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following assumptions have been made in the present research on barrel analysis: A von
Mises yield criterion, isotropic strain hardening in the plastic region in conjunction with
the Prandtl-Reuss theory, pressure release taking into consideration the Bauschinger
effect and plane stress conditions. The stresses are calculated incrementally by using the
finite difference method, whereby the cylinder wall is divided into N-rings at a distance
Dr apart. Machining is simulated by removing rings from both sides of the cylindrical
surfaces bringing the cylinder to its final shape. After a theoretical development of the
procedure and writing a suitable computer program, calculations were performed and a
good correlation with the experimental results was found. The numerical results were also
compared with other analytical and experimental solutions and a very good correlation in
Introduction
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.
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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
مقاله ISI با ترجمه فارسی مدل خزشی برای خاک های غیراشباع در منطقه رانش در رانش زمین ...
linear visco-elastoplastic theorem, is featured with clear physical
meaning, visual concept and good reflection of rheological
properties of geotechnical materials (Sun, 1999). For this purpose,
numerous researches have been conducted using component
et al., 2008; Dey and Basudhar, 2010; Zhang et al., 2012). Most of
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condition into consideration, but the unsaturated condition
دانلود مقاله ISI با ترجمه :بهینه سازی تولید شکلات از طریق قابلیت ردیابی:بررسی تاثیر فعالیت های کشاورزی بر کیفیت دانه کاکائوک
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دانلود مقاله ISI با ترجمه مهندسی مجدد نرم افزاری فرایند کسب و کار در بهداشت ...
reengineering (BPR). BPR can enable us to further understand the adoption of health information systems in
actual clinical settings [14]. Another suggested method in literature is Lean, which for optimizing clinical
workflow [15]. Lean method is used to focus more in details of the process as BPR has a holistic view about
the workflow. When BPR implemented in clinical process, the role of Lean method is to remove waste and
However, if an organization aim to identify defects (perhaps through statistical analysis), then Six
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تعداد صفحه : 9