215 results about "Ductile materials" patented technology

A body compatible stent is formed of multiple filaments arranged in at least two sets of oppositely directed helical windings interwoven with one another in a braided configuration. Each of the filaments is a composite including a central core and a case surrounding the core. In the more preferred version, the core is formed of a radiopaque and relatively ductile material, e.g. tantalum or platinum. The outer case is formed of a relatively resilient material, e.g. a cobalt/chromium based alloy. Favorable mechanical characteristics of the stent are determined by the case, while the core enables in vivo imaging of the stent. The composite filaments are formed by a drawn filled tubing process in which the core is inserted into a tubular case of a diameter substantially more than the intended final filament diameter. The composite filament is cold-worked in several steps to reduce its diameter, and annealed between successive cold working steps. After the final cold working step, the composite filament is formed into the desired shape and age hardened. Alternative composite filaments employ an intermediate barrier layer between the case and core, a biocompatible cover layer surrounding the case, and a radiopaque case surrounding a structural core.

The invention discloses a dynamic polymer with a dynamic cross-linked structure. Organic boric acid silicon ester bonds are contained on polymer chain skeletons of a cross-linked network and/or on cross-linked link skeletons between polymer chains, wherein the organic boric acid silicon ester bonds are necessary for forming/maintaining a dynamic polymer structure. The dynamic polymer is rich in structure and diverse in properties. By regulating and controlling the structure of a reactant, the dynamic polymers with different properties can be prepared. In addition, due to strong dynamic reversibility of the organic boric acid silicon ester bonds in the polymer, the polymer can exhibit functional characteristics of stimulus responsiveness, self-healing property, recoverability and the like; and besides, due to the presence of the organic boric acid silicon ester bonds, the polymer can also have the energy absorbing effects, and polymer materials can be toughened in a given structure. The dynamic polymer can be used for making shock-absorption cushioning materials, impact-resistance protection materials, self-healing materials, ductile materials and the like.

A cold spray apparatus is provided that includes a nozzle having a converging section and a diverging terminal section. A gas supply meters a majority by atomic percent helium gas to the nozzle at an incident gas temperature of less than 30° Celsius and at an incident velocity of between 2 and 6 MPa. A particulate feeder provides ductile material particulate having a mean x-y-z axially averaged linear dimension of between 0.9 and 95 microns to the nozzle. A composition is also provided that includes a substrate and a coating of ductile metal. The coating has a void density of less than 1% by volume, and an average domain size of between 0.9 and 95 microns. The coating has a compressive residual stress.

A clinching tool for mechanically interconnecting at least two stacked sheets manufactured of a ductile material comprises a punch and a die axially aligned thereto. The die cavity features a radiused surface profile at its closed end thus facilitating material flow therein during clinching action. This design, while minimizing tooling material stresses and reducing the likelihood of premature tooling failure, allows for clinch fastening of thicker sheets by forming a secure and distinguishable clinch.

A method for welding superalloy components at ambient temperature conditions while reducing the propensity of the superalloy material to crack as a result of the weld. A root pass region of the weld is formed using a filler material that exhibits ductility that is higher than that of the base superalloy material. The ductile material mitigates stress in the root region, thereby preventing the formation of cracks. A remaining portion of the weld is formed using a filler material that essentially matches the base superalloy material. The method may utilize a pre-weld heat treatment to grow a gamma prime precipitate phase in the superalloy material, a chill fixture to remove heat during welding, a relief cut to reduce stress in the root region, and a conventional post-weld heat treatment.

The present invention relates to a thread (400) in particular for a thread-rolling or self-tapping screw (100) or nut, respectively, having a non-triangular thread profile (300) with leading thread faces (422) and trailing thread faces (424) wherein at least one of said leading thread faces (422) and trailing thread faces (424) is provided with a convex curvature having a first radius (R). The tip (442) of said non-triangular thread profile (400) has also a convex curvature with a second radius (r1) wherein the value of the first radius (R) is different from the value of the second radius (r1).

A gasket assembly is comprising a substantially flat annular stainless steel gasket core having two partially profiled faces and defining an aperture therethrough, said partially profiled faces comprising a radially spaced alternating peak and groove configuration defined by peak angles of approximately 90°, and four installation tabs secured to an outer periphery of said gasket core formed of a ductile material, wherein said gasket core comprises a gasketing material is disposed upon the profiled faces.

A method serves to adjust a mechanical natural frequency of a hollow body which at least partly comprises a ductile material, in particular a pickup housing of a measurement pickup or a measurement pipe of a measurement pickup. A static external pressure of an atmosphere surrounding the hollow body and/or a static internal pressure prevailing in a lumen of the hollow body, the lumen being sealed off substantially in a pressuretight fashion, is varied in order to generate a pressure difference between the lumen and the atmosphere surrounding the hollow body. The pressure difference is adjusted to a value that causes the material of the hollow body to expand, and at least a proportion of the material of the hollow body is made to flow under the influence of the pressure difference for plastically deforming the material. The method can readily be integrated into already-established pressure tests for measurement pickups of the vibrational type.

A surgical cable comprises a core segment, at least one leader segment, and an outer jacket. The core segment is made from a material having a high tensile strength and which is capable of elongation. Each leader segment is arranged axially in tandem with the core segment and comprises a semi-rigid ductile material capable of being manipulated into a desired shape. A plurality of braided fibers form the outer jacket, which surrounds the core segment and at least a portion of the leader segment. The cable is manipulated by means of the leader segments, which are preferably capable of resisting bending in response to head-on compression, thereby enabling the cable to be more easily manipulated around and through anatomical structures.

