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6804 results about "Stress concentration" patented technology

A stress concentration (often called stress raisers or stress risers) is a location in an object where stress is concentrated. An object is stronger when force is evenly distributed over its area, so a reduction in area, e.g., caused by a crack, results in a localized increase in stress. A material can fail, via a propagating crack, when a concentrated stress exceeds the material's theoretical cohesive strength. The real fracture strength of a material is always lower than the theoretical value because most materials contain small cracks or contaminants (especially foreign particles) that concentrate stress. Fatigue cracks always start at stress raisers, so removing such defects increases the fatigue strength.

Preparation for being fastened on a natural tooth part or tooth and corresponding fastening method

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.

Automatic safe self-destructive disposable blood sampling device

An automatic safe disposable blood sampling device, comprising a case defining an shoot chamber, said shoot chamber being provided with a lancet-exiting hole at a front end thereof; a lancet disposed slidably in said shoot chamber and provided with a puncturing tip at a front portion thereof, said puncturing tip being pointed to said lancet-exiting hole in an alignment manner, a spring disposed at back of said lancet in a shooting direction of said lancet; a locking and shooting structure provided on a side of said lancet and said case along a compression path of said spring, said locking and shooting structure being composed of an elastic arm button on said case and an elastic arm on said lancet, said elastic arm button being an extended structure on a side of said case, a button engaging end of said elastic arm button facing a locking hole provided on a side wall of said case, said elastic arm being another extended structure on a side of said lancet corresponding to said side wall of said case, a free end of said elastic arm being engaged with said locking hole in a locking state, and a root portion of said elastic arm being provided with a notch or a shrink neck oil which stress is easy to concentrate. Since a notch or a shrink neck is provided at the root portion of the elastic arm, the elastic arm disengages from the locking hole after the elastic arm button is pressed, at the same time, the elastic arm is broken to be self-destructed due to the stress concentration on the notch, therefore, the present invention is beyond retrieval after one-off shooting.
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