Mechanical Engineering Portal

There are many theories of fatigue; I have written briefly about three of them: the Orowan theory, the fatigue limit theory, and Wood’s theory. 1. Orowan Theory: Orowan theory considers the metal to contain small, weak regions. Slip occurs readily along these regio…

A key is a machine element fitted in an axial direction into the mating member, such as pulleys, gears. The key's primary function is to prevent the relative rotation between the shaft and mating member. In most applications, the keys' secondary function is to…

A feeler gauge is an instrument used to measure gap widths between two flat surfaces where it is difficult to reach. It is found in the metrology section. Feeler gauge consists of small steel lengths (leaves or blades) of different thicknesses with measurements label…

The failure of the tool is taking place in the following modes: 1. Failure through plastic deformation:  During machining operation, when the tool tip exceeds the hot hardness temperature of the tool material, the tool loses its hardness considerably and the tool tip …

Solid fuels can be classified into two types, they are primary fuels and secondary fuels. Primary Fuels: Wood: It is the most commonly used and easily available natural fuel. It has been used for cooking and other purposes for centuries. The important constituents…

In statics, Lami’s theorem is an equation that relates the magnitudes of three coplanar, concurrent, and non-collinear forces that keep a body in static equilibrium. Lami’s theorem states that if three forces acting at a point are in equilibrium, each force is propo…

Iron and Steel's microconstituents are Austenite, Ferrite, Cementide, Pearlite, Bainite, Martenite, Troostite, Sorbite, and Ledeburite. Austenite (γ-iron):  It is a solid solution of ferrite iron carbide in gamma iron, which is formed when steel contains carbon u…