The paper deals with devising the combination of fuzzy inference systems (FIS) and neural networks called the adaptive network fuzzy inference system (ANFIS) to determine the forming limit diagram (FLD). In this paper, FLDs are determined experimentally for two grades of low carbon steel sheets using out-of-plane (dome) formability test. The effect of different parameters such as work hardening...

The failure process ahead of a mode I crack advancing in a ductile thin metal plate or sheet produces plastic dissipation through a sequence of deformation steps that include necking well ahead of the crack tip and shear localization followed by a slant fracture in the necked region somewhat closer to the tip. The objective of this paper is to analyze this sequential process to characterize the...

When a macroscopic metallic wire is subject to tensile stress, it necks down smoothly as it elongates. We show that nanowires with radii comparable to the Fermi wavelength display remarkably different behavior. Using concepts from fluid dynamics, a partial differential equation for nanowire shape evolution is derived from a semiclassical energy functional that includes electron-shell effects. A...

In this study, the effect of a tackifier on viscoelastic and adhesion properties acrylic pressure-sensitive adhesives (PSAs) was investigated. The intermediate products in process PSA synthesis, including an acrylate-based copolymer solution, cross-linked copolymer, final product with tackifier, were prepared characterized using dynamic mechanical analysis (DMA). A significant increase storage ...

Incremental sheet forming (ISF) requires no or partial dies for metal fabrication and is widely used small batch production. In this process, necking either suppressed delayed due to the localized nature of tool–sheet contact; hence, more strains than conventional stamping deep drawing are obtained. present study, two variations ISF, namely cold ISF (CISF) warm (WISF), compared. First, FEA mode...

We investigate the transient viscoelastic behavior of weakly strain-hardening fluids in filament stretching devices during uniaxial elongation and following the cessation of stretching. The numerical results are compared with experimental observations on a concentrated shear-thinning polystyrene solution which is well characterized by a multi-mode Giesekus model. The finite element computations...