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Bog'liq
Edward Le PhD Dissertation

Aspect Ratio(l/t)
MO
E
(MP
a
)
D
t
=10
D
t
=100
D
t
=500
D
t
=1000


117 
increased. Furthermore, there is a higher percentage of increase in MOE by numerical 
than the combine HROM and shear-lag model (103% increased for numerical calculation 
and 22% increased for shear-lag calculation).
Similarly, Figure 5.10 is re-plot the results of Figure 5.2 of the effect of MOE for 
different values of AR along with results of equation 5.5 combined with homogenized 
model for 1/D
t
=0. The numerical results are still lower than the analytical results of 
combined HROM with equation 5.5. However, as AR increased, MOE approached 
analytical results.
Figure 5.9. Simulated MOE and results of shear-lag Equation 5.5 for 1/D
t
=0.05.
100
1100
2100
3100
4100
70
90
110
130
150
170
190
Aspect Ratio(l/t)
MO
E
(MP
a
)
Model, Gap=15mm
Model, Gap=30mm
Simulation, Gap=30mm
Simulation, Gap=15


118 
Figure 5.10. Simulated MOE and results of shear-leg Equation 5.2 for 1/D
t
=0.
5.4 Summary and Conclusions 
We can conclude that, increases in strand length or decreases in gap spacings in 
surface layers increases MOE. Strand length has a large impact on the mechanical 
properties of wood-based composites when it reach optimum level at around AR = 200. 
One way to increase load carrying capacity in wood composites panel is to increase 
interfacial stiffness but this is often more difficult and costly. This is because to increase 
interfacial stiffness more resin can be used but this will result in higher cost for more 
resin consumption. Therefore, an increase in fiber aspect ratio (strand length) may be an 
easier route. As an added benefit, the role of resin should decrease as the strand length 
increases.
Shear-lag model can incorporate interfacial stiffness into the shear-lag parameter 
that thereby predict modulus as a function of the phase’s properties, phase geometry 
(aspect ratio) and interfacial stiffness. From the shear-lag model, the effect of strand 
100
1100
2100
3100
4100
70
90
110
130
150
170
190

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