A New Stretching Process: Slant Forging Method

2011 ◽  
Vol 181-182 ◽  
pp. 113-117
Author(s):  
Li Yong Ni ◽  
Suo Qing Yu ◽  
L. Li ◽  
S.Y. Zhu ◽  
Hua Gui Huang
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
High Performance ◽  
Flow Direction ◽  
Metal Flow ◽  
Production Costs ◽  
Flow Lines ◽  
Forging Process ◽  
Stretching Process ◽  
Selection Of

High transversal properties requirements of heavy axial forgings, traditionally, often are met through the selection of high-performance materials, the improvement of metallurgical quality and repeated forging. But the production costs and power consumption are both high. A new slant forging method is adopted, by controlling the metal flow direction in forgings, to achieve the increase of transversal mechanical properties. Finite element method was applied to study the influence of forging process parameters on flow lines in axial forgings, providing theoretical guidance for the eventual realization of the forging method.

Application of FEM Modeling to Simulate Metal Flow in Forging a Titanium Alloy Engine Disk

1983 ◽  
Vol 105 (4) ◽  
pp. 251-258 ◽  
Author(s):  
S. I. Oh ◽  
J. J. Park ◽  
S. Kobayashi ◽  
T. Altan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Titanium Alloy ◽  
Metal Flow ◽  
The Finite Element Method ◽  
Fem Modeling ◽  
Forging Process ◽  
Deformation Mechanics ◽  
Effects Of Temperature ◽  
Element Method

The isothermal forging of a titanium alloy engine disk is analyzed by the rigid-viscoplastic finite element method. Deformation mechanics of the forging process are discussed, based on the solution. The effects of temperature and heat conduction on the forging process are also investigated by coupled thermo-viscoplastic analysis. Since the dual microstructure / property titanium disk can be obtained by controlling strain distribution during forging, the process modeling by the finite element method is especially attractive.

scholarly journals Basic Principles in the Design of Spider Silk Fibers

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1794
Author(s):  
José Pérez-Rigueiro ◽  
Manuel Elices ◽  
Gustavo R. Plaza ◽  
Gustavo V. Guinea
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Spider Silk ◽  
Design Principles ◽  
Tensile Behavior ◽  
Original Design ◽  
Basic Principles ◽  
Silk Fibers ◽  
The Relationship ◽  
Selection Of

The prominence of spider silk as a hallmark in biomimetics relies not only on its unrivalled mechanical properties, but also on how these properties are the result of a set of original design principles. In this sense, the study of spider silk summarizes most of the main topics relevant to the field and, consequently, offers a nice example on how these topics could be considered in other biomimetic systems. This review is intended to present a selection of some of the essential design principles that underlie the singular microstructure of major ampullate gland silk, as well as to show how the interplay between them leads to the outstanding tensile behavior of spider silk. Following this rationale, the mechanical behavior of the material is analyzed in detail and connected with its main microstructural features, specifically with those derived from the semicrystalline organization of the fibers. Establishing the relationship between mechanical properties and microstructure in spider silk not only offers a vivid image of the paths explored by nature in the search for high performance materials, but is also a valuable guide for the development of new artificial fibers inspired in their natural counterparts.

scholarly journals RESEARCH OF METHOD OF CALCULATION AND SELECTION OF TECHNOLOGICAL PARAMETERS OF STAMPING WRAPPED WITH COMPLEX PROFILE PRODUCTS USING COMPUTER SIMULATION

2020 ◽  
pp. 123-133
Author(s):  
Mykola Kolisnyk ◽  
Maxim Sluzalyuk
Keyword(s):  
Shape Change ◽  
Flow Direction ◽  
Metal Flow ◽  
Technological Capabilities ◽  
Complex Profile ◽  
Technological Parameters ◽  
Stress Strain ◽  
Workpiece Material ◽  
Backward Extrusion ◽  
Selection Of

