper and lower ends of the testing equipment, the torsioning module (21) is directly arranged at a front end of the tension/compression-low cycle fatigue module, the three-point bending module (6), the impressing module (33) and the thermal field and magnetic field application module (34) are disposed on a support post at one side of the whole testing equipment through a common replacing component, and the in-situ observation module is disposed on another support post at the other side of the testing equipment. The clamp body module is connected to a front segment of the torsioning module, so as to clamp a test piece. An overall structure of the testing equipment is configured in a vertically symmetrical arrangement achieved by using four support posts. Two identical servo hydraulic cylinders (10) and two torsioning modules (21) are located at the upper and the lower ends of the testing equipment respectively and are used to perform a symmetrical tension/compression test and a symmetrical torsion test on the test piece (23) positioned centrally. The testing equipment is capable of realizing applications of five different types of loads including tension/compression, low cycle fatigue, torsion, bending and impressing, performing an intensive study on micromechanical properties of the material in the multi-load and multi-physical field coupled condition by using built-in electric, thermal and magnetic application modules and the in-situ observation module, and acquiring relations between deformation behavior, mechanism of damage, performance weakening of the material, applied loads and material properties.

The invention relates to an in-situ pull/press-torque combined load material micromechanics test platform and belongs to the field of material mechanics tests. The in-situ pull/press-torque combined load material micromechanics test platform consists of a base, a precise loading unit, a detection control unit and a clamping and connecting unit, wherein the precise loading unit comprises a torque loading unit and a pull-press loading unit and can be used for realizing the independent and combined loading of pull-press loads and torque loads; aiming at the pull-press loads and the torque loads, the detection control unit respectively uses a pull pressure sensor and a torque sensor to perform load detection and is combined with a contact-type capacitance displacement sensor, a circular grating ruler and a photoelectric encoder so as to monitor and control a loading mechanism. The in-situ pull/press-torque combined load material micromechanics test platform is compact in structure, small in size and controllable in strain rate, and can be used for performing in-situ monitoring on microtexture structural changes, deformation damage mechanisms and performance evolution laws of a material under the action of the combined load, so that an effective test method for revealing the nanoscale mechanics characteristics and damage mechanisms of the material under an approximate service condition is provided.

The invention discloses a prediction method for the fatigue life of a complex braided structure ceramic-based composite material.The prediction method comprises the steps that the fatigue performance under a cycle number and the fiber failure percentage under the cycle number are calculated; the relationship between the fiber failure percentage and a fiber failure critical value is determined; the unit-cell scale fatigue performance is calculated to obtain the maximum strain epsilon'max under the cycle; the relationship between the maximum strain epsilon'max and the maximum failure strain epsilonmax is determined; a fatigue life curve of the material is obtained.According to the prediction method, a microscale model taking account of fibers, a base body and pores and a unit-cell multi-scale prediction model taking account of warp yarn, weft yarn and holes are presented and overcome the defects that a micromechanical method cannot be directly applied to the braded material with the complex structure, and a macroscopic phenomenological method depends on a large quantity of tests and only can achieve prediction on the fatigue life of a special material, macromechanics and micromechanics are combined, a micromechanical stress strain field of a complex braided structure is supplied, and the application range of the material is widened while the fatigue life curve of the material is precisely predicted.

A system to predict a fatigue life of an aluminum alloy is disclosed herein. The system comprises a computer-readable medium cooperative with micromechanics-based fatigue life models for cyclic multiaxial loading. The fatigue life models predict the fatigue life by processing information received by the system relating to the aluminum alloy and the stress state present in the aluminum alloy. The received information comprises at least one of: a critical shear plane, a damage factor, a hardening factor defined by at least one of a plurality of uniaxial cyclic hardening factor parameters related to probabilistics of defects and microstructure characteristics in the aluminum alloy, an additional hardening factor related to non-proportionality, and thermophysical and mechanical properties of the aluminum alloy. The defects and microstructure characteristics can be calculated using mathematical modeling of casting, solidification and heat treatment processes or by an extreme value statistics based on metallography measurements.

