Destructive testing q

Question 1

Discuss 5 precautions to be observed when preforming Hardness testing

Answer 1

1. is correct load applied
2. impact loading must be avoided
3. condition of the indenter is very important
4. the anvil must be kept in good condition and must be clean and smooth
5. great care must be taken in measuring the size of an indentation
6. the thickness of the specimen is very important
7. surface should be flat
8. specimen should be firmly supported

Question 2

Define hardness and name 3 method’s of testing hardness

Question 3

Draw and label a stress strain curve for a mild steel

Question 4

what does the fracture surface of a nick break test reveal

Question 5

list 3 type of bed test and what types of defects are revealed by each test

Answer 5

face bends - weld quality
root bend - lof, lop , root defects
side bend - internal defects

Question 6

draw a CTS test

Question 7

What does a macro examination reveal

Question 8

Name 2 properties That are indicated by a notch impact test

Answer 8

Notch Toughness
notch sensitivity

Question 9

Drave a ductile to brittle transition curve for a sharpy v notch impact specimen