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3967results about How to "Reduce stress concentration" patented technology

Flexible heart valve

A flexible prosthetic tissue-type heart valve having commissures that are substantially decoupled from a cusp support structure. The valve includes three leaflets having arcuate cusp edges and opposed concave shaped free edges, with outwardly-directed attachment tabs therebetween. A cusp support structure in either one or more pieces attaches to the leaflet cusp edges. Three commissures are each formed partly with an axially-extending insert member to which two adjacent leaflet tabs attach. An inverted V-shaped clip maintains close contact between the adjacent leaflet tabs and provides a stress-relieving clamping action in conjunction with the insert member. The insert member attaches about its lower end to base sections of the cusp support structure, or to an intermediate sewing ring, so that the commissures may pivot about the cusp support structure.
Owner:EDWARDS LIFESCIENCES CORP

Aluminium alloy profile for building template, and preparation method thereof

The invention discloses an aluminium alloy profile for a building template, and a preparation method thereof. The aluminium alloy profile comprises the following components in percentage by weight: 0.85-0.95 percent of magnesium, 0.06-0.65 percent of silicone, 0.15-0.20 percent of copper, 0.05-0.08 percent of manganese, 0.03-0.05 percent of zirconium, 0.04-0.06 percent of chromium, 0.008-0.012 percent of titanium, 0-0.2 percent of iron, 0-0.10 percent of zinc and the balance of aluminium. The aluminium alloy profile provided by the invention has the advantages that the tensile strength is more than 300 MPa, the yield strength is more than 260 MPa, the breakage elongation percentage is more than 12 percent, the tenacity, the weldability and the corrosion resistance are obviously improved compared with that of an original 6061 alloy, the pendulum impact value is more than 20 J / cm<2>, the welding coefficient is not less than 0.6, smaller quench sensitivity is provided, and critical quenching speed is dropped from 10 DEG C / S of the original alloy to 7 DEG C / S; during the processing of the aluminium alloy profile, air cooling is adopted to process an extrusion outlet with the temperature of 450 DEG C in a high-temperature segment as well as an extrusion outlet with the temperature of being smaller than or equal to 25 DEG C in a low-temperature segment, while a moderate-temperature segment, namely a quench sensitive area with the temperature of 450-250 DEG C utilizes water mist to replace direct water-cooling, so that the difficulty for controlling cross section deformation of the profile in the production field is greatly reduced.
Owner:GUANGDONG WEIYE ALUMINUM FACTORY GRP

Superplastic forming/diffusion bonding forming method for heat-resistant titanium alloy envelope

The invention belongs to the technical field of metal plastic processing, and aims at providing a superplastic forming/diffusion bonding forming method for a heat-resistant titanium alloy envelope with high material utilization ratio, high dimension control precision and high product performance. As a mould is adopted to control the appearance and dimension of a workpiece, the forming of a titanium alloy workpiece provided with a complex profile is completed, the production process of the heat-resistant envelope workpiece is shortened, and production cost is lowered; as the process of diffusion bonding followed by superplastic forming is adopted, the diffusion bonding is realized at the contact part of an inner envelope and an outer envelope, and the superplastic forming is realized at a separated part, the once-formed heat-resistant envelope with the complex profile and a hollow structure has the advantages of greatly improved structural integrity of a component, enhanced specific strength and specific stiffness of the component and increased welding rate of the diffusion bonding; the processed workpiece has the advantages of high dimension accuracy, high integral performance, light weight and the like; and the method disclosed by the invention has the advantages of shortened processing period, high material utilization ratio and lowered production cost.
Owner:北京普惠三航科技有限公司
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