stress and strain

Question 1

whats the difference between sheer stress and normal stress

Answer 1

normal - force is perpendicular to the area
sheer - force is parallel to the are

Question 2

overtime what happens to a fluid under a constant sheer stress

Answer 2

it continues to deform more unlike in a solid

Question 3

is the rate of shear strain and shear stress proptional or not?

Answer 3

yes theyre proportional

Question 4

what is specific density

Answer 4

density of the fluid / density of water

Question 5

what is specific weight?

Answer 5

density*gravity

Question 6

what is the viscocity coefficient

Answer 6

measure of a fluids resistance to flow

Question 7

what is a newtonian fluid?

Answer 7

a fluid which follows newton’s law of viscosity
(tau =mu*du/dy), where (tau) is shear stress, (mu) is viscosity, and (du/dy) is velocity gradient

Question 8

what is plastic deformation

Answer 8

an object is permanently deformed, stress and strain aren’t proportional