Generation of Cyclic Stress-Strain Curves for Sheet Metals  

Oleh:

Zhao, K.M. ; Lee, J. K.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Engineering Materials and Technology vol. 123 no. 4 (2001), page 391-397.
Topik: METALS; generation; cyclic; stress - strain curves; sheet metals

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ87.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

The main objective of this paper is to obtain the first few stress - strain loops of sheet metals from reverse loading so that the springback can be simulated accurately. Material parameters are identified by an inverse method within a selected constitutive model that represents the hardening behaviour of materials subjected to a cyclic loading. Three - point bending tests are conducted on sheet steels (mild steel and high strength steel). Punch stroke, punch load, bending strain, and bending angle are measured directly during the tests. Bending moments are then computed from these measured data. Bending moments are also calculated based on a constitutive model. Normal anisotropy and nonlinear isotropic / kinematic hardening are considered. Material parameters are identified by minimizing the normalized error between two bending moments. Micro - genetic algorithm is used in the optimization procedure. Stress - strain curves are generated with the material parameters found in this way, which can be used with other plastic models.

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