The invention relates to a combined measuring device for the mechanics index of the cloth and yarm and it use. It includes a step motor and a computer with a stretching force sensor, a signal gathering and program driving control module and a data collection chart, a pair of clamper which can adjust the position and tension set on the movable board1, a double needle pressing machine4; a single fixed pointed keeping needle suspended on the pull sensor5; two touch touching pachometer. The characteristics of the invention lies in that the overall measurment of the weight, bend, stretching, friction, stretch relaxation, compress thickness and shear property of the cloth and yarm can be completed in mobil way at one time, besides, the invention provides a simple mechanism and compact and light and handy structure, adapting to be fitted onto the stretch test instruments of various types of micromechanics measuring sensors.

The invention relates to a stretching, compression and bending combined load mode material mechanics performance test device under a microscope, and belongs to the electromechanics. A test platform includes a precision stretching/compression load driving unit, a precision bending load driving unit, a clamping unit, a detecting unit and the like. The test platform can be used for the sole stretching/compression test, sole three-point bending test, and the stretching/compression-bending combined load test. The invention has the advantages that the structure is small and compact, and the tests can be performed under the real-time observation of the optical microscope; the loading mode of the combined load is in conformity with the stress state of material and members under the actual workingcondition, and combined with the optical microscopic imaging system, deepgoing study on the micromechanics behavior and denaturing impairment mechanism of the material under the action of combined load can be carried out.

An apparatus for achieving in-situ micromechanics, microstructure and component integrated research in a scanning electron microscope belongs to the field of material microstructure and performance in-situ characterization. According to the apparatus, a double trapezoid leading screw transmission system is adopted, thus the apparatus is large in rigidity and high in test precision; the apparatus can stably operate in the scanning electron microscope, has low mechanical noise, and has low interference on scanning electron microscope imaging; the trapezoid leading screw has a self-locking function, thus the test can be paused and started at any time, continuity of test data is good; a sample clamp has a rotation function, thus when material extension/compression mechanical properties are measured, scanning electron beam imaging, EDS and EBSD integrated test can be satisfied at the same micro area; clamp support frames designed by the apparatus, the sample clamps and samples have the completely symmetrical structure, thus the samples receive the completely symmetrical extension/compression stress, and a geometric center of the sample, i.e., a deformation center, is located right under an electron beam all the time, thereby facilitating in-situ tracking dynamic research and high-quality microscopic scanning image acquisition.

The invention discloses a method for constructing a graded crushed rock micro-mechanical model and calibrating a micro-mechanical parameter. The graded crushed rock micro-mechanical model is constructed through a test on a graded crushed rock basic parameter, simulation of a test mold and generation of the simulation test piece by endowing the micro-mechanical parameter to a simulation test piece; a micro-mechanical model test piece is subjected to a value experiment, so that a graded crushed rock stress strain curve is obtained through stimulation; and the micro-mechanical parameter of the graded crushed rock micro-mechanical model can be calibrated by analyzing the comparison between an actual test result and a simulation structure of graded crushed rock stress strain according to a simulation error precision requirement. By the method, the graded crushed rock micro-mechanical model can be constructed accurately and quickly and the micro-mechanical parameter can be calibrated, so that an effective tool is provided for deep research on a mechanical behavior and a damage mechanism of graded crushed rocks.

The invention relates to a test-piece clamp for multi-load coupling loading and a multi-physics field coupling loading method thereof, and belongs to the field of material micro-mechanical property testing. By machining a groove in the clamp, putting a test piece into the groove and compacting through pressing plates, application of stretching, bending, torsion, and other mechanical loads onto the test piece by the clamp is achieved. Conductive heating is performed by bringing a silicon nitride heating sheet and the test piece into contact, and temperature feedback is achieved by a thermocouple, thus achieving application of thermal-field loading onto the test piece to be tested. Electric-field loading to the test piece is achieved by providing the test piece with a controllable electric current. Magnetic-field loading to the test piece to be tested is achieved through two magnetic induction coils. The structure is simple and compact, the method is scientific and reasonable, and properties are stable and reliable. Large-range temperature loading, accurate electric current loading and controllable magnetic field loading for a test piece material to be tested can be achieved. Composite-load loading and stimulation of a thermal field, an electric field and a magnetic field, which are closer to service conditions, for material testing can be provided. The test-piece clamp and the method have important theoretical significance and application value.

