1.
b. Impact testing was used to assess which property of the materials? For metals, what crystal
structure was more susceptible to the ductile-to-brittle transition temperature? Why was this the
case?
Solution
Answer:-
The Imapct testing was used to to asses the required energy to fracture the material and it can be
measure the toughness of the material. we can also known the yield strength of material by using
impact testing but we dont have any analytical formual for. we can also calcualte the strain rate
for its effect on fracture of material.
There is BCC and FCC type of crystal which is more susceptible to the ductile to brittle
transiotion temperature.
the low carbon steel BCC metals, which become brittle at low temperature or at very high strain
rate.
incase of FCC metals its remain ductiule at low temperature.
In metals there is plastic deformation at room temperature occurs due to dislocation motion. this
dislocation motion required a stress to move and its depend on the atomic bonding which is a
crustal structure.
In this case brittle fracture occurs at low temperature and ductile fracture occurs at high
temperature. ductile-brittle transformation occured in between low and high temperature.