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Research Papers

Enhanced Ductility in Sheet Metals Produced by Cladding a Ductile Layer

[+] Author and Article Information
X. X. Chen

Department of Mechanical Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada

P. D. Wu1

Department of Mechanical Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canadapeidong@mcmaster.ca

D. J. Lloyd

 Novelis Global Technology Centre, 945 Princess Street, Kingston, ON, K7L 5L9, Canada

J. D. Embury

Department of Materials Science and Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada

Y. Huang

Department of Civil and Environmental Engineering and Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208

1

Corresponding author.

J. Appl. Mech 77(4), 041015 (Apr 16, 2010) (7 pages) doi:10.1115/1.4000926 History: Received July 22, 2009; Revised October 01, 2009; Published April 16, 2010; Online April 16, 2010

The effect of cladding a ductile layer on necking and fracture in sheet metals under plane strain tension is studied numerically using the finite element method based on the Gurson damage model. It is demonstrated that the cladding increases both the necking and fracture strains. The increase in necking strain is due to the fact that cladding a ductile layer enhances the overall work hardening for the layered metal sheets according to the rule of mixtures. Furthermore, the increase in necking strain slows down the development of the triaxial tensile stress inside the neck, which delays the void nucleation and growth, and which, in turn, contributes to enhancement in ductility.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic representation of a tensile sheet with a ductile cladding layer: (a) initial and (b) deformed states

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Figure 2

Uniaxial tension stress and strain curves of the core and clad materials. Stresses are normalized by the yield stress of the core material.

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Figure 3

Mesh A with 90×60 quadrilateral elements (90 in the X-direction and 60 in the Y-direction), each built up with four linear triangular elements (CPE3 in ABAQUS/EXPLICIT )

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Figure 4

Predicted normalized force F∗ and tensile strain ε=ln(1+U/L0) curve for a monolayer sheet of the core material (Γ=0)

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Figure 5

Predicted normalized minimum cross-sectional area A∗ and tensile strain ε=ln(1+U/L0) curve for the monolayer sheet of the core material (Γ=0)

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Figure 6

Predicted distributions of void volume fracture f at various deformation stages for the monolayer of the core material (Γ=0) based on mesh A

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Figure 7

Predicted fracture modes for monolayer sheets of the core material (Γ=0) and clad material (Γ=100%) based on the different meshes

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Figure 8

Predicted normalized force F∗ and tensile strain ε=ln(1+U/L0) curve for a monolayer sheet of the clad material (Γ=100%)

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Figure 9

Predicted normalized minimum cross-sectional area A∗ and tensile strain ε=ln(1+U/L0) curve for the monolayer sheet of the clad material (Γ=100%)

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Figure 10

Predicted normalized force F∗ and tensile strain ε=ln(1+U/L0) curves for tensile sheets with various cladding thickness ratio Γ. Open triangles indicate the initiation of cracking.

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Figure 11

Predicted normalized minimum cross-sectional area A∗ and tensile strain ε=ln(1+U/L0) curves for tensile sheets with various cladding thickness ratio Γ. Open triangles indicate the initiation of cracking.

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Figure 12

Predicted strain to necking εu for tensile sheets with various cladding thickness percentages Γ

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Figure 13

Predicted fracture processes for tensile sheets with various cladding thickness percentages Γ based on mesh A

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Figure 14

Predicted fracture processes for tensile sheets with various cladding thickness percentages Γ based on mesh C

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Figure 15

Predicted normalized fracture strain εf∗ in tensile sheets with various cladding thickness ratios Γ

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