NDLI: Formability Evaluation of Sheet Metals Based on Global Strain Distribution

Content Provider	Springer Nature Link
Author	Zhang, Ling Lin, Jianping Min, Junying Ye, You Kang, Liugen
Copyright Year	2016
Abstract	According to the conventional methods for formability evaluation, e.g., forming limit curve (FLC), limit dome height, and total elongation, inconsistent results are observed when comparing the formability of four advanced high-strength steels (AHSS) with an ultimate tensile strength grade of 1000 MPa. The strain distribution analysis with the aid of digital image correlation technique shows that different uniform deformation capabilities of sheet metals under the same loading conditions are responsible for this inconsistency. In addition, metallurgical analysis suggests that inhomogeneous microstructure distribution and phase transformation during deformation in some materials play important roles in the uniform deformation capability of sheet metal. Limit strains on the commonly used FLC only relate to the major and minor strains of local deforming elements associated with the onset of necking. However, the formability of a sheet metal component is determined by the strain magnitudes of all deforming elements involved during the forming process. Hence, the formability evaluation of sheet metals from a global aspect is more applicable for practical engineering. A new method based on two indices (i.e., which represent global formability and uniform deformation capability, respectively) is proposed to evaluate the formability of sheet metals based on global strain distribution. The formability and evolution of deformation uniformity of the investigated AHSS at different stress states are studied with this new method. Compared with other formability evaluation methods, the new method is demonstrated to be more appropriate for practical engineering, and it is applicable to both in-plane and out-of-plane deformation. Additionally, the global formability of sheet metals can be more comprehensively understood with this new method.
Starting Page	2296
Ending Page	2306
Page Count	11
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	25
Issue Number	6
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2016-04-20
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	formability evaluation global formability sheet metals uniform deformation Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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