112 results about "Tangential stress" patented technology

The invention relates to a method of producing a complex microelectronic structure, in which two basic microelectronic structures (1, 3) are assembled at the two respective connecting faces (3) thereof. The invention is characterised in that, before assembly, a difference is created in the tangential stress state between the two faces to be assembled, said difference being selected such as to produce a pre-determined stress state within the assembled structure under given conditions in relation to the assembly conditions.

The invention discloses a true triaxial test method for simulating shearing type rock burst. In the method, a true triaxial loading path and boundary condition characterized in that a single surface is free and five surfaces are stressed is adopted, a test piece with a large size is adopted, a certain three-dimensional load is applied, a loading rate of one direction is controlled, and a cuboid rock sample of which the single side is free under a three-dimensional compression stress state is used for simulating a special mechanical behavior of a field surrounding rock representativeness rock unit in a tangential stress centralization process. When the method is adopted, an inoculation and generation overall process of the shearing type rock burst can reappear in a laboratory, the problem that a traditional indoor test method cannot reasonably simulate the shearing type rock burst under a complex stress condition is solved, and the true triaxial test method has important practical significance and academic value for the mechanism and prediction studies of the type of rock burst.

The invention is a suspension element having an outer edge and an inner edge. The suspension element, such as a spider or surround, varies in shape along at least a portion of the suspension element to help relieve both the radial and tangential stress placed on the suspension element when it is stretched. The shape employed in the suspension element allows the suspension element to stretch more easily, creating a higher performance speaker of the same size by increasing the diaphragm excursion and voice coil movement.

The invention relates to an assembly (M) of a detection unit (100) inside a tyre which is attached to the body (300) of a valve (V) and including the following elements:

a detection unit (100) receiving detection components,

a valve body (300),

sealing means (400) for providing a seal between the valve body (300) and the rim (200),

means (500) for holding the valve body (300) in position on the rim (200) which is preformed with a connection aperture (210) provided for this purpose,

a module for connecting the detection unit (100) to the valve body (300). This assembly is remarkable in that at least one of the elements (500) of said assembly, aside from the sealing means (400), is preformed so that a portion of this element (500) penetrates the connection aperture (210) so as to engage it when the assembly is subjected to tangential stresses.

The invention relates to the field of rock fracture prediction, in particular to a shale hydraulic fracture propagation prediction method. The method comprises the steps that 1, the normal direction,tangential stress and effect stress of an inclined fracture under the action of the external stress and water pressure are calculated; 2, a strain energy density function is obtained according to thetype of the fracture; 3, a strain energy density factor is obtained according to the strain energy density function; 4, the propagation direction and propagation angle of the fracture are judged according to a strain energy density criterion; 5, influences of stratification, natural fractures and the like on the propagation direction of hydraulic fractures are obtained through numerical simulation, so that fracture propagation under the effect of shale hydraulic pressure is predicted. The prediction method is based on fracture mechanics, a hydraulic condition factor is introduced, and the influences of different stratification directions on the propagation direction of the shale hydraulic fractures are obtained by researching the relation between the fracture propagation direction and themagnitude of the hydraulic pressure and utilizing an extended finite element method, so that accurate prediction of hydraulic fracture propagation is achieved, and higher prediction accuracy is obtained.

The invention discloses an experiment method for simulating different types of rock explosion. The experiment method is characterized by comprising the following steps: step 1, preparing a rock explosion test sample; step 2, performing a three-direction six-side loading, single-side unloading and top gradient loading experiment method on the rock explosion test sample; step 3, choosing appropriateinitial confining pressure, loading to initial confining pressure level and then simulating a chamber excavation process through horizontal single-side unloading under the situation that load of other sides are unchanged; step 4, achieving different gradient loading purposes by controlling four groups of independent loaders at the top of the rock explosion test sample, simulating chamber tangential stress concentration and gradient loading until the rock explosion test sample is damaged; step 5, in a rock explosion test sample loading damage process, monitoring and recording an experiment process; step 6, cleansing and analyzing experiment data. The method can recognize brittle failure modes partially happened in engineering and has important theoretical and engineering significance in choosing a reasonable surrounding rock construction method and a reasonable supporting system.

The invention relates to a design method for row space between pressure relief boreholes. The method comprises the following three steps of: before the row space between the pressure relief boreholes is designed, firstly, requiring to evaluate the stress environment of a pressure relief site, and calculating a working face (roadway) surrounding rock supporting pressure peak value [Sigma]p and a peak value position Lp; selecting a surrounding rock on the Lp as an analysis object, adopting a corrected surrounding rock elastoplasticity analytical solution to calculate a borehole plastic zone radius rp, taking the rp as an index for evaluating the single-hole action range of the borehole, and determining the maximum row space between the boreholes as R which is less than or equal to 2rp; and meanwhile, adopting the elastoplasticity analytical solution to calculate the evolution curve of the circumferential stress [Sigma][Theta] of the borehole, taking the stress of a crosspoint of the circumferential stress curves of the adjacent boreholes as [Sigma]m, taking the stress [Sigma]0 of primary rock of an experiment site as an evaluation index, and determining the condition of the minimum row space R between the boreholes as [Sigma]m which is greater than or equal to [Sigma]0. The method is simple in operation and high in practicality and can be applied to fields including high-stress roadway pressure relief, rock burst prevention and treatment, high gassy seam permeability increasing and the like, the design accuracy of the row space between the boreholes can be effectively improved, and a borehole engineering quantity is lowered.

