What is the impact hardness test? Why do we test for impact test? impact testing methods

 

What is impact test?

The impact test involves subjecting a coated sample to controlled impacts and observing the resulting damage. The severity of the impact is gradually increased until visible damage, such as cracking, chipping, or detachment of the coating, occurs. The test can be conducted using different methods and equipment, such as pendulum impact testers or falling weight impact testers, depending on the testing standards and the specific requirements of the project.

Standards for Impact test?

The remaining impact test standards lay down the use of absolute units of energy:

kg m (ISO 6272, ASTM D 2794),

Joule (ASTM D 3029, ECCA T5),

inch lbs (ASTM D 2794 and ASTM D 3029).

1 (Joule) = 0.1 kg m = 8.8 inch lbs

 

 

 

Calculation

Impact Force calculation: If a weight (m) 1.5 kg falling from height (h) of 0.65m. So, what will be the force (lbs per square inch)?

 

Velocity (v)=√2gh= √2X9.81X0.65=3.57

So, 

                = ½ X1.5X(3.57)^2

                =9.558 Joule

We know, 1Joule=0.1kgm=8.8 lbs/ square inch

So. 9.558Joule= 8.8X9.558=84.1104 inch-lbs/square inch

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