Properties of hemp fibre polymer composites -An optimisation of ...

The relationship for composite tensile strength can be determined by substituting Ef with
σf and substituting Em with σm(εu).
( 1−W
f ) σm( εu)
( 1 Vp
)
σ ⎛W cu fσfu = ⎜ +
ρ ⎜ c ρ
⎝ f
c
ρm
⎞
⎟
⎠
−
nσ
( 1− Wf ) σm( εu) Wfρm + ( 1−Wf
) ρ f
W ( 1 ) ( 1 W ) ( 1 )
σ ⎛W cu fσfu = ⎜ +
ρ ⎜ c ρ
⎝ f
c
ρm ⎞⎛
⎟⎜
⎟⎜
⎠⎝ fρm + α f + − f ρ f + αm
⎞
⎟
⎠
( 1−Wf
) σm( εu) Wf
( ρm − ρ f ) + ρ f
W ( 1 ) ( 1 W ) ( 1 )
σ ⎛W cu fσ ⎞ ⎛
⎞
fu
= ⎜ + ⎟× ⎜
⎟
ρ ⎜ c ρ f ρ ⎟ ⎜
⎝ m ⎠ ⎝ fρm + α f + − f ρ f + α ⎟
m ⎠
78 Risø-PhD-11
nσ
nσ