The invention provides a rock-soil body shearing rheometer considering seepage-stress-chemical coupling. The rock-soil body shearing rheometer considering seepage-stress-chemical coupling comprises a test bench, a shearing box assembly, a loading assembly and a displacement-stress monitoring assembly; a large-size test sample can be placed in a shearing box unit, chemical liquid with a certain osmotic pressure is provided through a water pump, the test sample is dried through a hot air circulating unit, and seepage of the chemical liquid with different osmotic pressure and dry-wet circulation of the test sample are realized; normal pressure is loaded by weights, tangential pressure is loaded by a rigid spring, a vibration exciter acts on a spring so as to generate disturbance on tangential stress, and the deformation amount of the rigid spring is maintained by controlling a linear displacement mechanism to guarantee stability of the tangential stress; the displacement-stress monitoring assembly cooperates with a corresponding data acquisition system to monitor the displacement of a lower shearing box and the tensile force of the test sample. The rock-soil body shearing rheometer considering seepage-stress-chemical coupling can research the problems about rock-soil body disturbed by power, underwater, chemical corrosion, dry-wet circulation and long-term stability of single or combined action of stress.

The invention discloses a pile-soil interface three-axis model testing device under a condition of seepage. The pile-soil interface three-axis model testing device comprises a three-axis confining pressure chamber, a vertical loading and unloading platform, a confining pressure control system, a seepage control system and a data acquisition system, wherein a pile-soil sample is arranged in the three-axis confining pressure chamber and has an interface between a pile body and a soil body; the vertical loading and unloading platform is used for loading tangential stress to the interface; the confining pressure control system is used for loading normal stress to the interface; the seepage control system is used for controlling seepage parameters in the pile-soil sample; and the data acquisition system is used for acquiring deformation data of the pile-soil sample in the three-axis apparatus confining pressure chamber. The pile-soil interface three-axis model testing device under the condition of seepage is capable of more conveniently studying stress characteristics of the pile-soil interface of the soil body under the action of coupling the seepage and the complex stresses.

The invention relates to an intelligent wind wheel, in particular to an intelligent wind wheel used for a vertical axis wind generating device. The intelligent wind wheel used for the vertical axis wind generating device comprises an upper wheel rim and a lower wheel rim; a support bar and a vane shaft are arranged between the wheel rims; the vane shaft is provided with a wind sail; the wheel rims, the support bar and the vane shaft form a regular prism; the middle part of the regular prism is provided with a wheel shaft; and a wheel hub is arranged between the wheel shaft and the wheel rim. The intelligent wind wheel used for the vertical axis wind generating device has the advantages and effects that the wind wheel does not need a windward adjusting system and can receive wind from any direction in an orientation of 360 degrees, and a main shaft permanently rotates towards the design direction. The wind sail rotates along a self shaft, and continually changes direction so that the tangential stress of the wind sail is maximized down the wind and the wind sail against the wind is parallel to the wind direction. The rotating angle of the wind sail is judged by a main controller according to the indication of a wind indicator and the current rotating relative position of the wind sail, and information is transmitted to a wind sail controller. The intelligent wind wheel used for the vertical axis wind generating device can reduce the cost, is convenient to maintain, and has low pneumatic noise.

The invention discloses a piezoelectric stack-based vibration reduction ring device, and belongs to the field of design for vibration reduction devices. The vibration reduction ring device comprises an inner ring, an outer ring, an inner ring end cover, an outer ring end cover, piezoelectric stacks and butterfly-shaped connection elements, wherein one piezoelectric stack is connected to the longitudinal symmetry axis of each butterfly-shaped connection element; the butterfly-shaped connection elements are uniformly distributed in aligned grooves between the inner ring and the outer ring; and the inner ring end cover and the outer ring end cover are further arranged at the upper ends of the inner ring and the outer ring separately. According to the novel vibration reduction ring design disclosed by the invention, the vibration reduction ring is capable of effectively reducing vibration transferred to supporting by a transmission system through a shaft and a bearing by virtue of a piezoelectric shunt damping technology, and capable of effectively preventing the piezoelectric stacks from bearing tangential stress and torque, thereby prolonging the service lives of the piezoelectric stacks.

The invention discloses a true triaxial test method of simulating an extensional rock burst. The method employs a true triaxial loading route and a boundary condition of single side freeness and five side stressing, and utilize a cuboid rock sample in a single side freeness and three directional compressive stress state to simulate a special mechanical behavior of a representative rock unit of field wall rock in a tangential stress concentration process by applying a certain three directional load and controlling a loading speed of one direction. The method can be used for representing a whole inoculation and occurrence process of the extensional rock burst in a laboratory. The method solves the problem that the traditional indoor test method cannot simulate the extensional rock burst under a complex stress condition reasonably and has important practical significance and academic value in promoting mechanism and prediction studies of the rock burst.

