885 results about "Temperature stress" patented technology

The invention discloses a production process for an intelligent temperature adjusting steel rail with a laser cladding layer and a heat insulation coating. The production process comprises the following steps of: (1) cladding the laser cladding of one layer or superposed inner and outer two-layer structures in thickness of 0 to 4 millimeters on the surface of the steel rail by adopting the laser cladding technology, wherein the laser cladding layer consists of mixed powder formed by mixing alloy powder and ceramic powder comprising oxide powder or/and nickel clad oxide powder in a certain ratio; (2) performing slow cooling treatment on the surface of the steel rail; (3) moderately performing surface treatment and drying treatment on the surface of the steel rail; and (4) coating a functional coating with corrosion resistance, abrasion resistance, heat insulation performance, heat dissipation and cooling performances and intelligent temperature adjustment function at normal temperatureon the surface of the steel rail. The steel rail has corrosion resistance, abrasion resistance and good electric conductivity, the cost of the steel rail can be saved, and the service life of the steel rail is long; and the steel rail can insulate heat and reduce temperature, the temperature stress of the steel rail can be greatly reduced, and the safety of train transport is improved.

PCT No. PCT/JP96/02067 Sec. 371 Date May 28, 1997 Sec. 102(e) Date May 28, 1997 PCT Filed Jul. 24, 1996 PCT Pub. No. WO97/05495 PCT Pub. Date Feb. 13, 1997A semiconductor device testing apparatus having a reduced transverse width and compact in size is provided. Adjacent to a constant temperature chamber 101 containing therein a vertical transport means is located a test chamber 102 which is in turn adjoined by a temperature-stress removing chamber 103 likewise containing therein a vertical transport means, so that the constant temperature chamber 101, the test chamber 102 and the temperature-stress removing chamber 103 are arranged transversely in a line. Further, a loader section 300 is located in front of the constant temperature chamber, and an unloader section 400 is located in front of the test chamber and the temperature-stress removing chamber. With this arrangement, the transverse width of the testing apparatus may be reduced to about three test tray lengths.

The invention relates to a method for producing ceramic hollow fibers from nanoscale particles and to hollow fibers produced in such a manner. The inventive method is characterized in that the ceramic material has a solids content of >25% by volume, preferably >30% by volume and is processed by means of extrusion and spinning. The hollow fiber is sintered according to conventional sintering methods. A hollow fiber produced in this manner is used for metal, polymer and ceramic matrix reinforcements, for artificial organs, for microsystems technology components, for fiber optical waveguides, for ceramic membranes, for solid electrolyte in fuel cells (SOFC), for tissue engineering and for producing extremely light ceramic parts, such as heat shields or brake systems, that are subjected to temperature stresses. The inventive ceramic batch can also be processed by means of silk screening whereby resulting in the production of filigree structures over the ceramic silk screening.

The invention discloses a system for testing rock damage and permeability under the coupling effect of temperature stress and circumferential seepage. The system comprises a frozen-heave force test device and a permeation test device, wherein the permeation test device comprises a pressure chamber for loading a rock test piece to be tested, a pressure loading device, a permeation pressure increasing and measuring device, a water bath heating device, an ultrasonic damage test device and a data acquisition device. The invention further discloses a method for testing rock damage and permeability under the coupling effect of temperature stress and circumferential seepage. The method comprises the following steps: carrying out repeated freezing-thawing tests on a rock by the frozen-heave force test device, measuring the frozen-heave force change of the rock test piece, putting the rock into the pressure chamber, applying a pressure to the rock test piece by the pressure loading device, and testing a rock permeation coefficient k and ultrasonic wave speed transmission time t under the action of flowing liquid with different temperatures and pressures so as to make a research on rock damage and permeability.

The present invention provides a real environment-based concrete cracking whole process test apparatus and test method, a main testing machine includes an environmental tank and a concrete specimen containing device arranged in the environmental tank, a specimen is placed in the concrete specimen containing device, a load system is connected with a movable clamp head on the concrete specimen containing device, and simulated real environment is provided in the environmental tank. The method comprises restraining stress, free variables, elastic modulus, deformation separation, and creep and other tests. In the whole process from pouring to hardening of test concrete, under a variety of temperature control conditions, the self temperature stress development process includes adiabatic temperature rise, thermal expansion coefficient, elastic modulus and creep and other parameter development process over time, a real meteorological environment can also be simulated, and temperature stress and cracking mechanism affected by natural factors are simulated. The device can set, according to the needs, different temperature and constraint conditions including thermal isolation, constant temperature, setting of the temperature rise and drop processes, and the like. Through the concrete cracking whole process simulation, concrete crack resistance can be evaluated.

