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دانلود مقاله تنش الاستو پلاستیک در جداره ضخیم سیلندر از سایت مکانیک ایران.
نام انگلیسی مقاله: Elasto-Plastic Stresses in Thick Walled Cylinders
تعداد صفحات: ۵ صفحه
رشته: مکانیک – طراحی جامدات
مجله مربوطه: مجله تکنولوژی مخازن تحت فشار (JOURNAL OF PRESSURE VESSEL TECHNOLOGY)
بخشی از مقاله:
Increased strength-weight ratio and extended fatigue life are the
main objectives of optimal design for the modern gun barrel.
These can be carried out by generating a residual stress field in the
barrel wall, a process known as autofrettage.
There are two principal autofrettage processes. One is ‘‘hydrostatic,’’
based on the use of high hydrostatic pressure that is applied
inside the tube and the second is ‘‘swaging,’’ which is based
on the use of an oversized mandrel forced through the tube bore,
thereby causing it to expand.
The residual stresses, which have a compressive effect on the
internal barrel surface, increase the barrel elastic strength pressure
and slow down the development of cracks. Furthermore, it is
sometimes necessary to machine the barrel to its final dimensions,
which reduces the contribution of residual stresses.
Since the basic data for calculating elastic strength pressure and
fatigue life are derived from a precise distribution of the residual
stresses, a theoretical solution for these stresses must be as close
as possible to the practical one. Although there are many solutions
which deal with the problem of determining stress distribution,
none of them are completely satisfactory, since they are all based
on certain assumptions on yield criteria and other effects.
The simplest and most general theoretical treatment of the partially
plastic thick-walled cylinder has been the use of the Tresca
yield criterion, and the assumption of the elastic-perfectly plastic
material, without the Bauschinger effect @1–۳#.
Using the von Mises or Tresca yield criteria together with a
certain Bauschinger effect parameter @4–۸#, a more precise solution
for residual stress was developed, and a good correlation with
the experimental results was achieved.