Slip Line Field Method - Presentation

Dr.Ramaswamy Narayanasamy

Slip line field method and its application in forming process Manufacturing Process Class - Final year

Engineering

SSLIPLIP LLINEINE FFIELDIELD
MMETHODETHOD
AND ITSAND ITS
AAPPLICATION INPPLICATION IN
FFORMINGORMING
PPROCESSROCESS
Group 1Group 1
(Roll No. 49,50,51,52)(Roll No. 49,50,51,52)

Slip ?
process which allows plastic flow to
occur in metals , where the crystal
planes slide past one another

Why ?
force required for the entire block
of crystals to slide is very large
lower level of stress is required

Slip Line Field ?
 Orthogonal networks of the
lines of maximum shear stress
 The slip line patterns above
are very useful for analyzing
plane strain deformation in a
rigid-plastic isotropic solid

Slip Line Field ?
Slip-line field for compression between a pair of rough
parallel platens

Slip Line
Field Method
It is an approach used to model
plastic deformation in plane
strain only for a solid that can
be represented as a rigid-plastic
body.

Rigid-Plastic Material
Response
 no elastic
deformation
and perfect
plastic
deformation
Fig 1. Rigid Plastic Material Response

 In deformations of
practical interest one of
the principal strains (say )
is zero
 It is applicable to rolling ,
drawing and forging.
Plane Strain

EXAMPLES
 Try to use Slip Line Field Method to
solve some problems
 To determine the value of force (P)

Rigid Punch Indenting a Plastic Solid
Solution:

Plane Strain Extrusion (Hill)
α
slip-line
slip-line
β
H 2H
30o
45o
45o
P
A
B
C
D
a
b E
F
e1
e2

Plane Strain Extrusion (Hill)
σ22
σσ11
τ
σ
kσ
σ
k
π/3k
nn
ab

Plane Strain Extrusion (Hill)
@ a
@ b
resultant force acting on CD and AB
Thus required force P=
-2k

Double-Notched Plate In Tension
α slip-line slip-lineβ
α
P
P
α
a
A
B

REFERENCE
S
 G K Lal , Introduction to Machining Science.
 http://solidmechanics.org/text/Chapter6_1/Chapter6_1.htm
 http://www.engin.brown.edu/courses/en222/Notes/sliplines/sli
plines.htm
 http://www.globalspec.com/reference/70308/203279/html-
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I1302035763

IOSR Journals

This document summarizes a study on plastic zone size and effective distance under mixed mode fracture using a volumetric approach. U-notched circular ring specimens made of 45CDS6 steel were subjected to compression loading with notch radii ranging from 0.15-2mm and angles from 0-33 degrees. Finite element analysis was conducted to determine stress distributions. Two methods were used to evaluate plastic zone size - the volumetric method relating it to effective stress and notch stress intensity factor, and the von Mises yield criterion. The plastic zone sizes determined from both methods showed good agreement. A new model was proposed to evaluate plastic zone size under mixed mode fracture conditions.

Wear of polymers

Ahmed Abdelbary

This textbook covers the wear of polymers and composites. It discusses key topics in polymer tribology including the factors that affect the friction and wear of polymers like sliding speed, temperature, load and surface roughness. It also examines the sliding mechanics of polymers such as the formation of transfer films, different wear regimes, flash temperature generation and the third body effect. Finally, it analyzes the fatigue wear of unfilled polymers under fluctuating loads and the influence of surface defects on wear. The book provides a comprehensive introduction to polymer tribology and the mechanisms that govern the wear of polymers.

FRACTURE BEHAVIOUR OF NANOCOMPOSITES -FATIGUE

Arjun K Gopi

This document discusses the fracture and fatigue behavior of polymer nanocomposites. It notes that nanoparticles have higher specific surface areas than microparticles, which can improve stress transfer and that nanoparticles can be added at lower loadings while retaining properties of the neat polymer matrix. The document covers different types of fractures like brittle and ductile, and describes how the addition of nanoparticles up to 5 wt% can improve the fatigue resistance of polyamide nanocomposites by inhibiting crack propagation, but higher loadings may embrittle the material. TEM images show the differences in clay dispersion with varying nanoparticle content.

Dislocation depletion in thin films

Kedarnath Kolluri

This document discusses molecular dynamics simulations of the mechanical behavior of confined metallic systems. It begins by motivating the study of confined defects in metals through examples of metallic interconnects in semiconductors. It then summarizes simulations performed on copper thin films of varying thickness under different strain conditions. The simulations revealed stages of elastic response, dislocation annihilation, insufficient plastic flow leading to stress increases, and eventual nucleation of additional dislocations and material failure. Comparisons are made between copper, nickel and aluminum thin films, showing differences in their stress-strain behavior related to their stable stacking fault energies. The document analyzes mechanisms like dislocation-stacking fault interactions that lead to dislocation annihilation.

