Paradigm Change: Alternate Approaches to Constitutive and Necking Models for Sheet Metal Forming

Journal Article · Mon Aug 22 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3623589· OSTI ID:21611541

Stoughton, Thomas B ^[1]; Yoon, Jeong Whan ^[2]

---

1. General Motors Global Research and Development Center, MC 480-106-244, Warren, MI, 48090-9055 (United States)
2. Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122 (Australia)

This paper reviews recent work proposing paradigm changes for the currently popular approach to constitutive and failure modeling, focusing on the use of non-associated flow rules to enable greater flexibility to capture the anisotropic yield and flow behavior of metals using less complex functions than those needed under associated flow to achieve that same level of fidelity to experiment, and on the use of stress-based metrics to more reliably predict necking limits under complex conditions of non-linear forming. The paper discusses motivating factors and benefits in favor of both associated and non-associated flow models for metal forming, including experimental, theoretical, and practical aspects. This review is followed by a discussion of the topic of the forming limits, the limitations of strain analysis, the evidence in favor of stress analysis, the effects of curvature, bending/unbending cycles, triaxial stress conditions, and the motivation for the development of a new type of forming limit diagram based on the effective plastic strain or equivalent plastic work in combination with a directional parameter that accounts for the current stress condition.

• OSTI ID: 21611541
• Journal Information: AIP Conference Proceedings, Vol. 1383, Issue 1; Conference: NUMISHEET 2011: 8. international conference and workshop on numerical simulation of 3D sheet metal forming processes, Seoul (Korea, Republic of), 21-26 Aug 2011; Other Information: DOI: 10.1063/1.3623589; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
BENDING
FAILURES
FLEXIBILITY
FLOW MODELS
HARDENING
METALS
NONLINEAR PROBLEMS
PLASTICS
REVIEWS
SHEETS
STRAINS
STRESS ANALYSIS
STRESSES
YIELD STRENGTH
DEFORMATION
DOCUMENT TYPES
ELEMENTS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
SYNTHETIC MATERIALS
TENSILE PROPERTIES