The article conducted a study of calculation methods and the selection of technological parameters for stamping by rolling in complex profile products. It is shown that the achievement of significant sizes of various elements of the workpiece is possible by ensuring the directional flow of metal by changing the relative positions of the roll and the workpiece. The most effective rolling stamping operations are upsetting, deposition and backward extrusion. The zones of workpieces that are deformed under stress conditions have been identified, therefore, to determine the technological capabilities for them, an assessment of the deformation of metals should be carried out. The manufacture of thin-walled elements of the workpiece using the operation of backward extrusion is accompanied by the appearance of significant contact stresses, therefore, to prevent the roll from being removed from the workpiece, back-up rollers should be provided. The analysis of the study showed that the stamping process by rolling over the workpieces with conical and cylindrical rolls makes it possible to control the flow direction of the workpiece material by changing the size and direction of the relative position of the axes of the workpiece roll, relative to the direction of rotation of the workpiece. The technological capabilities of SHO are limited mainly by the loss of stability and destruction of the workpieces, which, in turn, substantially depends on the direction of the metal flow in the contact of the roll with the workpiece. The modeling of the SHO process is considered. It has shown that the stress-strain state, the shape change and the deformability of the workpiece material substantially depend on these parameters. The purpose of the simulation was to analyze the stress-strain (VAT) state and shape change of the workpieces during the deformation process, to determine the energy-power parameters of the process, as well as the geometry of the deforming tool, providing a high-quality product with guaranteed profile filling, accurate dimensions in the transverse and longitudinal directions, as well as surface cleanliness profiled cavity.

scholarly journals Effect of Variations in Microwave Processing Temperatures on Microstructural and Mechanical Properties of AA7075/SiC/Graphite Hybrid Composite Fabricated by Powder Metallurgy Techniques

2021 ◽  
Author(s):  
Manohar Guttikonda ◽  
K M Pandey ◽  
S R Maity
Keyword(s):  
Mechanical Properties ◽  
Hybrid Composite ◽  
High Performance ◽  
Volume Fraction ◽  
Hybrid Composites ◽  
Microwave Sintering ◽  
Modern World ◽  
Matrix Composites ◽  
Average Grain Size ◽  
Selection Of

Abstract Due to the demand in present industrial, aerospace, defense sectors for lightweight high-performance aluminum (Al) particle-reinforced metal matrix composites, the advancement of techniques to fabricate these composites with superior mechanical properties have gained technological interest in the modern world. In this direction, SiC and graphite reinforced AA7075 matrix composite material has been fabricated in this study, through hybrid microwave sintering techniques. The microwave sintering temperatures for the optimized volume fraction composition of AA7075/SiC/graphite hybrid composite has been varied from 400 to 550 ℃ with a step value of 50 ℃. The obtained results showed a superior improvement in the mechanical properties for microwave sintered composites as compared to the conventionally sintered composites. Mechanical properties are found to show increasing trend with increasing microwave sintering temperatures up to 500 ℃, after that, a downfall is observed in their mechanical properties, which can be attributed to the increased average grain size of the composite at 550 ℃. Selection of SiC as primary reinforcement material helped in achieving high mechanical strengths, and through microwave sintering, an increment of 37.2% in tensile, 26.6% in compression, and 16.5% in hardness is achieved. From this investigation, it is also observed that the selection of materials that shows high response to microwaves helps in achieving the enhanced mechanical properties for the hybrid composites processed by microwave sintering techniques.

Influence of Anvil Geometry on Stretching Process of Cylinder Forging with Materials Properties in Materials Engineering

2013 ◽  
Vol 661 ◽  
pp. 91-94
Author(s):  
Yong Hua Li ◽  
Jing Zhang ◽  
Wei Yi Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Metal Flow ◽  
Tool Geometry ◽  
Materials Properties ◽  
Materials Engineering ◽  
Flow Law ◽  
Distribution State ◽  
Stretching Process

Stretching is a commonly used process to manufacture forgings with good quality. In this paper, the stretching process of cylinder forging with materials properties in materials engineering was investigated by finite element method. The metal flow law of cylinder stretching process was studied, based on the simulation and analysis of the effect of tool geometry like flat and V-shaped anvils on strain and stress distribution state in the forging. The reasonable tool geometry for stretching was V-shaped anvil.

