Numerical Investigation on the Effects of Circuit Parameters on the Plastic Deformation of Fastener Holes in Thin Aluminum Alloy via Electromagnetic Expansion Process

Abstract The size of plastic deformation zone during fastener hole strengthening is a critical indicator of the strengthening effect. In this study, a considerable plastic deformation zone in 1.5 mm aluminum alloy plate with a hole was produced via electromagnetic strengthening. The finite element analysis results showed that the electromagnetic strengthening process could achieve high compressive hoop residual stress around the fastener hole in thin plate without serious axial deformation compared with conventional cold hole expansion process. The simulation results were experimentally validated by the grid method. Furthermore, for the same discharge energy, the size of plastic deformation zone varies with the discharge capacitance, and there was an optimal combination of the discharge capacitance and discharge voltage. What’s more, even the plastic deformation zone was the same at the maxed load, different unloading process during the electromagnetic hole expansion process also had a great influence on the strengthening effect.

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Research of stamping of unequal channel bars. Part 4. Deformed state of the workpiece when extruding channels. 2. Deformations under the punch end

10.36652/0042-4633-2021-6-53-57 ◽

2021 ◽

pp. 53-57

Author(s):

A.L. Vorontsov

Keyword(s):

Plastic Deformation ◽

Plane Strain ◽

Deformation Zone ◽

Plastic Deformation Zone ◽

Die Forging ◽

Deformed State

Determination of the deformed state of the workpiece at free extrusion of channels is considered. Formulas are obtained for determining the accumulated deformations at a given point of the plastic deformation zone and extruded walls of the product for any punch working stroke. Keywords: die forging, extrusion, misalignment, punch, matrix, plane strain, accumulated deformations, hardening. [email protected]

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Nanoindentation Characterization of Single-Crystal Silicon With Oxide Film

10.21203/rs.3.rs-512020/v1 ◽

2021 ◽

Author(s):

Lianmin Yin ◽

Yifan Dai ◽

Hao Hu

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

Oxide Film ◽

Single Crystal ◽

Deformation Zone ◽

Single Crystal Silicon ◽

Plastic Deformation Zone ◽

Crystal Silicon ◽

Ultra Precision

Abstract In order to obtain ultra-smooth surfaces of single-crystal silicon in ultra-precision machining, an accurate study of the deformation mechanism, mechanical properties, and the effect of oxide film under load is required. The mechanical properties of single-crystal silicon and the phase transition after nanoindentation experiments are investigated by nanoindentation and Raman spectroscopy, respectively. It is found that pop-in events appear in the theoretical elastic domain of single-crystal silicon due to the presence of oxide films, which directly leads the single crystal silicon from the elastic deformation zone into the plastic deformation zone. In addition, the mechanical properties of single-crystal silicon are more accurately measured after it has entered the full plastic deformation.

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An etching characterization method for revealing the plastic deformation zone in a SUS303 stainless steel

Journal of Materials Science ◽

10.1007/s10853-009-4068-5 ◽

2009 ◽

Vol 45 (5) ◽

pp. 1220-1226 ◽

Cited By ~ 3

Author(s):

Mitsuhiro Okayasu ◽

Kazuto Sato ◽

Satoshi Takasu

Keyword(s):

Plastic Deformation ◽

Stainless Steel ◽

Deformation Zone ◽

Plastic Deformation Zone

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Form and dimensions of the plastic deformation zone at the tip of a blind crack under tension

Strength of Materials ◽

10.1007/bf00772385 ◽

1981 ◽

Vol 13 (11) ◽

pp. 1355-1359

Author(s):

A. G. Kozlov ◽

M. S. Sinyagovskaya

Keyword(s):

Plastic Deformation ◽

Deformation Zone ◽

Plastic Deformation Zone ◽

Blind Crack

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Construction and solution of strain model along thickness of aluminum alloy plate under plastic deformation

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(15)63973-5 ◽

2015 ◽

Vol 25 (10) ◽

pp. 3381-3388

Author(s):

Shu-yuan ZHANG ◽

Kai LIAO ◽

Yun-xin WU

Keyword(s):

Plastic Deformation ◽

Aluminum Alloy ◽

Alloy Plate ◽

Aluminum Alloy Plate ◽

Strain Model

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Study of a modified ECAP die for producing nanostructured Al6060 alloy using 3D finite element simulation

MRS Proceedings ◽

10.1557/opl.2016.80 ◽

2016 ◽

Vol 1818 ◽

Author(s):

M. A. González-Lozano ◽

P. Ponce-Peña ◽

M.A. Escobedo-Bretado ◽

R.H. Lara-Castro ◽

B. X. Ochoa-Salazar

Keyword(s):

Plastic Deformation ◽

Finite Element ◽

Severe Plastic Deformation ◽

Tensile Stress ◽

Deformation Zone ◽

Plastic Deformation Zone ◽

Element Analysis ◽

Ecap Processing ◽

Angular Pressing ◽

Element Simulation

ABSTRACTUsing Finite Element Method (FEM) simulations is possible to study the homogeneity of deformation in the Equal Channel Angular Pressing (ECAP) process. In this work an investigation about the influence of a modified die on strain distribution in an ecaped Al6060 alloy was carried out. Due to that, tensile stress occurs in the vicinity of upper surface of the specimen in the severe plastic deformation zone, which increases the cracking and fracture tendency of the specimen and impedes further ECAP processing, the conventional ECAP die was modified to eliminate the tensile stress and enhance the compressive stress in the severe plastic deformation zone and reducing the cracking and fracture tendency of the specimen. Finite element analysis demonstrated that the stress state changes from tensile to strongly compressive when using the modified die. The aim of this study is to evaluate the advantages/disadvantages of the modified ECAP die and processing conditions.

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