Numerical Analysis in the Process of Alternate Pressing and Multiaxial Compression

2012 ◽  
Vol 706-709 ◽  
pp. 1763-1768
Author(s):  
Marcin Kwapisz ◽  
Marcin Knapiński ◽  
Henryk Dyja ◽  
Konrad Błażej Laber
Keyword(s):  
Numerical Analysis ◽  
Equal Channel Angular Pressing ◽  
Mechanical Analysis ◽  
Strain Accumulation ◽  
Angular Pressing ◽  
Grain Crushing ◽  
Compression Strain ◽  
Numeric Simulation ◽  
Multiaxial Compression ◽  
Deformation State

This article presents the results of numeric simulation obtained with commercial software for thermo-mechanical analysis of plastic forging processes, Forge 2009, of the process of alternate forced pressing and multiaxial compression. The new method of alternate forced pressing and multiaxial compression suggested by the authors is characterized by the presence in the plastically forged material of the similar states of deformations to those present in the processes of the equal channel angular pressing and cyclic extrusion compressing. From the performed preliminary tests it can be stated that as a result of combining and repeating two alternate operations: pressing and multiaxial compression, strain accumulation and development of deformation state favorable to grain crushing take place.

Mechanical Properties of Al-5.7wt% Ni Eutectic Alloy Severely Deformed by Equal-Channel Angular Pressing

2007 ◽  
Vol 539-543 ◽  
pp. 2916-2921
Author(s):  
Yoshimi Watanabe ◽  
Zuo Gui Zhang ◽  
Hisashi Sato ◽  
Tomonari Inamura ◽  
Hideki Hosoda
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Internal Friction ◽  
Tensile Properties ◽  
Equal Channel Angular Pressing ◽  
Eutectic Alloy ◽  
Aluminum Matrix ◽  
Mechanical Analysis ◽  
Angular Pressing ◽  
Tensile Process

In this study, an Al-5.7wt% Ni eutectic alloy was subjected to severe plastic deformation (SPD) by an equal-channel angular pressing (ECAP) technique. ECAP technique was carried out by using two strain introduction methods, route BC and route A, at a temperature. It is found that the Al-Ni eutectic alloy specimens after ECAP technique by route BC and route A methods have very different microstructures which affected strongly the tensile properties of the specimens. Namely, after ECAP technique by route BC method, the fine Al3Ni dispersoids of about 300 nm homogeneously dispersed in α-aluminum matrix and the samples appeared no clear anisotropic in tensile properties, while the eutectic textures containing α-Al and Al3Ni fibrous dispersoids have highly anisotropy distribution and are proved to have significant anisotropy tensile properties after ECAP technique by route A method. Results of Young’s modulus and simultaneous internal friction measured by dynamic mechanical analysis (DMA) were also presented. Based on the experimental results, the fracture mechanism during tensile process of the Al-Ni eutectic alloy by different strain induction methods was discussed.

scholarly journals Cоотношение Холла-Петча для размеров скачков деформации металлов

2019 ◽  
Vol 61 (7) ◽  
pp. 1298
Author(s):  
В.В. Шпейзман ◽  
П.Н. Якушев
Keyword(s):  
Yield Strength ◽  
Yield Point ◽  
Equal Channel Angular Pressing ◽  
Interferometric Technique ◽  
Petch Relationship ◽  
Angular Pressing ◽  
Compression Strain ◽  
Deformation Jump ◽  
Jump Sizes

AbstractThe paper presents an attempt to use the Hall–Petch relationship to relate the yield strength of copper and titanium in three different states (initial, annealed, and after equal-channel angular pressing) to the sizes of nano- and micrometer deformation jumps measured using a precision interferometric technique. It is shown that, upon a compression strain near the yield point, one can observe six levels of deformation with three nano- and three micrometer sizes of deformation jumps from 1–2 nm to 20–35 μm. Each of the six structural states of metals is characterized by its own set of deformation jump sizes. Dependences of the yield strengths of copper and titanium on the jump sizes L ^–1/2 are constructed, and the general regularities and features of deformation jumps for each of the metals in different structural states are discussed.

Analytical and Numerical Analysis Comparison of Equal Channel Angular Pressing for Al5083 Alloy

2019 ◽  
Vol 11 (11) ◽  
pp. 1100-1103 ◽  
Author(s):  
Mehmet Şahbaz ◽  
Hasan Kaya ◽  
Aykut Kentli ◽  
Mehmet Uçar ◽  
Serkan Öğüt ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Equal Channel Angular Pressing ◽  
Effective Strain ◽  
Element Analysis ◽  
Angular Pressing ◽  
Ecap Process ◽  
Design Software ◽  
Strain Increase

In this study, the equal channel angular pressing (ECAP) process was modeled by using computeraided design software. Then, it was numerically analyzed by the help of specific finite element analysis (FEA) software. Therefore, effective strain increase in each step of the four passing was obtained. Besides this, the strain increase also was calculated for every step of passing by using the analytical method, and the results of the methods were compared. Moreover, the required load for each passing was determined and the increase of it with the increase of passing was presented.

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