Paper Title:
Development of Experimental Method to Improve Sheet Metal Formability by Transverse Normal Stress
  Abstract

To make full use of the promotion potential of hydrostatic stress on the formability of sheet metal, several foundational questions met in practical application of double-sided pressure forming technique are studied in this paper. The theoretical analysis of sheet metal deformation during the double-sided pressure bulging process is carried out, and an analytical approximation for normal pressure loading path that secures out-of-plane stress ratio, γ, continuously increasing (dγ ≥ 0 holds) is presented. Utilization of the relationship between the theoretical approximation for normal pressure load and material hardening properties, a novel double-sided pressure forming method is proposed—the viscous pressure bulging (VPB) of the overlapping sheet metals, in which a highly viscous but flowable semi-solid medium is used as the soft die and the target sheet metal is deformed under the constraints from viscous medium on one side and overlapping sheet on another side. To confirm the efficiency of the proposed method, the VPB test of overlapping sheet metals is simulated by DEFORM-2D, and the experimental tests are also carried out. The results show that σ3 provided by overlapping sheet can overcome the diminishing of γ value caused by evolving strain-hardening and geometric softening effect in the post-diffuse necking stage. The experimental obtained increase of the limit dome height (LDH) of double-sided pressure bulging specimen is 12.6% compared with that of single-sided pressure bulging specimens.

  Info
Periodical
Advanced Materials Research (Volumes 189-193)
Edited by
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
Pages
2949-2956
DOI
10.4028/www.scientific.net/AMR.189-193.2949
Citation
Z. Wang, X. M. Lai, Z. J. Wang, Q. X. Cui, W. T. Li, "Development of Experimental Method to Improve Sheet Metal Formability by Transverse Normal Stress", Advanced Materials Research, Vols. 189-193, pp. 2949-2956, 2011
Online since
February 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Jie Jin, Xin He
Abstract:Air bulge forming is a forming process where an inner pressure deforms the material to the shape of a die cavity. The main concerns about...
2774
Authors: Wei Wei Wang, Jian Li Song, Jing Bo Yu, B.B. Jia
Abstract:Synchronized hydraulic bulging forming technology on three-layer-metal tubes was studied. The possibility of three-layer-metal tubes formed...
1059
Authors: Ho Sung Lee, Jong Hoon Yoon, Joon Tae Yoo
Chapter 1: Advanced Materials Science
Abstract:By using biaxial bulge test, it is possible to predict sheet metal forming behavior during hot forming process. The purpose of this study is...
539
Authors: Tie Jun Gao, Yao Wang, Jian Guang Liu, Zhong Jin Wang
Chapter 16: Material Forming, Machining and Joining, Testing and Evolution
Abstract:Viscous pressure forming(VPF) using a semi-solid, flowable, highly viscous and certain rate sensitive macromolecule polymer as the forming...
2872
Authors: S. Vijayananth, V. Jayaseelan, G. Shivasubbramanian
Chapter 5: Material Characteristics
Abstract:Formability of a material is defined as its ability to deform into desired shape without being fracture. There will always be a need for...
416