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extracting strain on composite model....

extracting strain on composite model....

extracting strain on composite model....

(OP)
Hi all,

For FE comparison to experimental results in terms of strain, i've tried to
extract the strain in FE models using shell element, initilaly. For more testing
information, the specimens were made of carbon fibre composite with 16 plies,
[45/90/-45/0]2s. Additionally, the strain gauges were mounted on the both top
and bottom surfaces in 0degree direction , subjected to impact under pretension.

The problem is to extract the strain in 0 degree on the surface where 45 degree
ply is on. So what im trying is to put a very thin dummy 0 degree ply, having a
very lower stiffness (a thousandth of the original ply property), on the top and
bottom of the original 16 plied shell model to capture the desired strain.
Since i have never done this before, i did a simple shell model where one side
is fully fixed with the load being applied in the other side (please see the
attached inp file). However, it is seen that the
strain from the dummy top and bottom plies varies depending on the thickness. SO im not sure how thin the dummy plies should be.

I believe, this practice will be very helpful for me for the later FE analyses
using 3D models.

Much appreciated any help.

Regards,
Minki

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