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Volume fraction of fibres:
The epoxy material is prepared to be stressed to its full strength. What must be volume fraction of fibres?
Solution
Here
σ′ = 1200 MPa, σ ′m= 80 MPa, E f / Em = 24, x = 0.25
∴ 0.25 = 1200 - 80 + V f (1 - 24) 80 /1200 + 80 (1 - 24)
=1120 + (- 1840) V f/- 640
∴ V = 640 × 0.25 - 1120 /- 1840 = 960 /1840 = 0.52
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