Grain Size Effect in Sheet Metal Microforming Simulation Adopting Strain Gradient Concept

2007 ◽  
Vol 364-366 ◽  
pp. 1285-1291
Author(s):  
Wing Bun Lee ◽  
Yi Ping Chen ◽  
Suet To
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sheet Metal ◽  
Crystal Plasticity ◽  
Strain Gradient ◽  
Grain Size Effect ◽  
Active System ◽  
Rate Dependent ◽  
Slip Resistance ◽  
Non Local

A strain gradient dependent crystal plasticity approach is adopted to model the size effect in the microforming process of sheet metal. To take into account the grain size effect in the simulation, the total slip resistance in each active system was assumed to be due to a mixed population of forest obstacles arising from both statistically stored and geometrically necessary dislocations. The non-local crystal plasticity has been established by directly incorporating the above slip resistance into the conventional rate-dependent crystal plasticity and implemented into the Abaqus/Standard FE platform by developing the user subroutine UMAT. The formulation has been recapitulated and followed by presentation of the numerical examples employing both the local and non-local formulation. The comparison of the counterpart simulation results reveals the grain size effect in the microforming process and demonstrates the availability of the code developed.

Progressive and Compound Forming for Producing Plunger-Typed Microparts by Using Sheet Metal

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Jun-Yuan Zheng ◽  
Ming-Wang Fu
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sheet Metal ◽  
Mass Production ◽  
Grain Size Effect ◽  
Sheet Metals ◽  
Forming Process ◽  
Deformation Behaviors ◽  
Progressive Forming ◽  
Insight Into

Abstract The plunger part in temporary electronic connectors is traditionally fabricated by micromachining. Progressive forming of microparts by directly using sheet metals is developed and proven to be an efficient microforming process to overcome some intrinsic drawback in realization of mass production of microparts. By employing this unique micromanufacturing process, an efficient approach with progressive microforming is developed to fabricate plunger-shaped microparts. In this endeavor, a progressive forming system for making microplungers using extrusion and blanking operations is developed, and the grain size effect affected deformation behaviors and of surface qualities of the microformed parts are studied. The knowledge for fabrication of plunger-shaped microparts via progressive microforming is developed, and the in-depth understanding and insight into the deformation behaviors and tailoring the product quality and properties will facilitate the design and development of the forming process by using this unique microforming approach.

Grain Size Effect on Saddle Phenomenon in V-Bending Process of Thin Sheet Metal

2018 ◽  
Vol 773 ◽  
pp. 202-207
Author(s):  
Chang Cheng Chen ◽  
Yi Xiang Hong
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sheet Metal ◽  
Design Method ◽  
Tensile Force ◽  
Thin Sheet ◽  
Grain Size Effect ◽  
Sheet Metal Parts ◽  
Grain Sizes ◽  
Thin Sheet Metal

The ability for predicting the springback on sheet metal bending processes is identified as an important feature of the ability for predicting the final geometry of sheet metal parts. The grain size effect makes the difficult on application of traditional design method in processing. As through tool and processing design, to understand the effects of grain size effects is an important and powerful way to effectively compensate for and eliminate the springback. In this paper, 99.5% pure iron specimens were annealed at different temperature to obtain the specified grain sizes. The effects of different grain sizes on the saddle after V-bending of the thin sheet metal were investigated. The results show that at the same thickness of specimens, the grain size has no significant effect on the saddle height. However, with increasing the thickness of the specimens the saddle will also be more prominent protruding height. The concave side of bent specimen is against the compression force and its grains structure tend to a round shape, whereas the convex side is against the tensile force and its grains structure tend to a flaky shape.

Landau-Ginzburg-Devonshire Theory of the Grain Size Effect on the Ferroelectricity in BaTiO 3 Nanoceramics

2020 ◽  
Author(s):  
Kum-Ok Jang ◽  
Il-Hwan Kim ◽  
Il-Hun Kim ◽  
Kye-Ryong Sin ◽  
Chol-Jin Kim
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Grain Size Effect

scholarly journals Finite element analysis of the grain size effect on diffusion in polycrystalline materials

2014 ◽  
Vol 95 ◽  
pp. 187-191 ◽  
Author(s):  
V. Lacaille ◽  
C. Morel ◽  
E. Feulvarch ◽  
G. Kermouche ◽  
J.-M. Bergheau
Keyword(s):  
Finite Element Analysis ◽  
Grain Size ◽  
Finite Element ◽  
Size Effect ◽  
Polycrystalline Materials ◽  
Grain Size Effect ◽  
Element Analysis

scholarly journals Grain size effect on radiation tolerance of nanocrystalline Mo

2016 ◽  
Vol 123 ◽  
pp. 90-94 ◽  
Author(s):  
G.M. Cheng ◽  
W.Z. Xu ◽  
Y.Q. Wang ◽  
A. Misra ◽  
Y.T. Zhu
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Radiation Tolerance ◽  
Grain Size Effect
Sign in / Sign up

Export Citation Format

Share Document