Summary
After study of material science we
came to know that: What is ductile & brittle material?
Application areas of these materials, for example brittle
material is hard so we can use it where impact loading will be high and ductile
material is soft so it can be used where there is some vibration and high speed
rotation.
So why we are going to read this post, let us understand
what we will secure after reading this post.
- We will come to know about the properties of such materials e.g. physical, mechanical & thermal properties after reading this post.
- We will come to know how we can measure & express the hardness of such material.
- We will come to know that behavior of such materials under different type of loading like bending load, shear load, tensile load & compressive load.
- We will also come to know about insulation & its purpose.
Introduction
Material science is a study field
that enable us to know which type of material & where we can use such
material. It also gives information about different type of material and also
tells us that how we can design of any construction element or any engineering
element with high factor of safety.
We should select material for any application after studying of all the factors related to that application.
We should select material for any application after studying of all the factors related to that application.
Problems in material selection
There is some problems during
materials selection, (I am giving very brief and if you require details pls.
tell me I can give you the details knowledge about the issues during material
selection.)
- Environmental problems in material selection.
- Economical and price analysis problems in material selection.
- Design of any engineering components is limited by the materials that are available.
- Selection of material according to Mechanical properties that we require is very crucial job.
- Manufacturing & processing problems.
- There are lots of materials is available and we have to select as per our customer and design requirement.
Let us brief the study of the
mechanical behaviour of materials and we will also discuss the basic mechanical
properties of the construction materials
such as steel, concrete and timber.
Diagram
1: Stress-strain diagram of steel
Structures are subjected with
different types of load, structure are made with different types of
construction & engineering materials.
The properties that calculate the
behaviour of material in a structure under different types of loading is called
mechanical properties .These properties are calculated by testing of specimen
of materials.
Stress
When a force is acting on a object
and tends to deform the object, the materials of the object exerts an internal
resistance force to oppose the changing in dimensions. This internal resistance
force per unit area is called as Stress. Its unit is N/m2
Strain
It is defined as change in dimension
to original dimension. It is unit less
Area = A, change in length = ∆l
Area = A, change in length = ∆l
Stress =
P/A and strain = ∆l/L
Stress is
directly proportional to strain- according to Hooks law.
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