The invention discloses a reliability acceleration test method of electronic products, and belongs to the field of reliability designing and testing. The method comprises steps of firstly presetting an acceleration test temperature change curve boundary according to working stress limit obtained via a routine test for reliability of an electronic product, carrying out simulating calculation of temperature acceleration factors, and modifying and determining initial acceleration test temperature stress change curves; and secondly, calculating vibration acceleration factors according to the initial acceleration test temperature stress change curves and a test profile of the routine test for the reliability of the original electronic product, calculating acceleration test vibration stress change curves according to the vibration acceleration factors, and according to the acceleration test vibration stress change curves, determining the final temperature stress change curves and determining acceleration test time. According to the invention, by following the thought of testing and examining working stress of a product and properly increasing test stress level, test time is shortened; a reliability test of the electronic product can be accelerated; and diversity and controllability of the acceleration factors are achieved.

The invention discloses a constant-temperature stress corrosion testing device and method for an FRP (fiber reinforced polymer) tendon. The device comprises a stretch-draw frame, threaded anchors, a three-way pipe, a spring, a counter force frame, a lifting jack, a force sensor and a stretch-draw anchor rod. Certain stretch-draw stress is applied to the FRP tendon by utilizing the stretch-draw frame, the counter force frame, the lifting jack and the force sensor, and the FRP tendon is fixed by a nut, and the stress loss is compensated by the compression spring, and the constant stress level can be kept for a long time. A corrosion solution soaking environment is provided through a method that a corrosion solution is filled into a home-made PVC pipe device fixed in the middle of the FRP tendon, so that the FRP tendon is in the corrosion solution soaking environment for a long time. After the corrosion solution is filled completely and the prestress is stretched and drawn, the whole stretch-draw frame for stretching and drawing the FRP tendon is put into a constant-temperature constant-humidity test box so as to guarantee the long-term constant-temperature environment. After the constant-temperature corrosion, the device is unloaded through the steps the same with the stretch-draw step, the FRP tendon is taken down for a stretch test. The method comprises the following steps of: anchoring the FRP tendon, fixing through stretching and drawing, corroding at constant temperature, unloading and carrying out the stretch-draw test.

The invention discloses a method for remote sensing estimation of net primary productivity of plants. The method comprises the steps of performing data pre-processing on remote sensing data; extracting LAI data of an MODIS product in the remote sensing data, and calculating an FPAR; calculating astronomical radiation total Q0 according to geographical location information of a research area including longitude and latitude and date; extracting an empirical coefficient according to conventional global radiation and sunshine percentage data of the research area; using Q0 and the empirical coefficient to calculate solar total radiation quantity SOL; calculating photosynthetically active radiation (APAR) according to the FPAR and the SOL; extracting soil water content and an empirical parameter in the remote sensing data, calculating current leaf water potential, and calculating water stress factor in combination with the previous empirical coefficient; extracting temperature data in the research area in meteorological data, calculating temperature stress factor f1(Ta); calculating solar energy utilization rate epsilon according to f1(Ta), and the maximum solar energy utilization rate; and calculating net primary productivity (NPP) according to the APAR and epsilon. The method has the advantages of being high in estimation precision.

The invention provides a face brick for decorating a building wall and a production technique, in particular to a decorative face brick adhered on the outer surface of a heat-insulating system of an external wall and the production technique of the face brick. The face brick adopts high molecular polymer and cement as gelled materials, quartz sand and/or calcium carbonate as aggregate, and acrylic acid polyurethane resin as glazed face. The face brick consists of polymers formed by cement and high molecular polymer particles, and has high strength, high tenacity, excellent resistance to pollution and light mass; the brick can release the temperature stress slowly and is easy to be cleaned. The production technique is simple and is suitable for large-scale production.

