Class 3 Materials selection

Question 1

when selecting materials what are the 4 steps in the strategy and what do they each mean

Answer 1

Translation -Define component function(s), constraints, objectives, free variables

Screening - Eliminate materials that do not meet the constraints

Rank -Order materials by ‘performance’ (material indices)

Documentation - Investigate the shortlisted candidates further and make a final selection

Question 2

what is the bending stiffness equation

Answer 2

Bending stiffness (S) ∝ YM(E) *2nd moment of area(I)

Question 3

what is the bending stiffness factor - 2 eq

Answer 3

12*2nd Moment of area/Area^2
Or
Bending stiffness/reference stiffness

Question 4

what does stress σ =

Answer 4

σ = Bending moment/Section modulus

Question 5

what is the bending strength factor (2)

Answer 5

section modulus/reference section modulus
or
6*section Modulus/Area^(3/2)