Skip to main content

Types of stress

A stress acts on a body may be normal stress or shear stress.

A stress acts on a body may be normal stress or shear stress.

Normal Stress: Normal stress is a stress that acts perpendicular to the area.
The formula for the normal stress is given by




The normal stress is again subdivided into two parts.

Tensile Stress: The stress which induced in a body when it is subjected to two equal and opposite pulls as shown in the figure given below is called tensile stress.

  • Due to the tensile stress there is an increase in the length of the body and decrease in the cross section area of the body.
  • Tensile stress is a type of normal stress, so it acts at 90 degree to the area.
  • The strain which is induced due to tensile stress is called tensile strain. It is equals to the ratio of increase in the length to the original length.


Compressive Stress: The stress which induced in a body when it is subjected to two equal and opposite pushes as shown in the figure given below is called compressive stress.



  • Due to the compressive stress, there is a decrease in the length and increase in the cross section area of the body.
  • Compressive stress is also a type of normal stress and so it also acts at 90 degree to the area.
  • The strain which is induced due to compressive stress is called compressive strain. It is equals to the ratio of decrease in the length to the original length.


Shear Stress: Shear stress induced in a body when it is subjected to two equal and opposite forces that acts tangential to the area.

  • The strain produced due to the shear stress is called shear strain.
  • The shear stress is denoted by the symbol τ (tau). It is a Greek letter.
  • It is defined as ratio of shear resistance to the shear area.
  • The formula for the shear stress is given below.





Shear stress is responsible for the change in the shape of the body. It does on affect the volume of the body.
Labels:

Comments

Post a Comment

Popular posts from this blog

Hardy slab and where it use

  HARDY SLAB :- These kind of slabs are generally seen in Dubai and China. This  slab is constructed by hardy Bricks. Hardy bricks are hollow bricks and made up of concrete Hollow blocks are used to fill portions of the slab thickness it saves the  amount of concrete and hence the own weight of the slab is reduced. This kind of slab has a more thickness when compared with the conventional one. The thickness of hardy slab is 0.27m. The method of installing Hardy slab is different from normal  and it is clearly explained below: This is a one of the types of concrete slabs. The dimensions of Hardy brick is 40cm x 20cm x 20cm The process of execution is as follows: Step 1   : Formwork is arranged and then shutters are fixed on the formwork. Step 2  : Hardy blocks are placed on the shutter with one brick gap on the entire shutter. Step 3  : The gaps between the bricks are called as rib. Reinforcement is provided in a form of beam within the ...
4 comments
Read more

About slump cone test in concrete

Concrete Slump Test for Workability -Procedure and Results. Concrete slump test is to determine the workability or consistency of concrete mix prepared at the laboratory or the construction site during the progress of the work. Procedure for Concrete Slump Test: Clean the internal surface of the mould and apply oil. Place the mould on a smooth horizontal non- porous base plate. Fill the mould with the prepared concrete mix in 4 approximately equal layers. Tamp each layer with 25 strokes of the rounded end of the tamping rod in a uniform manner over the cross section of the mould. For the subsequent layers, the tamping should penetrate into the underlying layer. Remove the excess concrete and level the surface with a trowel. Clean away the mortar or water leaked out between the mould and the base plate. Raise the mould from the concrete immediately and slowly in vertical direction. Measure the slump as the difference between the height of the mould and that of height poin...
1 comment
Read more

Waffle slab and where to use

  WAFFLE SLAB :- Waffle slab is a reinforced concrete roof or floor containing square grids with deep sides. This kind of slab is majorly used at entrance of hotels, Malls, Restaurants for good pictorial view and to install artificial lighting. This a  type of slab where we find hollow hole in the slab when the formwork is removed.  Firstly PVC trays (pods) are placed on shuttering then reinforcement is provided between the pods and steel mesh is provided at top of the pods and then concrete is filled. After concrete sets the formwork is removed and PVC pods are not removed. This forms hollow hole in it in which hole is closed at one end. The concrete waffle slab is often used for industrial and commercial buildings while wood and metal waffle slabs are used in many other construction sites. This is a one of the types of concrete slabs. Where to use? A waffle slab is a type of slab with holes underneath, giving an appearance of waffles. It is usually used where lar...
3 comments
Read more