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Two Efficient Algorithms of Plastic Integration for Sheet Forming Modeling
Oleh:
Abbes, B.
;
Li, Y. M.
;
Guo, Y. Q.
Jenis:
Article from Journal - ilmiah internasional
Dalam koleksi:
Journal of Manufacturing Science and Engineering vol. 129 no. 4 (Aug. 2007)
,
page 698-704.
Topik:
ALGORITHM
;
algorithm
;
plastic integration
;
sheet forming modeling
Ketersediaan
Perpustakaan Pusat (Semanggi)
Nomor Panggil:
JJ93.10
Non-tandon:
1 (dapat dipinjam: 0)
Tandon:
tidak ada
Lihat Detail Induk
Isi artikel
A fast method called the “inverse approach” for sheet forming modeling is based on the assumptions of the proportional loading and simplified tool actions. To improve the stress estimation, the pseudo - inverse approach was recently developed : some realistic intermediate configurations are geometrically determined to consider the deformation paths ; two new efficient algorithms of plastic integration are proposed to consider the loading history. In the direct scalar algorithm (DSA), an elastic unloading - reloading factor is introduced to deal with the bending - unbending effects ; the equation in unknown stress vectors is transformed into a scalar equation using the notion of the equivalent stress, thus the plastic multiplier can be directly obtained without iterative resolution scheme. In the - return mapping algorithm, the equivalent plastic strain increment estimated by DSA is taken as the initial solution in Simo's return mapping algorithm, leading to a stable, efficient, and accurate plastic integration scheme. The numerical experience has shown that these two algorithms give a considerable reduction of CPU time in the plastic integration.
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