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Abstract: A new method—the stream surface strip element method (SSSEM)
for simulating the three-dimensional deformations of plate and strip
rolling process is put forward. The rolling deformation zone is divided
into a number of stream surface (curved surface) strip elements along
metal flow traces, and the stream surface strip elements are mapped into
the corresponding plane strip elements for analysis and computation. The
longitudinal distributions of the lateral displacement and the
altitudinal displacement of metal are respectively constructed to be a
quartic curve and a quadratic curve, the lateral distributions of them
are expressed as the third-power spline function, and the altitudinal
distributions of them are fitted to be the quadratic curve. From the
flow theory of plastic mechanics, the three-dimensional deformations and
stresses of the deformation zone are analysed and formulated. Compared
with the streamline strip element method (SSEM) that is put forward, the
stream surface strip element method takes into account the uneven
distributions of stresses and deformations along altitudinal direction,
and realizes the precise three-dimensional analysis and computation. The
simulation examples indicate that the method and the model accord with
facts, and provide a new reliable engineering-computation method for the
three-dimensional mechanics simulation of plate and strip rolling
process.
Key words: Plate and strip rolling Three-dimensional analysis
Stream surface strip element method Rolling pressure Friction stress
Tension stress
CLC No: TG335.11
国家自然科学基金(50175095)和教育部骨干教师基金(674)资助项目. Received 20020911, received in
revised form 20030115 |