materials equations Flashcards
1
Q
stress
A
force/cross sectional area
2
Q
strain
A
change in length/original length
3
Q
youngs modulus
A
stress/strain
4
Q
rigidity
A
EA
5
Q
stiffness
A
rigidity per unit length
k=F/change in length
6
Q
flexibilty
A
f=change in length/F
inverse of stiffness
7
Q
strain rate
A
change in strain/time
coeficient of viscosity (n)=stress/strain rate
8
Q
shear stress
A
shearing force/sheared area
9
Q
shear strain
A
angle sheared =x/d
10
Q
shear strength
A
shear force required to fracture/sheared area
11
Q
modulus of rigidity
A
shear stress/shear strain
12
Q
max shear stress
A
stress/2
13
Q
how are G and E linked
A
E/2 (1+v)
14
Q
variation in stress (bending)
A
stress = eE = y/rE
15
Q
bending moment
A
Mc=Fx