A high-temperature annealing treatment resistant single-component chromium-free aqueous silicon steel sheet insulated masking liquid is characterized in that the main ingredients include organic resin, inorganic water dispersion liquid, curing agent and other additives. The weight ratio of the components is as follows: 100 parts of the organic resin, 100-400 parts of inorganic matter, 5-30 parts of the curing agent, 1-20 parts of additive surface active agent and the rest of water, and the solid content of the masking liquid is 30-50 percent. The masking liquid does not contain toxic organic solvent and chromate, has excellent performances of coating appearance, adhesion, salt spray resistance, insulativity and the like, and can still keep good insulativity after going through high-temperature stress annealing process. After a high-temperature annealing experiment (nitrogen atmosphere, 750 DEG C/2h), the interface resistance retention value is more than 70 percent. The curing speed of the masking liquid is fast, the curing is thorough, and the surface of the membranous layer does not turn sticky for a long time of placement after curing. The masking liquid is in the form of single component, has convenient use and can be stored for long time.

The invention relates to a method for testing the acceleration reliability of an antiskid brake control box of an airplane. Temperature stress, vibration stress and humidity stress are comprehensively applied, and an electrifying working condition capable of stimulating a fault is selected in a test process, thus the working frequency of the control box is improved, the fault hidden trouble of the control box is stimulated, and the test time is shortened. The test process is carried out according to a test cross section in a circulating way until the required reliability index is met. In the method provided by the invention, the electrifying working condition and the working frequency in service are converted into the test time, and the working frequency adopted in the test process is higher than the actual working frequency in service. After the test is finished, the met reliability index is evaluated according to a method in GJB (Guo Jun Biao) 1407 and the confidence degree recommended in GJB1407, and the confidence degree for evaluating the reliability index is 90%. In the method provided by the invention, a pulsating current of 0-40mA is applied, fault hidden troubles of the control box in various working conditions are verified, an acceleration reliability test on the control box is realized, and test data can be used for evaluating the reliability index of the control box.

The invention relates to an accelerated life test method of an aircraft brake system. The environment conditions of applying temperature stress, vibration stress and the like in a combined way are adopted, the operating conditions are added and the operating frequency of the whole system are increased during the test process, so that the hidden fault dangers of the brake system are stimulated, and the test time is shortened. The method is circularly carried out according to the test profile during the test process until the required reliability index is reached. The power-on operating conditions, the brake applying pressure operating conditions and the rotating speed change conditions in use are converted into the test time according to the applied operating frequency, and the operating frequency adopted in the test is greater than the actual operating frequency in use. The reached reliability index is assessed according to the method in GJB1407 and recommended degree of confidence after the test is finished, and the degree of confidence for assessing the reliability index is 90%; and the empirical coefficient of life assessment is 1.5. The purpose of performing the accelerated life test on the brake system is realized by verifying whether the brake system has hidden fault dangers under various operating states.

A metallic seal includes a cold formed substrate layer and one or more additional layers. At least one of the layers offers improved resistance to high temperature stress relaxation.

The invention discloses a temperature rise strain monitoring and alarming and fault analysis method for a composite submarine cable. The method comprises the following steps of: performing real-time temperature stress sensing on the composite submarine cable by utilizing abundant single mode fibers in a submarine cable, and evaluating the safety state of the composite submarine cable according to a power supply harmonic test parameter to realize real-time monitoring of the composite submarine cable. According to the method disclosed by the invention, real-time distributive safety monitoring and alarming can be performed on the composite submarine cable, and the safety sate of the composite submarine cable is judged according to the monitored power grid quality parameter, communication optical fiber excited brillouin reflection frequency offset and calibration data; and the fault analysis is performed on the composite submarine cable having a fault to find out the main reason of the fault.

The invention discloses a predicting method of large-size NEPE propellant loading storage life, which includes following steps: (1) performing constant-stress load single-temperature acceleration test, which includes operations of making an NEPE propellant acceleration aging test sample under constant-stress load and performing a single-temperature-stress level temperature acceleration life test; (2) researching the performance change law during an NEPE propellant loading aging process; (3) determining a failure model of the NEPE propellant loading; and (4) carrying out acceleration life tests at different temperatures and under different pressures to predict the large-size NEPE propellant loading storage life. In the method, by means of loading pressure to simulate the self weight on a large-size NEPE propellant during storage, the performance change law of the NEPE propellant under a temperature-pressure double-stress effect. In addition, with tensile strength as a failure parameter, the method of evaluating the NEPE propellant loading storage life is disclosed.

