# Instead of calculating why we not measure the stress?

Instead of calculating why we not measure the stress?

For.e.g

To check the temperature of water we need thermometer.

Ammeter used to measure the electric current,

Anemometer used to measure the wind speed,

Astrolabe used to measure the latitude and altitude of celestial body,

Audiometer used to measure the hearing purpose.

Instead of calculating why we not measure the stress?

Barometer used to measure the pressure,

there are to ways to  know the value of anything  i.e either you calculate or measure.

Like, In ancient time , instead of measuring we use to calculate the blood pressure of patient.

so from above , we can get the idea to measure the stress of  material  by using stress measuring device .

As we know , no practical possible without theory and theory based on observation.

Application:

stress measuring device can help to know about deformation occur on material by applying load at per unit area.

In engineering ,

stress is a internal resistive force to the deformation per unit area.

σ=p/A

where,

σ=stress

A=Area

There are 3 type of stress ,

• Tensile stress
• Compressive stress
• Shearing stress So like that putting a theoretical formula and by designing and programming we can make stress measuring device.

Difference between the pressure and stress, Normally , we say that” pressure is stress”

But its not like that , for any machine

stress is a internal resistive force to the deformation per unit area.

unit – N/m²

But,

Pressure is force per unit area.

P=F/A

unit-N/m²

Due to stress , the pressure will not develop .

But, Due to pressure the stress will develop

so we cannot say that pressure and stress and same .

So Basically the conclusion is pressure has measuring device ,but stress do  not have measuring device.

Although ,

we have stress measuring machine but not a stress measuring device.

S0, by using stress measuring device we can get the stress value of any material at any direction.