A foldable electronic device module includes a glass cover element having a thickness from about 25 [mu]m to about 200 [mu]m, an elastic modulus from about 20 GPa to about 140 GPa and a puncture resistance of at least 1.5 kgf. The module further includes a stack with a thickness between about 100 [mu]m and about 600 [mu]m; and a first adhesive joining the stack to the cover element with a shear modulus between about 1 MPa and about 1 GPa. The stack further includes a panel, an electronic device, and a stack element affixed to the panel with a stack adhesive. Further, the device module is characterized by a tangential stress at a primary surface of the cover element of no greater than about 1000 MPa in tension upon bending the module to a radius from about 20 mm to about 2 mm.

A method for predicting fretting fatigue life of a nickel-base single crystal alloy turbine blade tenon includes establishing a fretting fatigue contact analysis model of that nickel-base single crystal alloy turbine blade tenon; calculating the model under the given working condition and obtain the analysis parameters, which include shear stress, tangential stress and relative slip distance at different positions of the contact surface; determining the shear stress damage factor at different positions of the contact surface of the model under a given working condition; the cumulative dissipative energy damage factors at different positions of the contact surface of the model are determined according to the given operating conditions and analysis parameters. According to the shear stress damage factor and cumulative energy dissipation damage factor, the fretting fatigue comprehensive damage factor is determined, and the fretting fatigue life of nickel-based single crystal alloy turbineblade tenon is obtained. The fretting fatigue life prediction method of the nickel-based single crystal alloy turbine blade tenon can accurately predict the fretting fatigue life of the nickel-basedsingle crystal alloy turbine blade tenon.

The invention discloses a quasi-static measurement method for a tangential piezoelectric strain constant of a piezoelectric material d15, and a system thereof. In the method, a special tangential stressing component converts 'longitudinal force' of a piezoelectric test sample into a 'tangential force' on an existing quasi-static d33 measuring apparatus, and directly provides a measurement result of the d15 tangential piezoelectric strain constant of the piezoelectric test sample. The measurement system consists of the tangential stressing component, a force application device and a circuit component, wherein, the tangential stressing component consists of a strained compression fixing component which is composed of a strained compression fixing bracket, a fixing frame, a fixing shaft, an adjusting bolt, an insulating bush and a positioning shaft sleeve, and a strained compression component. The force application device and the circuit component are applicable to various types of quasi-static d33 measuring apparatuses, and the force application device and the circuit component of the quasi-static d33 measuring apparatus are connected by two multi-core cables according to requirements of the existing quasi-static d33 measuring apparatus. Compared with the existing dynamic method, the method and the system have the advantage of simple operation, strong practicability and easy popularization and implementation.

The invention discloses a testing device for rock three-axis external pressure and hole internal hydraulic pressure coupling loading and unloading. The testing device is composed of a base, a confining pressure loading and unloading system, a hole internal hydraulic pressure loading and unloading system and an axial pressure loading and unloading system. The confining pressure loading and unloading system comprises a pressure chamber, a confining pressure bag, a protection tire, an oil inlet and outlet channel and a confining pressure electro-hydraulic servo system. The hole internal pressure loading and unloading system comprises an inner pressure bag, an upper sealing member, a lower sealing member, an upper L-shaped elbow, a lower L-shaped elbow, an upper cover plate, a lower cover plate and an internal pressure electro-hydraulic servo system. The axial pressure loading and unloading system comprises a loading block, a piston rod, an oil cylinder, an upper oil cavity channel, a lower oil cavity channel and an axial pressure electro-hydraulic servo system. The testing device is compact in structure, and all functions are independent and collaborative; different non-uniform radial stress fields and different non-uniform tangential stress fields, all of which are distributed in the circumferential direction can be constructed by adjusting the different confining pressure and internal pressure combinations, and linear and nonlinear radial unloading and tangential loading stress paths at points on the non-uniform stress fields in a rock sample can be achieved by adjusting the unloading rate of the internal pressure in a servo mode.

The invention discloses a cerebrovascular system function and brain recirculation dynamic analysis method, wherein iconographical index and tangential stress index for reflecting cerebrovascular atherosclerosis degree and arteria carotis blood vessel are added into the analytical method, these two indexes can perform early diagnosis and analysis to atherosclerosis and comprehensive analysis for the prevention and early stage diagnosis for cerebrovascular diseases. The invention also discloses the related analytic instrument based on the method for detecting blood vessel diameter by employing type B supersonic detection, which can improve detecting accuracy substantially.

The invention discloses a mirror topology tangential loaded circular ring stress superposition method. The method comprises the following steps that a static model of a circular ring under the actionof single tangential concentrated force is established on a micro section of the circular ring; calculating a distribution function of the tangential stress and the radial stress of the circular ringunder the action of a single tangential concentrated force through a static model; and obtaining a distribution function of the tangential stress and the radial stress of the mirror topology tangential loaded circular ring by utilizing a superposition method. Compared with the prior art, the method has the characteristics of innovation, high efficiency, accuracy, universality and the like. According to the method, the relationship between the tangential concentrated force distribution and the stress distribution can be studied.