51 results about "Increased fatigue" patented technology

A Ball Grid Array package having an increased fatigue life and improved conductive pad adhesion strength, as well as providing sufficient wiring space within the package, is disclosed. In particular, solder joints having a combination of mask-defined and pad-defined solder joint profiles are formed using a mask having non-circular elongated openings. The non-circular elongated openings of the mask have a major axis and a minor axis, such that the dimension of the openings along the major axis is greater than the diameter of the conductive pads, and the dimension of the openings along the minor axis is less than the diameter of the conductive pads. In addition, the major axis of the openings within the mask are selectively oriented in the direction of highest stress for each solder joint within the package, while providing ample wiring space therein.

A method for improving the performance of sections of rails joined together by welding by reworking welded joints utilizing an ultrasonic impact treatment (UIT) process either before welding, during welding, after welding or during repairs of used rails, including treatment of a joint, around a joint and/or length of a rail, in order to increasing fatigue life and/or other properties of welded rail sections is disclosed. The method provides reduction of stress defects and redistribution of internal stress patterns in the vicinity of weld seams of rails. The UIT provides periodic pulse energy impact treatment with surfaces in welded rails to induce internal compression waves inducing a metal plasticity state in the vicinity of the weld seam of the rail or in the rail itself.

A common rail includes a main pipe rail having a circulating passage extending in its inside in the axial direction thereof, branch holes formed in an axial peripheral wall portion of the main pipe rail, and branch connectors connected to the respective branch holes integrally or via separate connecting members. A Ni-diffused fatigue strength reinforcing layer is formed by heating a Ni layer plated in advance on at least a portion of an inner circumferential surface of the common rail. The increased strength and the action of the fatigue strength reinforcing layer lowers the degree of fatigue concentration to increase fatigue strength against inner pressure.

The high strength alloy steel blank is made through blank making, casting, rectifying, cutting, machining, heat treatment, pill thrusting, and it excels with greatly reduced defects rate, improved in comprehensive feature, doubly increased in part strength and durability. The anti stretch strength reaches 850N/mm2. The impact power Akvj reaches over 27. Through static charge testing, stresses for all the parts are within the allowable scope, increasing fatigue 80%, and durability two times.

A device capable of delivering a continuous or intermittent amount of common paint or paint-like material to a surface to be painted utilizing a standard, off the shelf paint brush, the novel use of which allows the operator the ability to continuously paint with the brush and not having to break the work sequence of painting by continuous interruption of having to reload the brush by dipping it into a paint can, the component parts of which consists of a stationary platform which is centrally mounted on the brush in between the area of the brush handle and bristles, this being securely held in place by a pair of lateral brush clamps, these designed to accommodate a variety of brush sizes and widths, and or as an alternative, a broad band of flexible material having a series of central perforations, longitudinally and also having at its ends, reusable, self-adhesive material, and a rigid tube that is mounted on the top of the stationary platform or, alternately, held in place centrally by the perforations in the flexible banding, the tube acting as a conduit for paint, which is delivered from a remote source to the rigid tube via another flexible connecting tube, the paint being pumped or otherwise delivered to the rigid tube terminus and thus flowing onto the bristle portion of the brush, the paint flow being properly distributed on the bristles by an attached apron, which also aids in reducing paint drippings, all of which allows the painter to continuously apply paint to a surface without interruption or increased fatigue.

