Assume the volume fraction 0.4 of particles all with a radius 3mm, the grain boundary energy is given as 6kJ/mm. Calculate the restraining force per unit area of boundary? (Approximately)

Assume the volume fraction 0.4 of particles all with a radius 3mm, the

1.	Assume the volume fraction 0.4 of particles all with a radius 3mm, the grain boundary energy is given as 6kJ/mm. Calculate the restraining force per unit area of boundary? (Approximately)
A.	1.2
B.	1.8
C.	2.4
D.	3.6
Answer» B. 1.8

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Assume the volume fraction 0.4 of particles all with a radius 3mm, the grain boundary energy is given as 6kJ/mm. Calculate the restraining force per unit area of boundary? (Approximately)

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