Skip to main content

CHARPY V NOTCH IMPACT TEST


CHARPY V NOTCH IMPACT TEST

Object: To determine the amount of energy absorbed in fracturing a standardized test piece at a specified temperature.

Method: A machined, notched specimen is broken by one blow from a pendulum. Because scatter occurs in the results, at least three specimens are used to assess the joint represented. Testing is carried out at a temperature specified in the appropriate application standard.

CHARPY V NOTCH IMPACT TEST
Reporting Results:
  1. Location and orientation of the notch. 
  2. Testing temperature.
  3. Energy absorbed in joules. 
  4. Description of fracture appearance.
  5. Location of any defects.
CHARPY V NOTCH IMPACT TEST

The Charpy impact test, measured in joules, is an assessment of TOUGHNESS. Transition temperature (curve) in steel.



Labels:

Popular posts from this blog

Part -1 to 8 Most commonly asked Mechanical Interview Questions with answer

Mechanical Interview Questions with answer Part -1 (published on 14.09.2017) Part -2 (published on 15.09.2017) Part -3 (published on 16.09.2017) Part -4 (published on 18.09.2017) Part -5 (published on 19.09.2017) Part -6 (published on 20.09.2017) Part -7 (published on 21.09.2017) Part -8 (published on 22.09.2017)
Read more

What is Annealing ?

Annealing:- Annealing  Process :- Annealing is a heat treatment process by which the properties of steel are enhanced to meet machinability requirements. In this process Hypoeutectoid steels (less than 0.83% carbon) are heated above upper critical temp., soaked and cooled slowly and  Hypereutecoid (above 0.83%) are heated above lower critical temp., soaked and allowed to cool slowly. Annealing  Process Steps: 1.Heat material into the asutenite region (i.e. above 1600F) – rule of thumb: hold   steel for one hour for each one inch of thickness 2.Slowly furnace cool the steel – DO NOT QUENCH 3.Key slow cooling allows the C to precipitate out so resulting structure is coarse  pearlite with excess ferrite 4.After annealing steel is quite soft and ductile The purpose of Annealing is : 1)Reduce hardness and brittleness 2)Alter microstructure for desired mechanical properties 3)Soften...
Read more