Physiologic sensors and methods of application are described. These sensors function by detecting recently discovered variations in the spectral optical density at two or more wavelengths of light diffused through the skin. These variations in spectral optical density have been found to consistently and uniquely relate to changes in the availability of oxygen in the skin tissue, relative to the skin tissue's current need for oxygen, which we have termed Physiology Index (PI). Current use of blood gas analysis and pulse oximetry provides physiologic insight only to blood oxygen content and cannot detect the status of energy conversion metabolism at the tissue level. By contrast, the PI signal uniquely portrays when the skin tissue is receiving ‘less than enough oxygen,’‘just the right amount of oxygen,’ or ‘more than enough oxygen’ to enable aerobic energy conversion metabolism. The PI sensor detects one pattern of photonic response to insufficient skin tissue oxygen, or tissue hypoxia, (producing negative PI values) and a directly opposite photonic response to excess tissue oxygen, or tissue hyperoxia, (producing positive PI values), with a neutral zone in between (centered at PI zero). Additionally, unique patterns of PI signal response have been observed relative to the level of physical exertion, typically with a secondary positive-going response trend in the PI values that appears to correspond with increasing fatigue. The PI sensor illuminates the skin with alternating pulses of selected wavelengths of red and infrared LED light, then detects the respective amount of light that has diffused through the skin to an aperture located a lateral distance from the light source aperture. Additional structural features include means of internally excluding light from directly traveling from the light emitters to the photodetector within the sensor. This physiology sensor and methods of use offer continuous, previously unavailable information relating to tissue-level energy conversion metabolism. Several alternative embodiments are described, including those that would be useful in medical care, athletics, and personal health maintenance applications.

A method of reducing crack propagation in an airfoil includes: providing an airfoil having a root spaced apart from a tip, spaced-apart leading and trailing edges, a suction side extending from the leading edge to the trailing edge, and an opposed pressure side extending from the leading edge and the trailing edge, supporting the airfoil against bending loads; and burnishing the airfoil using a burnishing element, so as to create at least one burnished section of residual compressive stress, the at least one burnished section being located adjacent the leading edge and spaced from the leading edge by an offset distance selected so as to avoid deformation of the leading edge.

There is disclosed a holder for a cutting tool and a method for the production of a cutting tool for metalworking that results in a holder body having increased fatigue strength at loads over 60% of the yield point in tension. The method and the tool are characterized in that the holder body of the tool is subjected to a hardening process resulting in deep hardening, and that the holder body then is subjected to a surface treatment resulting in a strain hardening of the surface in order to introduce compressive stresses in the surface zone of the holder body.

A pneumatic tire may use a combination of high modulus and low modulus plies to provide increased fatigue compression durability without significantly increasing the weight of the tire.

A stent may be inserted into a vessel in order to open and then maintain the patency of the vessel. The stent has a strut design that increases the overall fatigue resistance of the stent. Each strut is tapered to better distribute strain and thus increase fatigue resistance. In addition, some of the struts may comprise protrusions to increase the pushability of the stent during loading into a delivery device.

An auxiliary rubber spring for an automobile suspension, comprising: N layers of metal partitions, N being an integer greater than or equal to 1, and a transverse section of each metal partition being arc-shaped; N+1 rubber layers, the rubber layers being alternately lapped with the metal partitions, and a transversal section of each rubber layer being arc-shaped; a supporting plate provided with a first convex arc surface on one side thereof, the first convex arc surface being bonded to a first concave arc surface of an outermost rubber layer; and a connecting plate provided with a second concave arc surface on one thereof, the second concave arc surface being bonded to a second convex arc surface of another outermost rubber layer. The auxiliary rubber spring for an automobile suspension according to the present invention may increase fatigue resistance of the rubber spring and effectively extend service life thereof.

A common rail for a diesel engine has a main pipe rail with an axial flow passage. Branch holes are made in the main pipe rail and communicate with the axial flow passage. The main pipe rail is worked to decrease stress concentration near the branch holes. The whole inner peripheral surface of the main pipe rail and the branch holes then is subjected to autofrettage processing to generate a compressive residual stress on the entire inner peripheral surface of the main pipe rail and the branch holes for increasing fatigue strength.

Systems, methods, and apparatus for increasing durability of adhesively bonded joints in a sandwich structure. Such systems, methods, and apparatus includes an first face sheet and an second face sheet as well as an insert structure, the insert structure having a first insert face sheet, a second insert face sheet, and an insert core material. In addition, sandwich core material is arranged between the first face sheet and the second face sheet. A primary bondline may be coupled to the face sheet(s) and the splice. Further, systems, methods, and apparatus of the present disclosure advantageously reduce the load, provide a redundant path, reduce structural fatigue, and/or increase fatigue life.