The invention relates to the field of damage prediction of a composite laminate, aiming at providing a multi-scale prediction method for progressive failure of a composite laminate under low-velocityimpact. The method comprises the following steps: establishing a low-velocity impact finite element model containing a punching hammer, a composite laminate and a support plate; establishing a multi-scale prediction method of composite materials based on micromechanics; solving stress, strain and damage of the composite laminate under s low-velocity impact load based on a multi-scale method; and calculating the low-velocity impact to further obtain the impact force, displacement, velocity and acceleration. A macroscopic progressive failure behavior is predicted from a microscopic point of view; and compared with a research method based on the macromechanics theory of a composite material, the invention considers the influence of the difference of mechanical properties of microscopic fibersand matrixes on the macromechanics properties of the composite laminate, and more essentially and more accurately predicts the progressive failure behavior of the composite laminate under the low-velocity impact load.

The invention relates to a material mechanical property in-situ three-point bending test platform with adjustable test environment temperature, and belongs to the field of in-situ mechanical property test. Test elements are heated up through resistance wires, and are observed by combining with a high-amplification-factor solid state CCD (charge coupled device) industrial imaging lens, and the microstructure variation as well as micromechanics behaviors of crack production, expanding and the like of materials at different environment temperatures under the bending load effect can be monitored dynamically. The material mechanical property in-situ three-point bending test platform with adjustable test environment temperature provided by the invention mainly comprises a precision driving transmission unit, a detecting unit, an imaging system unit, a temperature field control unit and an auxiliary support unit. The material mechanical property in-situ three-point bending test platform with adjustable test environment temperature has the advantages that the structure is simple and compact, the transmission is stable, and a temperature field and stress field are effectively combined, in-situ observation can be carried out on micro deformation, damage and cracking process of materials under a high-resolution imaging system, and thus a novel test method is provided for revealing the mechanical property and the damage mechanism of materials under different temperature fields.

The invention discloses an in-situ high temperature micromechanics testing device in a scanning electron microscope. The device comprises a control system, an extension testing device, a heating device and a fixing device, wherein the extension testing device is provided with a containing space, and the heating device is arranged in the containing space; the bottom ends of the extension testing device and the heating device are respectively connected with the fixing device; the bottom end of the fixing device is fixedly connected with a sample support frame of the scanning electron microscope; the extension testing device, the heating device and the fixing device are all fixed in a chamber of the scanning electron microscope; the scanning electron microscope, the extension testing device and the heating device are respectively and electrically connected with the control system. The testing device provided by the invention is compact in structure, and can be conveniently installed in the microscope; by arranging the heating device, a test can be carried out under the condition of high temperature load; after the testing device is adopted, the in-situ imaging dynamic observation on a test sample under the actions of high temperature load and stress load is conveniently realized by using scanning electron beams, and the composition information spectrum and crystal structure information graph of the sample in the same observation micro area can be acquired at the same time.

A method of producing a semiconductor component, e.g., a multilayer semiconductor component, and a semiconductor component produced by this method, where the semiconductor component has, e.g., a mobile mass, i.e., an oscillator structure.

A method easily and inexpensively produce a micromechanical component having monocrystalline oscillator structures, such as an acceleration sensor or a rotational rate sensor for example, by surface micromechanics, a first porous layer is formed in the semiconductor component in a first step and a cavity, i.e., a cavern, is formed beneath or out of the first porous layer in the semiconductor component in a second step.

The invention discloses a rock mechanics and reservoir engineering parameter evaluation method, and belongs to the technical field of rock mechanics. The rock mechanics and reservoir engineering parameter evaluation method comprises the following steps: performing X-ray diffraction on rock debris to obtain mineral components and contents of the rock debris; performing CT scanning on the rock debris, performing observation under a microscope, and obtaining the microstructure characteristics of all mineral particles of the rock debris; carrying out a micro/nano indentation test on the rock debris, and determining the micromechanical parameters of each mineral component of the rock debris; constructing a three-dimensional calculation model according to the rock debris microcosmic characteristic gene, and taking a representative volume unit to obtain rock macromechanics parameters; and evaluating the engineering parameters of the field requirements according to the rock macromechanics parameters and the engineering parameter evaluation model. The rock mechanics and reservoir engineering parameter evaluation method can effectively and accurately obtain engineering parameters required onsite and is of great significance to design and optimization of on-site drilling and fracturing engineering.

