Atomically resolved cementite dissolution governed by the strain state in pearlite steel wires

2015 ◽  
Vol 108 ◽  
pp. 151-155 ◽  
Author(s):  
Chan-Woo Bang ◽  
Jae-Bok Seol ◽  
Yo-Sep Yang ◽  
Chan-Gyung Park
Keyword(s):  
Strain State ◽  
Steel Wires ◽  
Cementite Dissolution

Cementite dissolution in heavily cold drawn pearlitic steel wires

1997 ◽  
Vol 45 (3) ◽  
pp. 1201-1212 ◽  
Author(s):  
J. Languillaume ◽  
G. Kapelski ◽  
B. Baudelet
Keyword(s):  
Pearlitic Steel ◽  
Steel Wires ◽  
Cementite Dissolution

Effect of interlamellar spacing on cementite dissolution during wire drawing of pearlitic steel wires

2000 ◽  
Vol 42 (5) ◽  
pp. 457-463 ◽  
Author(s):  
Wong Jong Nam ◽  
Chul Min Bae ◽  
Sei J Oh ◽  
Soon-Ju Kwon
Keyword(s):  
Interlamellar Spacing ◽  
Pearlitic Steel ◽  
Wire Drawing ◽  
Steel Wires ◽  
Cementite Dissolution

On the Role of Double Die Angle on the Hydrogen Embrittlement of Cold Drawn Prestressing Steel Wires

2015 ◽  
Vol 665 ◽  
pp. 245-248
Author(s):  
Jesús Toribio ◽  
Miguel Lorenzo ◽  
Diego Vergara
Keyword(s):  
Residual Stress ◽  
Hydrogen Embrittlement ◽  
Plastic Strain ◽  
Strain State ◽  
Cold Drawing ◽  
Stress Generation ◽  
Prestressing Steel ◽  
Residual Stress State ◽  
Drawing Die ◽  
Steel Wires

Residual stresses produced by cold drawing are an undesirable effect of the non-uniform plastic strain distribution generated during the conforming process used for obtaining prestressing steel wires. Among the diverse parameters of the process influencing the residual stress generation, one of the most relevant is the geometry of the drawing die and, in particular, the inlet die angle. Wires drawn with die angles as low as possible will exhibit a lower and more homogeneous plastic strain state and, therefore, a smaller and more uniform residual stress state. Thus, the hydrogen embrittlement (HE) susceptibility of such wires is also lower, thereby enlarging the life in service of these components. In this paper an innovative design of the drawing die is proposed using two consecutive angles (i.e.,varying die angle) for reducing the residual stress-strain state in the cold drawn wires and, consequently, for improving the resistance to HE of prestressing steel wires.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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