The invention provides a method for testing the microzone fracture toughness of a material. The method comprises the following steps: preparing an ultrathin single-edge notched tensile (SENT) specimen; performing repeated loading and unloading operations on an in-situ tensile test machine; recording test load Fi, crack length ai and notch opening displacement Vi by virtue of a scanning electron microscope in-situ test machine; calculating a Ki value for a brittle material and calculating a Ji value for a ductile material; and drawing a K-a curve or J-R curve capable of characterizing crack propagation fracture resistance, thereby obtaining a stress intensity factor K or J integral capable of characterizing the fracture toughness of a miniature specimen. The ultrathin SENT specimen is adopted to measure the microzone fracture toughness of a metallic material, so that the problem that measurement on fracture toughness of ultrathin members and accurate microzones of a large specimen based on traditional standards cannot be realized is solved, and the method has the characteristics of accurate crack tip positioning and high dimension measurement accuracy.

Rotary tools or bits carry cutter element including pointed contact structures and elements for chipping, cutting, and breaking non-ductile materials such as rock. The cutter elements directly contact and cut through rock and other materials and have tapered contact structure ends. Rotary tools or bits for carrying the cutter elements carry fixed cutter elements, or have sockets for removable threaded or rotatable cutter elements, arranged in straight or curved rows on the head opposite a drill-string-engaging base of the tool. The tools also have radially-extending buttresses which help to protect the cutter elements from damage as a drill string and bit are withdrawn from a bore.

A method is provided for producing a wire or tape, especially for use as an electrode or electrode tip in spark plugs. The method includes the following steps: (a) producing an intermetallic compound having a melting point above 1700° C.; (b) grinding the intermetallic compound; (c) mixing the intermetallic compound with metal powder; (d) introducing the mixture obtained in step (c) in a tube produced from ductile material; and (e) shaping the tube filled in step (d) to give a wire or tape. Also provided are a wrapped wire or wrapped tape, especially a semifinished product for producing electrodes or electrode tips of spark plugs.

A method of joining dissimilar materials having different ductility, involves two principal steps: Decoration of the more ductile material's surface with particles of a less ductile material to produce a composite; and, sinter-bonding the composite produced to a joining member of a less ductile material. The joining method is suitable for joining dissimilar materials that are chemically inert towards each other (e.g., metal and ceramic), while resulting in a strong bond with a sharp interface between the two materials. The joining materials may differ greatly in form or particle size. The method is applicable to various types of materials including ceramic, metal, glass, glass-ceramic, polymer, cermet, semiconductor, etc., and the materials can be in various geometrical forms, such as powders, fibers, or bulk bodies (foil, wire, plate, etc.). Composites and devices with a decorated/sintered interface are also provided.

An electrochemical cell having an enclosure comprised of an enclosure body portion composed of a relatively high electrical resistivity material and an enclosure lid portion composed of a ductile material is discussed. The body portion of the enclosure preferably comprises Grade 5 or 23 titanium and the lid portion preferably comprises Grade 1 or 2 titanium. The enclosure lid is joined to the body of the enclosure through a welding process such as laser welding. The combination of these differing materials provides an enclosure that effectively retards the occurrence of eddy current induced heating as well as provides an enclosure that is more mechanically robust.

A method for manufacturing a structural element comprises steps of providing separate first and second half-shells made of at least one layer of composite material including a fibre-reinforced polymeric matrix, providing a core made of ductile material Joking the core to the first half-shell such that at least one cavity is defined inside the structural element, and joining the second half-shell to the first half-shell.

The present invention is a differentially textured material made from a workpiece made of a ductile material with a substantially flat face on which are raised rows of integral and generally pointed barbs. Each barb has a height above the substantially flat face of the ductile material from which the barbs are gouged out. The heights of the barbs vary substantially. The material may be steel and in the form of a sheet. The differentially textured material is particularly well suited for manufacturing disc brake backing plates where the barbs are used to bond the backing plate to friction material. The present invention also includes methods for making such differentially textured material.

A cellular composite laminate structure (101) adapted for efficient energy absorption is provided along with the related use and method of manufacture. The structure uses rigid cellular core layers (102, 103) designed to remain rigid during impact loading to channel an imposed compressive force into plastic deformation of deforming sacrificial layers (116). The rigid cellular core layers (102, 103) are arranged such that they will interpenetrate during impact loading while the deforming sacrificial layers (116) are arranged such that they will impede interpenetration of the rigid cellular core layers (102, 103) and be subjected to tensile deformation only. The rigid cellular core layers (102, 103) and deforming sacrificial layers (116) can be formed to create two-dimensional cellular sheet or three-dimensional cellular topology structures. The deforming sacrificial layers (116) can be connected at various points to the rigid cellular core layers (102, 103) or can be connected only at the periphery of the overall structure. Higher strength, rigid materials are contemplated for the rigid cellular core layers (102, 103) while ductile materials are contemplated for the deforming sacrificial layers (116).

A process for making a valve metal material useful for forming electrolytic devices comprising the steps of: establishing multiple tantalum or niobium components in a billet of a ductile material; working the billet to a series of reduction steps to form said tantalum or niobium components into elongated elements; cutting the resulting elongated elements and leaching the ductile metal from the elements; washing and mixing the cut elements; and forming the cut elements into a sheet. The resulting sheet may be formed into anodes and cathodes and assembled to form a wet electrolytic capacitor.