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I1302035763

Wear of polymers

FRACTURE BEHAVIOUR OF NANOCOMPOSITES -FATIGUE

Dislocation depletion in thin films

More from Santosh Verma

Exergy Based Performance Analysis of FGPS (NTPC Faridabad)

The document discusses exergy analysis of a combined gas power station. It calculates the energy and exergy flows for various systems like the compressor, high pressure turbine, and low pressure turbine. The analysis found that the compressor had the highest exergy destruction, followed by the low pressure turbine and high pressure turbine. The conclusion is that minimizing exergy destruction in these components, especially the compressor, through proper operation and maintenance could improve the plant's efficiency.

Dielectric breakdown in liquids purity

This document discusses the purity aspects of liquid dielectrics and how it affects dielectric breakdown. It explains that the purity of a liquid dielectric impacts properties like dielectric strength, ion size, viscosity, and density. Pure liquid dielectrics exhibit different breakdown behavior than impure liquids, which can be modified by dissolved gases and impurities. Factors like temperature, pressure, electrode shape and position, frequency, and viscosity can further influence the dielectric strength and breakdown of both pure and impure liquid dielectrics.

A Study on Liquid Dielectric Breakdown in Micro-EDM Discharge - Cognitio paper

The research work carried out in this paper, aims at understanding the breakdown phenomenon of liquid dielectric by the low energy ultra-short pulsed electric discharge produced between tiny electrodes (~ 100µm diameter electrode) through experimental studies In literature not many studies are reported on liquid dielectric breakdown mechanism, and in micro-EDM no published literature discusses about this. Therefore, a detailed study on literature has been performed and preliminary experiments have conducted on micro-EDM to understand the glow discharge and its breakdown phenomenon better, towards validation of scientific analogies for micro-EDM process conditions.

A Study on Liquid Dielectric Breakdown in Micro-EDM Discharge

The growing interest in applications of micro-nano scale devices in many applications diversified the market demand towards batch production of multi material micro parts. Therefore, innovative integration and development of knowledge base for scaling up of production by precision manufacturing technologies to ensure effective industrial utilization has become the primary focused area of micro-nano scale manufacturing research. There is a huge demand in the production of microstructures by a non-traditional method which is known as Micro-EDM. Micro-EDM process is based on the thermoelectric energy between the work piece and an electrode. Micro-EDM is a newly developed method to produce micro-parts which are in the range of 50 µm -100 µm. Micro-EDM is an efficient machining process for the fabrication of a micro-metal hole with various advantages resulting from its characteristics of non-contact and thermal process.

Variational Solution of Axisymmetric Fluid Flow in Tubes with Surface So...

The problem of axisymmetric heat conduction with internal surface solidification in the regions of tube is discussed. An approximate analytical solution is presented to this nonlinear, two dimensional free boundary problem. The analysis employs a variational technique which extends the Lagrangian formalism to treat the internal flow, two-dimensional moving-interface problems. The solution is expressed in the terms of the short-time and steady-state components. Two forms of the variational solution are presented. One has limited validity in the entrance region of the tube, and the other, while less general , is more accurate.

Ensuring Affordable Fuel Security for NTPC - Presentation

This document outlines fuel security issues facing NTPC and proposes solutions. It notes that NTPC is facing shortfalls in coal availability and affordability due to low domestic production, outdated mining technology, and fluctuations in the rupee. It proposes an integrated approach for NTPC's energy portfolio that emphasizes renewable energy, nuclear power, gas, and small hydro to reduce imported coal dependence. Near-term solutions include developing allotted coal blocks, acquiring overseas coal mine assets, and improving domestic coal transportation infrastructure. Long-term strategies involve procuring lower quality coal and retrofitting plants to support a more diverse, secure fuel supply.

ENSURING AFFORDABLE FUEL SECURITY FOR NTPC

This document discusses India's energy security and fuel scenario, with a focus on NTPC's fuel needs and challenges. It provides an overview of India's growing energy demand and dependence on fossil fuels like coal for power generation. Coal is the main fuel for over 50% of India's primary energy and 69% of power generation, but there are issues with domestic coal supply that affect NTPC's plants. The document analyzes challenges related to coal, oil and gas, nuclear, and renewable sources. It recommends solutions like increasing domestic coal production, diversifying NTPC's fuel mix through renewable and nuclear sources, and establishing an effective framework for fuel supply agreements.

Book review

The document summarizes information about Rabindranath Tagore, an Indian writer and Nobel laureate. It provides details about his published works, including his first published poem in 1874, winning the Nobel Prize in Literature in 1913, being knighted in 1915, establishing Visva-Bharati University in 1921, and writing over 2,000 songs. It also describes the collection of 30 short stories translated by William Radice, noting they depict various aspects of contemporary life in rural and urban Bengal and focus on human nature and relationships.

NTPC Rihand CHP Stage # 3