Study on Autofrettage of Cylindrical Pressure Vessels
(Polytechnic College, Hunan Normal University, Changsha 410081)
Abstract: Based on the 3rd strength theory, the theoretical relations
among the equivalent stress of total stresses at elastoplastic juncture,
depth of plastic zone and reverse yielding, and load-bearing capacity
for an autofrettaged cylindrical pressure vessel are analyzed and
demonstrated by using combined image and analytical methods. The method,
formula, nomogram and form determined theoretically to be related to the
depth of plastic zone and load-bearing capacity are provided. Research
shows that it is optimum to control the depth of plastic zone by
以kj=exp(p/ss) is guaranteed; and
the equivalent stress of total stresses at elastoplastic juncture,
can be the minimum if the depth of plastic zone is controlled by kj=exp(p/ss),
where k is vessel diameter ratio, kj is depth of plastic zone, and p/ss
is internal pressure/yield point,
sei' is the equivalent stress of
residual stress at inside surface. The noticeable laws, equations, data
and charts obtained in the course of analysis and demonstration can be
used as the theoretical basis for reference in the engineering design of
pressure vessels, and they make the relations and variation laws among
the parameters of autofrettage theory more clear, penetrating and
Key words: Pressure vessel Autofrettage Depth of plastic layer
CLC No: TH49
Received 20090813, received in revised form 20091220
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