Effect of matrix constitutive behavior and inclusions on forming limits of Fe-42 pct Ni alloy sheet

1998 ◽  
Vol 29 (1) ◽  
pp. 289-298 ◽  
Author(s):  
Norio Yuki ◽  
Robert P. Foley ◽  
George Krauss
Keyword(s):  
Alloy Sheet ◽  
Constitutive Behavior ◽  
Forming Limits ◽  
Ni Alloy

Forming limit analysis of Mg-2Zn-1.2Al-0.2Ca-0.2RE alloy sheet using ductile fracture models

2019 ◽  
Vol 29 (8) ◽  
pp. 1181-1198 ◽  
Author(s):  
Fei-Fan Li ◽  
Gang Fang ◽  
Ling-Yun Qian
Keyword(s):  
Magnesium Alloy ◽  
Ductile Fracture ◽  
Stress Triaxiality ◽  
Forming Limit Diagram ◽  
Alloy Sheet ◽  
Image Correlation ◽  
Forming Limit ◽  
Correlation Technique ◽  
Forming Limits ◽  
Fracture Models

This work was aimed to experimentally and theoretically investigate the formability of a new magnesium alloy sheet at room temperature. The fracture forming limit diagram was predicted by MMC3 and DF2014 models, where the non-linear strain path effect was taken into account by means of damage accumulation law. In order to obtain the instantaneous values of the stress triaxiality and the Lode parameter during the deformation process, strains tracked by digital image correlation technique were transformed into stresses based on the constitutive equations. The fracture forming limit diagram predicted by the fracture models was compared with the forming limits obtained by ball punch deformation tests. The prediction errors were evaluated by the accumulative damage values, which verified the advantages of ductile fracture models in predicting the forming limits of the magnesium alloy sheets.

Texture evolution of an Fe–Ni alloy sheet produced by cross accumulative roll bonding

2014 ◽  
Vol 97 ◽  
pp. 140-149 ◽  
Author(s):  
Hiba Azzeddine ◽  
Kamel Tirsatine ◽  
Thierry Baudin ◽  
Anne-Laure Helbert ◽  
François Brisset ◽  
...  
Keyword(s):  
Accumulative Roll Bonding ◽  
Texture Evolution ◽  
Alloy Sheet ◽  
Roll Bonding ◽  
Ni Alloy

Forming Limits Prediction of FCC Sheet Metal Adopting Crystal Plasticity

2007 ◽  
Vol 340-341 ◽  
pp. 179-186
Author(s):  
Wing Bun Lee ◽  
Yi Ping Chen ◽  
Sandy To
Keyword(s):  
Sheet Metal ◽  
Crystal Plasticity ◽  
Initial Imperfection ◽  
Rate Sensitivity ◽  
Alloy Sheet ◽  
Forming Limits ◽  
Factors Affecting ◽  
Rate Dependent ◽  
Initial Texture ◽  
Process Factors

A rate-dependent crystal plasticity constitutive model together with Marciniak- Kuczynski(M-K) approach is employed to perform numerical simulations of forming limits diagrams(FLDs). An initial imperfection in terms of a narrow band is adopted to initialize the sheet necking. Homogeneous deformations inside and outside the band are assumed and the enforcement of compatibility and equilibrium conditions is required only on the band interface. Constitutive computations are carried out on two aggregates of FCC crystal grains, with each representing one of the two zones, respectively. Taylor homogenization assumption is employed to establish the link of stress between single crystal and polycrystal, and to derive an average response of the aggregates. The same initial texture is imparted to the two aggregates and their evolutions will be traced in the necking process. Factors affecting the FLDs prediction, such as imperfection intensity, initial texture, strain rate sensitivity and crystal elasticity will be taken into account. The above procedure will be applied to an annealed aluminium alloy sheet metal

Martensite Transformation of Ultrafine Grained Austenite in Fe-28.5at%Ni Alloy

2006 ◽  
Vol 503-504 ◽  
pp. 913-918 ◽  
Author(s):  
Hiromoto Kitahara ◽  
Nobuhiro Tsuji ◽  
Yoritoshi Minamino
Keyword(s):  
Martensite Transformation ◽  
Lamellar Spacing ◽  
Alloy Sheet ◽  
Coarse Grained ◽  
Boundary Structure ◽  
Ultrafine Grained ◽  
Ni Alloy ◽  
Mean Grain Size ◽  
The Mean ◽  
Lamellar Boundary

Martensite transformation of the ultrafine grained (UFG) austenite fabricated by the accumulative roll bonding (ARB) process was studied. The Fe-28.5at.%Ni alloy sheet was severely deformed in austenite state by the ARB process up to 5 cycles. The ARB processed sheet had the ultrafine lamellar boundary structure. The mean lamellar spacing was 230 nm in the 5 cycles specimen. The sheets ARB processed by various cycles were cooled down to 77 K to cause the martensite transformation. Martensite transformation starting (Ms) temperature decreased with increasing the number of the ARB process. The Ms temperature of the ultrafine lamellar austenite in the 5 cycles specimen was 225 K, which was lower than that (247 K) of the conventionally recrystallized specimen with mean grain size of 22 μm. The martensite having characteristic morphologies appeared from the UFG austenite, although the martensite transformed from the coarse-grained specimen showed typical plate (or lenticular) morphology. The strength of the nano-martensite transformed from the UFG austenite was about 1.5 times higher than that of the UFG austenite, and it reached to 970 MPa.

A Theoretical Study of the Effect of the Double Strain Path Change on the Forming Limits of Metal Sheet

2013 ◽  
Vol 554-557 ◽  
pp. 127-138 ◽  
Author(s):  
Marilena Butuc ◽  
Frédéric Barlat ◽  
José Grácio ◽  
Gabriela Vincze
Keyword(s):  
Sheet Metal ◽  
Strain Path ◽  
Theoretical Study ◽  
Alloy Sheet ◽  
Initial Shape ◽  
Forming Limits ◽  
Remarkable Effect ◽  
Strain Paths ◽  
Strain Path Change ◽  
Strain Path Changes

The present paper aims at a theoretical study of the forming limits of a sheet metal subjected to double strain path changes by using as reference material the AA6016-T4 aluminum alloy sheet. The simulation of plastic instability is carried out through the Marciniak-Kuczynski analysis. The initial shape of the yield locus is given by the Yld2000-2d plane stress yield function. The strain hardening of the material is described by the Voce type saturation law. Linear and several complex strain paths involving single and double strain path changes are taken into account. The validity of the model is assessed by comparing the predicted and experimental forming limits under linear and selected one strain path change. A good accuracy of the developed software on predicting the forming limits is found. A sensitive analysis of the influence of the type and value of the double prestain in the occurrence of the plastic flow localization is performed. A remarkable effect of the double strain path change on the sheet metal forming limits is observed.

Constitutive Behavior of Commercial Grade ZEK100 Magnesium Alloy Sheet over a Wide Range of Strain Rates

2014 ◽  
Vol 45 (8) ◽  
pp. 3321-3337 ◽  
Author(s):  
Srihari Kurukuri ◽  
Michael J. Worswick ◽  
Alexander Bardelcik ◽  
Raja K. Mishra ◽  
Jon T. Carter
Keyword(s):  
Magnesium Alloy ◽  
Alloy Sheet ◽  
Constitutive Behavior ◽  
Strain Rates ◽  
Magnesium Alloy Sheet ◽  
Commercial Grade ◽  
Wide Range
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