The invention relates to a test method of an MEMS type sensor-micro-accelerometer, in particular to a test method of micro-accelerometer reliability intensifying test. The method can find out the failure mode of the micro-accelerometer under the integrated stress environment of temperature, vibration and wetness, is convenient for product development, and improves the integrated capability of theproduct, comprising the following steps: 1. the intensifying test of the micro-accelerometer under temperature stress; 2. the intensifying test of the micro-accelerometer under the integrated stress of the temperature and the vibration; and 3. the he intensifying test of the micro-accelerometer under the integrated stress of the temperature, the vibration and the wetness. The method considers theaffect of the temperature, the vibration and the wetness to the inner stricture of the micro-accelerometer. By applying three stress-the temperature, the vibration and the wetness to the micro-accelerometer step by step, the method finds out the condition of the three stress before the micro-accelerometer function is invalid and when the micro-accelerometer function is invalid, so as to be convenient for solve the defect of the micro-accelerometer, improve the integrated capability and the reliability of the micro-accelerometer, and is good for developing new products-the micro-accelerometer with high reliability.

The invention relates to composite pavement temperature measurement of an underground road. The purposes of the invention are to make a research on a method for predicating the temperature of a pavement at any time and in any position and preferably instruct pavement structural and material design of the underground road. In order to achieve the purposes, a technical scheme adopted in the invention is as follows: a method for establishing a composite pavement temperature field model of the underground road is characterized by comprising the following steps: actually measuring a composite pavement temperature field of the underground road; carrying out heat transfer theoretical analysis, air convection heat exchange and air radiation heat exchange on the composite pavement temperature field of the underground road; from basic principles of climatology and heat transfer theory, analyzing the temperature field and temperature stress of the underground road pavement by using a two-dimensional elastic layer theory system according to actual situations of a pavement structure; and making the following basic assumptions. The method is mainly applied to the temperature measurement of the composite pavement of the underground road.

The invention relates to a temperature control pile-soil interface direct shear test device which comprises a portal frame, a lateral constant stiffness loading system, a pile-soil interface simulation system, a water circulation temperature control system, a normal loading system and a data collection system. The portal frame mainly provides a counter-force supporting point for the other systems. The lateral constant stiffness loading system comprises a counter-force frame, a spring fixing plate, a spring, a spring guide rod and a loading plate; the pile-soil interface simulation system comprises a pile lateral soil body box and a pile body box; the water circulation temperature control system comprises a constant temperature water tank, a heater, a refrigerator, a circulating water pump, a water guiding pipe, a valve, a flow meter and a temperature sensor; the normal loading system mainly refers to server hydraulic loading. According to the device, pile-soil interface addition temperature stress monitoring testing, hot and cold cycle after-construction pile-soil interface shear-resistance change rule testing and other testing during temperature field changing can be performed, and then energy pile load-carrying performance impact factors are analyzed.

The invention discloses a designing and prediction method for converting high-temperature stress relaxation data into creep data. The method mainly comprises the following steps: establishing a stress relaxation two-stage superposition model; creating the concepts of equivalent full relaxation time and equivalent relaxation creep rates, carrying out simulation of an equivalent relaxation creep rate in two integrated relaxation stages to obtain a steady-state creep rate under constant stress and establishing a stress relaxation-creep conversion model; acquiring stress relaxation performance data of a high-temperature component material; subjecting the data and the stress relaxation two-stage superposition model to fitting so as to obtain a corresponding material constant; and carrying out calculating according to a numerical analysis program, solving the stress relaxation-creep conversion model and eventually converting stress relaxation data into creep data so as to obtain a steady-state creep rate curve and a steady-state creep curve. According to the invention, accurate association between stress relaxation data and creep data behaviors is established; a prediction method for converting single relaxation data into creep data under any stress is constructed; so a novel approach is provided for designing of creep strength of a high-temperature member and for evaluation of the service life of the high-temperature member.

The invention relates to a method for quickly judging failure mechanism consistency of a temperature stress acceleration experiment, which belongs to the filed of acceleration experiment. The method comprises utilizing an Arrhenius degradation model as a research basis; by means of combination with a Wilbur life distribution model, obtaining relation between the failure mechanism consistency of the acceleration life experiment and shape parameters under different stress levels; specific to early parameter degradation data in the acceleration experiment, calculating distribution shape parameters, and then quickly judging whether the failure mechanism is consistent under different experiment stresses in the initial stage of the experiment. The method for quickly judging failure mechanism inthe initial stage of the experiment avoids the invalid acceleration experiments caused by changes of the failure mechanism and saves experiment time.

