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ArtikelTwo 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
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Isi artikelA 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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