6862 results about "Stress concentration" patented technology

A double shouldered high torque resistance threaded connection for drill stem components having enhanced resistance to torque forces, tensile loads and material stress and fatigue is disclosed. The tool joint is provided with threads having a 75 DEG included angle between the thread flanks thereof and with generally elliptical root surfaces to minimize material stress and fatigue during operation under high torque and high tensile loads. When made up, the double intrerengaging shoulders of the threaded tool joint are in firm face to face engagement permitting torque forces and tensile loads to propagate through the tool joint in a manner that minimizes bending forces and minimizes high stress concentration so that the resulting service life of the tool joint is significantly enhanced.

A preparation (10, 11,12,13) to be fixed to a natural tooth part or tooth, in particular for the replacement of a load-bearing tooth part, is for example a filling for a drilled-out tooth (1), a crown, bridge or prosthesis to be placed on a tooth stub, or a tooth pin to be fixed in a tooth root for fastening an artificial tooth, a bridge or a prosthesis. The preparation has surface regions which consist of a material with thermoplastic properties. The preparation (10, 11, 12,13) is designed in a manner such that it has oscillation properties with such low damping losses that for a liquefaction of the material with thermoplastic properties by way of oscillations there are local stress concentrations required, and in a manner such that such stress concentrations only occur in the region of the preparation surface. The preparation is positioned on a suitably prepared natural tooth part in a manner such that the material with the thermoplastic properties is in contact or may be brought into contact with the dentin surface and/or enamel surface. The preparation is then made to mechanically oscillate and is simultaneously pressed against the natural tooth part, whereby the material with the thermoplastic properties is at least partly liquefied and brought into intimate contact with the dentin or enamel surface in a manner such that after solidification it forms a positive fit and/or material fit connection. Teeth restored with such preparations have a high stability and a long life, which in particular is attributed to the fact that the thermoplastic material, in contrast to cements used for the same purpose, shrinks less and has the ability to relieve internal stress by creeping.

To provide an electro-optical device having a buffer layer which planarizes a gas barrier layer so that stress-concentration in the gas barrier layer is reduced, the buffer layer being prevented from leaking out of a predetermined area, and to provide a method of producing the same and an electronic apparatus. In an electro-optical device 1 having, on a substrate 200, a plurality of first electrodes 23, a bank structure 221 having a plurality of openings 221a positioned correspondingly to the formed first electrodes, electro-optical layers 60 arranged in the respective openings 221a, and a second electrode 50 covering the bank structure 221 and the electro-optical layers 60, the device includes a buffer layer 210 formed so as to cover the second electrode 50 and have a substantially flat upper surface, a frame 215 made of a material having no affinity to the buffer layer 210 and surrounding the periphery of the buffer layer 210, and a gas barrier layer 30 covering the buffer layer 210 and the frame 215.

The invention relates to a coal-gas outburst simulation platform for processing coal-gas outburst simulation researches under different coal bed inclinations, different ground stresses and different gas pressures, and researching the transmission rule and attenuation character of acoustic emission signal in the outburst process. The invention uses a plurality of hydraulic jacks to axially jack coal sample, uses an aeration port to charge gas into the coal sample, and can simulate the protruded stress concentrated zone caused by underground coal face, to simulate the outburst condition of coal and gas. The protruded port of the device via a quick release device can realize mechanical automatic control, to quickly open the protruded port to instantly release pressure at the protruded end and eliminate the effect on the protruding energy by manually opening the protruded port, to simulate on-site protrusion actually.

A valve body and seal assembly comprising a top-stem-guided valve body having at least one cast-in-place elastomeric seal insert in a peripheral seal retention groove and a cast-in-place top guide stem sleeve is made by pouring and curing liquid elastomer in at least one mold comprising the peripheral seal retention groove and the top guide stem. Mold surfaces contacting the poured elastomer are adhesion-inhibiting surfaces which reduce or eliminate background elastomer stress due to shrinkage during curing of the elastomer, and which allow limited relative movement of cast-in-place elastomer with respect to the valve body. Serrations on each of the opposing walls of the seal retention groove are offset to moderate differing stress concentrations in the groove walls.

A valve body and seal assembly comprising a valve body having one or more peripheral integral seal retention grooves and one or more peripheral single-durometer and/or dual-durometer elastomeric seals, each seal being cast-in-place in an integral seal retention groove having adhesion-inhibiting surfaces and offset circular serrations of predetermined height on opposing groove walls. Adhesion-inhibiting surfaces reduce or eliminate internal elastomer stress due to curing of cast-in-place elastomeric seals. Serrations on each of the opposing groove walls are offset to accommodate differing stress concentrations in the walls. Opposing groove walls diverge peripherally. Offset serrations result in decreased metal fatigue from impact and bending stress. Offset serrations also improve valve sealing and increase valve service life by maintaining correct seal position on the valve body while minimizing background stress in the seal elastomer(s). Valve service life is also increased by appropriate choice of differing elastomer compositions for dual-durometer seals.

A cross-connector system for connecting two rods of an implantable vertebral rod system utilizes relatively low-stress concentration contact areas between the connector elements and the rods. The cross-connector system includes a two-piece, elongated member (100) that is adjustable lengthwise and has, at each end, hook-shaped ends (103, 112) which each cooperate with a rotatable, eccentric cam plug (117, 126) having a curved surface (118, 128) that engages and secures a rod to the hook-shaped end in a manner that optimally distributes load to minimize stress concentrations.

A floating foundation for wind turbines is disclosed, where the foundation essentially comprises at least three submerged buoyancy bodies connected to the lower end of the tower of the wind turbine at a common node member situated well above the surface of the sea. The buoyancy bodies are connected to the node member by means of relatively thin leg sections, whereby wave load on the foundation is reduced. By applying the foundation according to the present invention, stress concentrations and torques in the node member are reduced, whereby it becomes possible to apply a relatively lightweight and hence cheap node member. The overall weight of the construction is thereby reduced and hence the volume of the buoyancy bodies necessary to counteract the overall weight of the construction.

The present invention generally relates to a simple and cost effective device and method for mounting and supporting solar panels. A solar panel according to the present invention is supported from the backside via a plurality of elongated support members. The elongated support members may have open V-shaped or W-shaped arrangements and may be adhered to the solar panels through strong, flexible glue or double-sided tape that withstands significant environmental loads, such as wind uploading, yet remain flexible enough to minimize stress concentrations in the solar panels. The support members may be attached to a solar panel by a support member attachment module incorporated into an automated solar panel production line. A plurality of solar panels may be field mounted to a solar panel support structure having one or more piles or the like with at least a lower and upper transverse support rails spanning the plurality of solar panels.

The embodiment of the invention discloses a barrier film, a manufacturing method thereof and a display device. The barrier film comprises a first organic film layer and a second organic film layer, a first groove is formed in the first organic film layer, at least one inorganic film layer is arranged on the first organic film layer, the first groove is filled with the inorganic film layer, and the thickness of the inorganic film layer is smaller than or equal to the depth of the first groove; the second organic film layer is arranged on the inorganic film layer and is a flattened layer. Due to the fact that the thickness of the inorganic film layer is smaller than or equal to the depth of the first groove, an inorganic layer is discontinuous and does not located in the same layer, the phenomenon of stress concentration can be avoided in the bending process, and the risk that the inorganic layer is cracked is lowered.