Nonlinear Kinematic Hardening Identification for Anisotropic Sheet Metals With Bending-Unbending Tests  

Oleh:

Morestin, F. ; Brunet, M. ; Godereaux, S.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Engineering Materials and Technology vol. 123 no. 4 (2001), page 378-383.
Topik: kinematic; non linear; kinematic; hardening identification; anisotropic; sheet metals

Ketersediaan

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

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Isi artikel

An inverse identification technique is proposed based on bending - unbending experiments on anisotropic sheet - metal strips. The initial anisotropy theory of plasticity is extended to include the concept of combined isotropic and nonlinear kinematic hardening. This theory is adopted to characterize the anisotropic hardening due to loading - unloading which occurs in sheet - metals forming processes. To this end, a specific bending - unbending apparatus has been built to provide experimental moment - curvature curves. The constant bending moment applied over the length of the specimen allows one to determine numerically the strain - stress behaviour but without Finite Element Analysis. Four constitutive parameters have been identified by an inverse approach performed simultaneously on the bending and tensile tests. Our identification results show that bending - unbending tests are suitable to model quite accurately the constitutive behaviour of sheet metals under complex loading paths.

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