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ZHAO Yinghong
LEI Liping
ZENG Pan
Key Laboratory for
Advanced Materials Processing Technology of
Ministry of Education,
Beijing 100084, China
Department of Mechanical Engineering,
Tsinghua University,
Beijing 100084, China
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NUMERICAL SIMULATION OF MECHANICAL
BEHAVIORS OF SUPERCONDUCTING POWDER
BSCCO (BiSrCaCuO)*
Abstract: An equivalent continuum
method and a deformable discrete method to describe the
mechanical behaviors of superconducting powder BSCCO (BiSrCaCuO)
aggregate are studied syste- matically. The equivalent continuum
model idealizes the aggregation of the powder as an equivalent
continuum material. The powder aggregate yielding is caused by
not only the deviatoric stress but also the hydrostatic stress
and the modified Drucker-Prager/Cap model is adopted to describe
the mechanical behaviors of BSCCO powder aggregate in continuum
method. The deformable discrete model is known as a direct
model, which considers the discrete nature of the powder
particles. Its framework encompasses the local behaviors between
the particles, such as particles contact, sliding and rolling.
Based on commercial finite element software ABAQUS, the
equivalent continuum model and the deformable discrete model are
used to simulate the confined compression of superconducting
powder BSCCO, and the numerical results show agreement with
experimental results, which verify the correctness of these
built models. Compared with the equivalent continuum model based
on macroscopic statistics method, the deformable discrete model
can present the microscopic information during processing and
can describe the nature of mechanical behaviors of
superconducting powder BSCCO. But from an industrial viewpoint,
the equivalent continuum model has a definitive edge over the
microscopic models in that the gross behavior of the powder mass
can be modeled and simulated on an industrial scale.
Key words:
BSCCO (BiSrCaCuO) Mechanical behaviour Discrete method Continuum
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