When a single crystal is continued to be deformed in the plastic range beyond the yield point, the shear stress required to produce further deformation continues to increase. The increase in the stress required to continue the deformation because of the previous plastic deformation is called as strain-hardening, or work-hardening. As the dislocation density also increases simultaneously with strain (dislocation [...]
In this article we will discuss about the meaning and process of mass transfer. Meaning of Mass Transfer: When a system contains two or more components whose concentrations vary from point to point, there is a natural tendency for mass to be transferred, minimising the concentration differences within the system. The transport of one constituent from a region of higher [...]
In this article we will discuss about:- 1. Meaning of Electromagnetism 2. Determination of Direction of Magnetic Field around a Current Carrying Conductor 3. Solenoid 4. Magnetic Circuit 5. Magnetic Circuits with Air-Gaps. Meaning of Electromagnetism: A magnet produced by passing an electric current through an insulated wire wound around a core of soft iron, as in the fields of [...]
In this article we will discuss about:- 1. Introduction to Process of Magnetism 2. Production of EMF 3. Faraday's Laws of Electro-Magnetic Induction 4. Lenz's Law 5. Induced EMF 6. AC Excitation 7. Magnetic Hysteresis 8. Energy Expended 9. Energy Stored. Contents: Introduction to the Process of Magnetism Production of EMF Faraday's Laws of Electro-Magnetic Induction Lenz's Law Induced EMF [...]
In this article we will discuss about:- 1. Meaning of Electroforming 2. Process of Electroforming 3. Advantages 4. Limitations. Meaning of Electroforming: This is the process of forming metals. The parts of various shapes are produced by electrolytic deposition of metal upon a conductive removable mould. The difference between electroplating and electroforming being that in the former case the metal [...]
Electrochemical wire cutting process for removal of metal using a wire tool as cathode and workpiece as anode. The workpiece can be shaped by relative movement between it and the wire. The process is similar to wire discharge machining. This process is found to be best suited for cutting in one or two directions and fine drilling. Rectangular wire appears [...]
In this article we will discuss about:- 1. Meaning of Jig Boring 2. Description of Jig Boring 3. Types 4. Machine. Meaning of Jig Boring: Jig borers are used for locating accurately and making the numerous holes necessary for jigs, fixtures, gauges and other precision parts. Although the single-point boring bar is the most important tool used in jig borers, [...]
The three fundamentals steps for making a hole by drilling. The steps are: 1. Locating 2. Cutting 3. Checking. Step # 1. Locating: In making any hole by drilling, boring or any other operation, its exact location at the desired position in the work is utmost. It can be accomplished in the four important ways discussed below: (a) Lay Out: [...]