The invention relates to the technical field of micro fluid transmission and control and micromechanics, in particular to a valveless piezoelectric pump based on a wall attachment effect. According to the adopted technical scheme, the valveless piezoelectric pump comprises a pump body, a pump cover and piezoelectric vibrators, wherein the pump body is bonded with the pump cover; the piezoelectric vibrators are fixedly arranged above the pump cover; a pump inlet and a pump outlet are formed in the pump cover; the pump body is provided with a pump cavity, an inlet cavity, an outlet cavity and a three-way tube; the inlet cavity is communicated with the pump inlet; the outlet cavity is communicated with the pump outlet; two shunting tubes of the three-way tube refer to an inlet flow tube and an outlet flow tube respectively; the inlet flow tube is communicated with the inlet cavity; the outlet flow tube is communicated with the outlet cavity; and a converging tube of the three-way tube is a planar conical tube, and is communicated with the pump cavity. The valveless piezoelectric pump is characterized in that a tube wall, which is close to the outlet flow tube, at a position with a smallest section on the converging tube is in round corner transition connection with the pump cavity, and a tube wall which is close to the inlet flow tube is in pointed angle connection with the pump cavity. The valveless piezoelectric pump has the beneficial effects of simple structure, easiness in minimizing, and over 50 percent of the pump volume efficiency.

In a mass flow sensor having a layered structure on the upper side of a silicon substrate (1), and having at least one heating element (8) patterned out of a conductive layer in the layered structure, thermal insulation between the heating element (8) and the silicon substrate (1) is achieved by way of a silicon dioxide block (5) which is produced beneath the heating element (8) either in the layered structure on the silicon substrate (1) or in the upper side of the silicon substrate (1). As a result, the sensor can be manufactured by surface micromechanics, i.e. without wafer back-side processes.

The invention relates to an in-situ instrument for micromechanics performances of materials under three-point and four-point bending action, belonging to the technical field of micromechanics performance test of materials. The in-situ instrument belongs to an electro-mechanics integrated precise test instrument for micromechanics performances of materials. A direct-current servo motor is connected with a worm wheel and a worm; after slowing-down torque increasing is realized, a lead screw is driven by virtue of a secondary worm and gear transmission mechanism; after combination of the support of a foundation bed, a precise slide block is driven by the lead screw to move a bent head; and by combining the co-action of supporting units of a test sample, three-point bending and four-point bending experiments are realized. The in-situ test instrument for the micromechanics performances of the materials under three-point and four-point bending action has the advantages of a small size, a compact structure, light weight, good dynamic characteristic and low energy consumption. A sensor is directly arranged on the instrument foundation bed, so that the test precision is sufficiently guaranteed; meanwhile, the spacing between the bent heads at the two sides can be regulated, a three-point bending pressure head and a four-point bending pressure head are convenient to dismount, simple to exchange, and vertical structural arrangement is adopted, so that the condition that the instrument can be compatible with an objective table structure of commercial material property characterization instrument equipment is facilitated.

A double-tilt in-situ mechanical sample holder for TEM based on piezoelectric ceramic drive belongs to the field of material microstructure-mechanical properties in-situ characterization, and it comprise two parts of sample holder shaft body and piezoelectric ceramic drive system. The sample holder shaft body comprise tilt stage, sample holder, linear stepping motor, drive rod, drive linkage. The piezoelectric ceramic drive system comprise piezoelectric ceramic loading stage, piezoelectric ceramic, connecting base and the sample loading stage realizing stretch or compression function. The double-axis tilt of the samples in X and Y axis directions is realized by the reciprocating motion back and forth of the drive rod driven by the linear stepping motor. The stretch or compression of the samples is realized by applying voltage on the piezoelectric ceramic to generate displacement and push the sample loading stage by the connecting base. The invention coordinating with high resolution TEM realizes the observation of the microstructure in atomic and even sub angstrom scales, and at the same time it ensures the controllable deformation of nanomaterials, further realizes the integrative research on the material microstructure-mechanical properties and reveals the deformation mechanism of the materials.

