Statics and Strength of Materials

Written by on November 2, 2011 in Struct. Sys - Comments Off

“Be like bamboo, supple yet strong.” – Some Great SE Movie

Strength of Materials.

The strength of materials involves material science

The strength of a material is its ability to withstand an applied stress without failure

Yield strength refers to the point on the engineering stress-strain curve (see below) beyond which the material begins deformation that cannot be reversed upon removal of the loading

Applied Stresses can be any of the following:

Tensile or Tension (see below)

A force related to the stretching of an object (the opposite of compression)

Compressive or Compression (see below)

Measures the pushing force that one needs to break a material

When the limit of compressive strength is reached, materials are crushed

Shearing (See Below)
Shearing is a deformation of a material substance in which parallel internal surfaces slide past one another. It is induced by a shear stress in the material

 Torsion (see below)

Torsion is the twisting of an object due to an applied torque

A material’s strength is dependent on its microstructure

The engineering processes to which a material is subjected can alter this microstructure, these engineering processes are the following:

Work hardening 

Work hardening, also known as strain hardening, is the strengthening of a metal by plastic deformation

Solid solution strengthening

 Solid solution strengthening is a type of alloying that can be used to improve the strength of a pure metal

Precipitation hardening

Precipitation hardening, also called age hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel and titanium, and some stainless steels

Grain boundary strengthening

Grain-boundary strengthening (or Hall-Petch strengthening) is a method of strengthening materials by changing their average crystallite (grain) size

The effects of dynamic loading is the most important practical part of the strength of materials, especially the problem of fatigue, repeated loading often initiates brittle cracks, which grow slowly until failure occurs

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