30 results about "Stress axis" patented technology

A method for making a semi-conductor nanocrystals, including at least the steps of:making a stack of at least one uniaxially stressed semi-conductor thin layer and a dielectric layer,annealing the semi-conductor thin layer such that a dewetting of the semi-conductor forms, on the dielectric layer, elongated shaped semi-conductor nanocrystals oriented perpendicularly to the stress axis.

The invention belongs to the technical field of asphalt mixture shear behavior testing, and relates to a testing device of the pressure-torsion shear failure performance of an asphalt mixture. The device provides a constant-temperature environment through an outer circulating heat preservation system and exerts axial pressure and torsion loads on asphalt mixture test pieces in an independent or combination mode. A dual-layer plane ball bearing is arranged, transmits axial pressure to a left fixed plate and releases torsion loads; a square-section section is arranged at the right end of an axial pressure loading shaft, and torsion loads are borne by a square hole of a right fixed plate; a spring is arranged to buffer axial pressure loads. A torque sensor and a pressure sensor which are completely separated spatially are adopted, the measuring ranges of the two sensors do not need to be matched, and the two sensors do not influence each other. By means of the device, the failure process of the asphalt mixture in the moderate and high temperature environment and the complicated torsion stress state can be simulated; when the torsion loads continuously change, the direction of the main stress axis of a test piece continuously changes, and the change characteristic of the real stress state of a road surface is met.

The invention discloses a multi-iron-heterogeneous magnetic field sensor adjustable in measuring range and a measuring range adjusting method. The magnetic field sensor comprises a bottom metal electrode layer, a free layer, an isolation layer, a pinning layer and a top metal electrode layer which are arranged from bottom to top in sequence. The free layer is of a multi-iron-heterogeneous multi-layer structure and comprises a ferroelectric layer and a first ferromagnetic layer from bottom to top in sequence. The pinning layer is of a multi-layer structure and comprises a second ferromagnetic layer and a reverse ferromagnetic layer from bottom to top in sequence. A ferroelectric stress axis direction of the free layer is perpendicular to a magnetic moment direction of the pinning layer in horizontal projection. The measuring range adjusting method comprise the steps that: a measuring range switching voltage V is applied to the ferroelectric layer of the magnetic field sensor, the ferroelectric layer is enabled to generated an electric field stress, the first ferromagnetic layer is under the effect of the electric field stress, and a saturated magnetic field is changed, so that the measuring range of the magnetic field sensor is changed. The invention provides the multi-iron-heterogeneous magnetic field sensor simple in structure, small in size and convenient and flexible, and the measurement precision of the sensor in a low magnetic field is ensured.

A device for managing an accumulator, including: a plurality of strain gauges including at least three strain gauges, the strain gauges being arranged to measure stresses along at least three distinct stress axes; a measuring device measuring strains undergone by each gauge along its stress axis; a reversible electrical switch; a calculating device controlling opening and closing of the electrical switch, depending on measurements carried out by the measuring device.

A safety and anti-theft lock control device, comprising: a lock body box, a half-type side shaft, a passive stress gear, a force-bearing toggle pin, and a locking stress shaft piece, which is characterized in that the bottom of the lock body box is fixed by a half-type side shaft, and On the half-type side shaft, there is a shaft center hole of the passive stress gear to be dynamically assembled with it, and the passive stress gear is fixed with a load-bearing toggle pin; the locking stress shaft piece is set and operated in the groove of the lock body box, and There is a transverse stress slot on the part suitable for the bearing toggle pin to move. Since the transverse stress slot passes through the extension hole left on the side of the axis line of the passive stress gear, it can be used for the bearing toggle pin to move along with it. The passive stress gear rotates at least 180 degrees, and the margin of the transverse slot on the other side passes through the axis line of the passive stress gear to a dead angle within 15 degrees. When the locking stress shaft is moved in the groove by bearing force When the pin is moved here, it is just blocked by the dead angle, which means that a kind of lock control stress check and balance relationship is satisfied.

The invention relates to the technical field of optical waveguide and polarization-maintaining fiber coupling in integrated optical devices, in particular to a stress axis fixation method of a polarization-maintaining fiber before the polarization-maintaining fiber is bonded with a fiber support. The method comprises the following steps of: (a) connecting an extinction ratio meter to one end of the polarization-maintaining fiber and inputting linearly polarized light with a high extinction ratio to the other end of the polarization-maintaining fiber; (b) applying normal force to the polarization-maintaining fiber in any directions and changing the size of the normal force; and (c) observing a numerical value displayed by the extinction ratio meter to determine the slow axis direction of the polarization-maintaining fiber. The method has the advantages that by applying the working principle to carrying out axis fixation of the polarization-maintaining fiber, the method greatly improvesthe accuracy of axis fixation, thereby further improving the extinction ratio of the devices.

The invention discloses a build-up force standard machine with a wide range, belongs to the technical field of force standard machinery, and is characterized in that the build-up force standard machine comprises a first detecting unit and a second detecting unit, wherein the upper limit of the range of the first detecting unit is in accordance with that of the build-up force standard machine; the lower limit of the range of the first detecting unit is in accordance with the upper limit of the range of the second detecting unit; the lower limit of the second detecting unit is in accordance with that of the build-up force standard machine; the force output directions of the first and the second detecting units are in accordance with each other; and the stress axis of a to-be-detected sensor is overlapped with those of the first and the second detection units. The build-up force standard machine has the advantages of large range, low manufacturing cost and the like.

The invention relates to a machining method of a profiling lower die blank of a 22224 spherical roller. The method is characterized by comprising the following processing steps that: the profiling lower die blank of the 22224 spherical roller takes Gr15 high-carbon chromium high-quality steel as a material; the material is prepared and blanked (a material diameter phi is 120 and a blanking length is 175); start forging temperature is 1100-1130 DEG C. The specific machining method comprises the steps of: upsetting, forging a square, drawing the square, upsetting, forging the square, drawing the square again, upsetting, forging the square, drawing the square again, loading a casing and forming at forging-stop temperature of 800-900 DEG C, forming potholes in the end faces of a die with a forming punch, allowing a metal fiber direction of the material to be perpendicular to a stress axis direction of the lower die, and allowing fiber directions of the material around the potholes to be perpendicular to a stress direction during profiling, wherein an allowance between the dimensions of each pothole and a cavity is 1.5-2mm. The service life of the profiling lower die machined by the method can be prolonged by 2-3 times.

The invention discloses a fatigue testing method for a rail transportation vehicle body welding structure, and belongs to the technical field of fatigue testing. The method comprises the following steps: 1, making preparations before testing: performing numerical simulation analysis to determine a load value; 2, assembling a test sample and a fixture: rigidly clamping and fixing a straight vehicle body section of the vehicle body welding structure test sample by adopting a rigid clamping end and elastically clamping and fixing an irregularly-shaped vehicle body section by adopting an elastic clamping end, to form a combined test body; 3, fixing the combined test body on a fatigue tester; 4, performing loading test according to the load value; 5, performing detection. According to the method, any shape can be effectively fixed and clamped by rigid and flexible combination, and the actual stress centerline of the welding structure is overlapped with the loading stress axis of the fatigue tester, so that the fatigue level of the rail transportation vehicle body welding structure can be accurately measured.