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impact damage due to laminar construction??

Hi everyone,


According to a book chapter written by NL Hancox, 'Laminar construction of composites which is required if the reinforcing fibres are to be used efficiently and anisotropy reduced, can be a reason why composite laminates are vulnerable to impact damage.'

Now I have three questions;

1-What is meant here by the specified 'laminar construction to reduce anisotropy'?Does it mean to use different orientation for fibres in each ply to have an isotropic material at the laminate level?

2-Why are we interested to make laminates isotropic at all?

3- How can this, make composite laminates more susceptible to failure under impact??


Thanx a lot for your ideas!




I have the asnwer now, I willput it here in case it turns useful for anyone

1&2- Yes, using different fibre orientations in the composite plies will
make it stronger in different directions which is obviously an advantage.

3- Delamination is one of the major failure modes in composites subjected to
impact. If the orientation of fibres are different from each other in two
adjacent plies, the possibility of delamination happening at that interface is
much higher. The underlying reason originates from what happens in the curing
process and that the fibres are not impregnated well into the resin at the
interface of two plies if they have different orientation.


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