The invention relates to manufacturing technology of high pressure hydrogen storage cylinders, and provides a method for predicting a burst pressure of a fully fiber wound composite material gas cylinder. The method comprises the following process: establishing a finite element model of the fully fiber wound composite material gas cylinder containing a seal head with variable thickness and variable angle; establishing a multi-scale model of the composite material based on the micromechanics; and performing progressive failure analysis on the composite material gas cylinder based on the multi-scale model by using an ABAQUS-UMAT, namely ABAQUS user static material subroutine module that is complied by the FORTRAN language, and figuring out the burst pressure. According to the method provided by the invention, the damage of the fibers and the matrix components are judged from the micro perspective, and the damage variables are calculated, compared with the traditional phenomenological macro failure criteria, the method has the advantages that the failure mode of the composite material can be determined more accurately, the material parameter to be determined are less, and thus the progressive failure analysis can be carried out on the fully fiber wound composite material gas cylinder efficiently and accurately to obtain the burst pressure.

The invention provides a soil anisotropic mechanical property research idea and method from the microscopic point of view by developing a horizontal loading program and a micro-mechanical parameter monitoring program through a particle discrete element unit method. The method includes the steps of (1) obtaining stress-strain curves and related mechanical parameters of cohesionless soil according to laboratory tests; (2) establishing a plane biaxial specimen to simulate soil original anisotropy according to micromechanics parameters determined in a particle flow biaxial test in step (1); (3) establishing a plane biaxial specimen to simulate soil stress anisotropy according to the micromechanics parameters determined in the particle flow biaxial test in step (1); (4) comparing and analyzing expression rules of soil original anisotropy and the soil stress anisotropy to obtain the difference and relation between the two kinds of anisotropy and finding out microscopic mechanisms of the production of the two kinds of soil anisotropy. The soil anisotropic mechanical property research idea and method provides a new idea for the cohesionless soil anisotropic mechanical property numerical simulation by using the advantages of the particle flow discrete element method in the research of the particulate material microstructure.

The invention provides a multifunctional motor vehicle detecting instrument and a detecting method thereof, and belongs to vehicle-mounted fault diagnosis systems in the automobile electronic technology. The multifunctional motor vehicle detecting instrument is mainly composed of two parts. The first part is wheel posture collectors, each wheel posture collector is mainly composed of an MEMS micromechanics inertia navigation module, a microprocessor, a wireless Bluetooth sending module, a special clamp and a wheel in a fixing mode, and each wheel is provided with one wheel posture collector. The second part is a portable main machine instrument which is mainly composed of a wireless Bluetooth wheel signal receiving module, a vehicle-mounted posture sensor, a pedal force collecting module, a microprocessor, a GPS communication module, a 3G/GPRS communication module, a displayer, a printer, a vehicle-mounted power source and a vehicle-mounted power charger. The obvious advantages of safety, accuracy, convenience and high efficiency of the multifunctional motor vehicle detecting instrument are achieved in the using process, and important significance is achieved on the aspects of maintaining road traffic orders and preventing and reducing traffic accidents.

The invention discloses a shale uniaxial compressive strength evaluation method based on a rock debris micro-nano indentation experiment, and the method comprises the following steps: collecting rockdebris of a target shale reservoir, and treating the surface of a rock debris sample by adopting a three-ion beam cutting instrument, so that the surface becomes a flat and smooth high-quality section; carrying out a rock debris micron or nano indentation experiment on the treated rock debris sample to obtain a plurality of groups of indentation experiment load displacement curve graphs; and calculating the shale uniaxial compressive strength of the shale reservoir. According to the method, the shale debris micro-nano indentation experiment is carried out, indentation load depth curves under different scales are obtained, micromechanics parameters of shale are obtained through calculation, a relation model between uniaxial compressive strength and the micromechanics parameters is established, prediction of macromechanics parameters of shale is achieved, and the method is suitable for large-scale popularization and application. Therefore, shale mechanical parameters of the shale horizontal well are accurately obtained; basic parameter bases are provided for drilling, well completion and hydraulic fracturing of the shale gas horizontal well, and design and construction of drilling, well completion and hydraulic fracturing of the shale gas horizontal well can be effectively guided.