Finite Element Analysis of IH Module Page: 3 of 17
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Results
Model 1.
The stresses in the outer tube as calculated by Model 1 are given in
Table I for the pressure only, lifting only, and combined loadings. The
preloading stresses are separated from the stresses induced by lifting
because they are secondary stresses; that is, if any yielding occurs under
preload, the result is to reduce the preload force. Therefore, the load
cannot follow the strains, and the stresses cannot cause failure of the
module if a ductile material is used.
Stresses in the outer tube will be evaluated in a manner similiar to
AISC Steel Construction Code procedures, with a maximum allowable
stress in tension of 0.6Sy, and a maximum combined membrane plus
bending stress of 0.67S . The outer tube is assumed to be SS304 stainless
y
steel with Sy = 35000 psi. The primary membrane stresses in the outer
tube will then be allowed to reach 18000 psi, and the primary membrane
plus bending stresses will be allowed to reach 20100 psi.
The secondary stresses due to preload will be evaluated according to
the ASME Boiler and Pressure Vessel Code procedures, since the AISC
Code does not provide extensive guidance for such stresses. The sum of
the primary stresses and the secondary stresses induced by preload will
be allowed to reach 2Sy, or 60000 psi, which is the limit imposed by the
ASME Code for ductile materials. This limit is based on a "shakedown"
criterion which assures that the structure will behave elastically after a
few loading cycles.
Preloading induces a uniform axial stress in the outer tube of 4300
psi. The maximum bending stress in the outer tube resulting from lifting
only is 14200 psi. The combined bending stress for preloading and lifting
is then 18500 psi, which is within the allowable of 20100 psi even if the
preloading stress is classified as primary.
The shear stress in the outer tube is a maximum of 11300 psi for
the lifting load case, and occurs at the junction of the outer shell and
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Wands, R. Finite Element Analysis of IH Module, report, December 4, 1986; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc847159/m1/3/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.