The invention provides a mechanical property damage change measurement system and a mechanical property damage change measurement method for fragile materials under high-temperature and low-temperature load and belongs to fragile material measurement system and method. According to the system, a temperature stress coupling and loading device, an acoustic emission signal acquisition device and an image acquisition device are additionally arranged; the temperature stress coupling and loading device is utilized, and an experiment environment is relatively close to an actual environment, such as an environment of deep rocks, so that an experiment research result has a relatively good reference value; the image acquisition device is combined with a digital image correlation technology to obtain a partial displacement field and a strain field of a test piece in a testing process; and the measurement method has the advantages of non-contact and full-field measurement, wide application, high precision, simple acquisition manner on original data, low requirements on measurement environments, and convenience for realizing automation of the whole system. The acoustic emission signal acquisition device is used for detecting the formation and evolution of cracks through measuring cracking energy, so that the damages and attenuation of the fragile materials, such as the rocks, can be described macroscopically and microcosmically under a loading environment.

The invention discloses a system for temperature control and crack prevention intelligent monitoring of a concrete dam. The system for the temperature control and crack prevention intelligent monitoring of the concrete dam is capable of quickening a construction process of a concrete dam and satisfying complex construction and environment conditions. The system for the temperature control and crack prevention intelligent monitoring of the concrete dam comprises a concrete temperature control information collecting unit, a concrete temperature control information control and temperature control implementation evaluating unit, a concrete temperature stress simulated analysis and back analysis unit, a concrete cracking risk real-time early-warning unit and a concrete temperature control and crack prevention feedback and automatic interfering unit, wherein the concrete temperature control information collecting unit, the concrete temperature control information control and temperature control implementation evaluating unit, the concrete temperature stress simulated analysis and back analysis unit, the concrete cracking risk real-time early-warning unit and the concrete temperature control and crack prevention feedback and automatic interfering unit are connected in sequence. Temperature control monitoring data information is collected in real time through the concrete temperature control information collecting unit, the temperature control monitoring data information is stored, controlled, shared and evaluated by the concrete temperature control information control and temperature control implementation evaluating unit, calculation is carried out by the concrete temperature stress simulated analysis and back analysis unit, concrete cracking risk real-time early-warning information is combined, and on-spot temperature control measures are interfered, revised and adjusted through the concrete temperature control and crack prevention feedback and automatic interfering unit. The invention further provides a method using the system.

The invention provides a concrete water cooling overall process testing device and method. A main testing machine comprises a concrete test sample containing device, and a test sample is placed in the concrete test sample containing device; a loading system is connected with a movable clamping chuck arranged on the concrete test sample containing device, a water cooling simulation system is arranged in a concrete test sample containing space and comprises a water pipe, the water pipe is provided with a water inlet and outlet connecting pipe which penetrates through the containing space to be connected with a water supplying device to form a loop, and the loop is provided with two executing mechanisms, that is, the cooling device and the circulating power device; a flowmeter and a water temperature sensor are arranged in the loop. According to the concrete water cooling overall process testing device and method, the self temperature stress developing process including the developing process of parameters such as adiabatic temperature rise, a thermal expansion coefficient, elasticity modulus and creep along with time of concrete in the overall process from pouring to hardening can be tested under the condition of multiple temperature control measures, and a true meteorological environment can be also simulated to simulate the temperature stress and the cracking mechanism which are influenced by natural factors. The device can set different temperature and constraint degree conditions including insulation, constant temperature, temperature rising and lowering process setting and the like as needed. The crack resistance of the concrete is evaluated through a concrete cracking overall process simulation test.

The invention discloses a backscattering enhanced fiber distribution type temperature and strain dual-parameter sensing device and a demodulation method thereof. The sensing device is composed of a narrow-linewidth light source, a coupler, an acousto-optic modulation module, a driver, an erbium-doped fiber amplifier, a circulator, a Raman wavelength division multiplexer, a sensing fiber having a plurality of continuous scattering enhanced point, a filter device, a photoelectric detector, a data acquisition card, and an upper computer. The implementation principle of dual-parameter measurementis as follows: on the basis of the sensitivity to the external environment change by a phase of a backscattering Rayleigh light signal in a sensing fiber and sensitivity to a temperature change by a Raman scattered light intensity, an implementation scheme of absolute temperature stress distributed measurement is provided by using an optical time domain reflection technology, a coherent detectiontechnology, a beat frequency signal cross correlation technology, a phase demodulation technology, a wavelength division multiplexing technique, and a temperature stress decoupling technique. Therefore, simultaneous measurement of a temperature field and a stress field continuously distributed along the optical fiber is realized. Moreover, the measuring distance is long; the spatial resolution ishigh; the sensitivity is high; the response speed is fast; and the error is small.