Analysis on the Free Forging Process of the Heavy Rack for Ship Lift

2017 ◽  
Vol 865 ◽  
pp. 105-108
Author(s):  
Zheng Xing Men ◽  
Ya Xin Ma ◽  
Tai We Yue ◽  
Rui Lin Liu
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Large Scale ◽  
Feasibility Analysis ◽  
Three Gorges ◽  
The Finite Element Method ◽  
Forging Process ◽  
Ship Lift ◽  
Important Position ◽  
Application Scope

Heavy racks are the main load-bearing components and play more important position in great engineering equipments. Along with the requirement of the equipment efficiency promotion, the large-scale trend of rack is obvious. Among them, the rack for the Chinese Three Gorges ship lift total up to 5000mm. At present, the large rack mainly made by casting. Compared with the casting, the forging rack can greatly improve the mechanical properties and the service life. The aim of this work is feasibility analysis of free forging for large rack, as large T-shape section forging. Four possible forging schemes were simulated and compared by the finite element method, and the possible defects of all the schemes and their application scope were explored. Finally, it was proved that the free forging of heavy rack was realized by simple dies.

The Network Structure Formation of Cu-CNTs Composites During Multi-Directional Forging Process and its Mechanical Properties

NANO ◽  
2021 ◽  
pp. 2150070
Author(s):  
Endian Liu ◽  
Zaijiu Li ◽  
Fei Li ◽  
Bin Wang
Keyword(s):  
Mechanical Properties ◽  
Network Structure ◽  
Load Transfer ◽  
Volume Fraction ◽  
Metal Flow ◽  
Copper Particle ◽  
Distribution Patterns ◽  
Forging Process ◽  
Industrial Manufacture ◽  
Pre Treatment

Cu–[Formula: see text] CNTs composites ([Formula: see text], 1, 2, 3 vol.%) were successfully prepared using a combination of pre-treatment, powder metallurgy and multi-directional forging processes, which provides a solution for the industrial manufacture of the composites with network CNTs structures. During the multi-directional forging process, the CNTs in the composites were distributed in a network under the synergy of metal flow and copper particle squeeze. Compared with other structure modes, the network CNTs can effectively carry and transfer loads resulting in the promotion of mechanical properties (such as, the tensile strength approximately 1.5 times higher than those of composites with the same volume fraction without network structure). The composite with 2 vol.% CNTs had the highest elongation in this experiment (41%), which is about 5 times higher than the composites with other CNTs distribution patterns. At a low CNTs content level (1[Formula: see text]vol.%), a complete load transfer network cannot be formed, resulting in a relatively insufficient mechanical properties of the composites. As the content level is exceeded (3vol.%), it caused significant agglomeration of the CNTs, which lead to fracture in the agglomerated CNTs and elongation degradation of the composites.

Macroprobe Mode for the Study of Segregation in Steels

1990 ◽  
Vol 48 (2) ◽  
pp. 260-261
Author(s):  
Auclair Gilles ◽  
Benoit Danièle
Keyword(s):  
Mechanical Properties ◽  
Spatial Distribution ◽  
High Performance ◽  
Volume Fraction ◽  
Sheet Steel ◽  
Acquisition Time ◽  
Chemical Information ◽  
X Ray ◽  
Accurate Quantitative Analysis ◽  
Optical Micrographs

During these last 10 years, high performance correction procedures have been developed for classical EPMA, and it is nowadays possible to obtain accurate quantitative analysis even for soft X-ray radiations. It is also possible to perform EPMA by adapting this accurate quantitative procedures to unusual applications such as the measurement of the segregation on wide areas in as-cast and sheet steel products.The main objection for analysis of segregation in steel by means of a line-scan mode is that it requires a very heavy sampling plan to make sure that the most significant points are analyzed. Moreover only local chemical information is obtained whereas mechanical properties are also dependant on the volume fraction and the spatial distribution of highly segregated zones. For these reasons we have chosen to systematically acquire X-ray calibrated mappings which give pictures similar to optical micrographs. Although mapping requires lengthy acquisition time there is a corresponding increase in the information given by image anlysis.

Mechanical properties and durability of high - performance concrete for bridge decks

PCI Journal ◽  
2008 ◽  
Vol 53 (4) ◽  
pp. 108-130
Author(s):  
Mohsen A. Issa ◽  
Atef A. Khalil ◽  
Shahidul Islam ◽  
Paul D. Krauss
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Bridge Decks
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