Dear Justin Mathew,

Some preliminary remarks:

1. Would it be possible to define the dimensions of a representive specimen of such a tube? Having such a specimen then it might be possible to subject this specimen to a tensile test. The elastic part of the stress/strain curves yields an experimental value of Young's modulus.

2. An alternative route would be to subject such a representive test tube to a three-point-bending test.

3. I would suggest to apply internationally accepted standard units although in this particular field Anglo-Saxon units may be part or daily practice.

Hi P. Van Mourik,

Dear Justin Mathew,

A starting point for a more analytical approach may be found in Section 4.6 p. 126 of Materials Science in Design and Engineering (see attached link). However it should be noted that the quantitave result yielded by such an analytical approach requires an experimental confirmation.

This experimental confirmation could also be obtained by the measurement of a property that depends on the average value of Young's modulus, e.g. the velocity of sound in a medium depending on Young's modulus of that medium.

http://www.delftacademicpress.nl/m017.php

Dear Justin Mathew,

I was wondering whether or not information is available about the failure mechanism of your MicroCatheterTubes under study. 'A chain is as strong as its weakest link'. In case the weakest link is the connectivity between two components of the composite of which the tube is made, is then an effective value of Young's modulus given by the elastic part of the deformation allowed for by that connectivity?

Hi P. Van Mourik,

The above statement made is very true.

In the plan of analysis, we will consider the tube as Isotropic.

The effective value of Young's modulus is considered for finding the failure mode analyticaly. 

Dear Sirs:

I had an occasion to examine the stresses of single crystal Zinc about a carbon nanotube "CNT" theoretically. The crystal is anisotropic with respect to many properties, the CNT is not really a "tube" but a "fiber".  To my surprise a Google search of "anisotropic" and "composite" because the system was designed of two materials yielded:

stresses in an anisotropic tube p37  Sec 2.3 (?)

a true tube by the way.

Key Engineering Materials Vol. 137 1998

Polymer Blends and Polymer Composites Ed. L. Ye and Y.M Mai

Trans Tech Publication Switzerland, Germany, UK, USA

Proceedings of the International Workshop on Polymer Blends and Polymer Composites 8th - 11th July, Sydney Australia.

Its available thru Amazon, as I am not an author, I feel uneasy providing a link on an older material not covered by Creative Commons.  The copyright is 1998.

The composite was the outer diameter

The ceramic was the inner diameter.

forgive me not noting the scale of the tube. I tried working with the equation because it was the only anisotropic case I found. My values made no sense and were I to actually have worked with the materials , as I should have;  I would have found myself fighting tribological properties of CNTs.