MMET 207 LAB TEST REVIEW
Rockwell Regular minor 10 kg load 150 kg tests - Answers :C: diamond
K: ball (3.175 mm or 1/8 in)
G: ball (1.588 or 1/16 in)
Rockwell Regular minor 10 kg load 100 kg tests - Answers :D: diamond
E: ball (1/8 in)
B: ball (1/16 in)
Rockwell Regular minor 10 kg load 60 kg tests - Answers :A: diamond
H: ball (1/8 in)
F: ball (1/16 in)
Rockwell Superficial loading numbers - Answers :3 kg minor load
: "#-N/T"
Number indicates major load
If N, diamond penetrator, if T, then 1/16 in ball penetrator
Ex: 30-N means 30 kg major load with diamond penetrator
15, 30, 45 major loads
How far apart must two adjacent indentations for hardness testing be? - Answers :3
times the diameter of indentation to avoid...???**
How far must an indentation in hardness testing be from the edge of the specimen? -
Answers :2 and a half times the diameter of indentation, to not be affected by lack of
density and pressure
What is done differently when testing cylindrical surfaces in hardness testing? -
Answers :V-groove
What hardness scale is recommended for testing copper and annealed brass? -
Answers :HRF
Stress - Answers :Sigma=Force/cross-sec area
(psi)
Strain - Answers :"E"=(final length-orig length)/(orig length)
(inch/inch)
MOE - Answers :E=Sigma/"E"
or Stress/Strain
(psi)
% elongation - Answers :Final Strain * 100%
Rockwell Regular minor 10 kg load 150 kg tests - Answers :C: diamond
K: ball (3.175 mm or 1/8 in)
G: ball (1.588 or 1/16 in)
Rockwell Regular minor 10 kg load 100 kg tests - Answers :D: diamond
E: ball (1/8 in)
B: ball (1/16 in)
Rockwell Regular minor 10 kg load 60 kg tests - Answers :A: diamond
H: ball (1/8 in)
F: ball (1/16 in)
Rockwell Superficial loading numbers - Answers :3 kg minor load
: "#-N/T"
Number indicates major load
If N, diamond penetrator, if T, then 1/16 in ball penetrator
Ex: 30-N means 30 kg major load with diamond penetrator
15, 30, 45 major loads
How far apart must two adjacent indentations for hardness testing be? - Answers :3
times the diameter of indentation to avoid...???**
How far must an indentation in hardness testing be from the edge of the specimen? -
Answers :2 and a half times the diameter of indentation, to not be affected by lack of
density and pressure
What is done differently when testing cylindrical surfaces in hardness testing? -
Answers :V-groove
What hardness scale is recommended for testing copper and annealed brass? -
Answers :HRF
Stress - Answers :Sigma=Force/cross-sec area
(psi)
Strain - Answers :"E"=(final length-orig length)/(orig length)
(inch/inch)
MOE - Answers :E=Sigma/"E"
or Stress/Strain
(psi)
% elongation - Answers :Final Strain * 100%
