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Tech/Engineering - Mechanics / Mech Engineering / Mechanik | | English term or phrase: higher order transverse shear effects | This invention relates to an adaptive design of fixture for shell/cylindrical components, for the purpose of enabling them to be machined with sufficient supporting rigidity and dynamic stability, so as to maintain the machining precision and surface finish to an acceptable engineering standard. The invention is particularly applicable to thin-walled components where secure fixture and vibration avoidance during machining is difficult to achieve.
BACKGROUND
According to the theory of structural mechanics, well known to those skilled in the art, shell/cylindrical components are defined as a group of hollow objects with openings, shaped with continuity and curvature. A bowl-like structure characterises a shell component, having a single major opening, whereas a hollow tubular structure having a through-opening characterises a cylindrical component. Both have a wall that has a wall-thickness, and each has a profile-dimension, which is either its radius, if its diameter is larger than its height, or its height otherwise. In terms of the profile-dimension-to-wall-thickness ratio, shell/cylindrical components are classified as:
a) Very thick-walled: three-dimensionally stressed, as solid structures;
b) Thick-walled: stretching, bending and ***higher order transverse shear stressed***;
c) Moderately thick-walled: stretching, bending and first order transverse shear stressed;
d) Thin-walled: stretching and bending stressed, but transverse shear neglected;
e) Very thin-walled: dominated by stretching effects, also called as membranes.
...
BRIEF SUMMARY OF THE DISCLOSURE
In accordance with the present invention there is provided a fixture for a shell/cylindrical component comprising: a thick- or very thick-walled base having first location means to locate and clamp one end of the component; a thick- or very thick-walled column fixed in the base; an endless tubular inflatable elastomeric pressure element, disposed on the base between the column and, when in use, the component; and a sacrificial liner adapted to fit between the pressure element and component.
Preferably, the fixture further comprises a thick- or very thick-walled lid to be fixed to the column and having second location means to locate the other end of the component.
Being thick-walled, the column, base and lid provide structures with at least stretching, bending and ***higher order transverse shear effects*** considered, coupled with obvious sparseness of vibration modes at a frequency of 1000 Hz.
http://ip.com/patapp/US20100164187 |
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Roland Hechtenberg
Japan
Local time: 09:45
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