A continuous and aligned fibre-reinforced composite is to be produced consisting of 45% vol aramid fibres and 55% vol polycarbonate. What would the stiffness be in GPa (2 d.p.), if the same volume of fibres were used, however they were in the form of a chopped strand mat?
The mechanical properties of the two materials are given as follows:
Aramid fibre: E (GPa) 131 UTS (MPa) 3600
Polycarbonate: E (GPa)2.4 UTS (MPa)80
I went a head and did the question, with the formula:
Ec(longitudinal) = (K x Ef x Vf) + (Em x Vm)
And subing for:
Ec(longitudinal) = Unknown
K = 1 (aligned/continuous/parallel in plane)
Em = 2.4 GPa (polycarbonate = matrix phase)
Ef = 131 GPa (aramid fibre = fibre phase)
Vm = 55% = 0.55
Vf = 45% = 0.45
To get an answer of: 60.27 GPa
But then i realised it said "however they were in the form of a chopped strand mat" does that mean the K value is not 1???
If someone could point me in the right direction for this chopped mat that would be great!!!
That looks right to me
That looks right to me
References :
math expert of experts