Assignment#3: Numeric: Investigate elastic anisotropy of a
unidirectional Alumina/PEEK composite.
Assignment #3: (200pnts)
Numeric: Investigate elastic anisotropy of
a unidirectional Alumina/PEEK composite.
Objective: Setup a problem for students to investigate anisotropy of a
unidirectional fiber-reinforced composite made from alumina
fibers and Polyether-ether-ketone (PEEK) polmyer matrix by
using the Interactive Modules embedded in the lecture notes.
Prerequisites for Student: Lectures based on material in section 4.1
Introduction to Mechanical Behavior of Anisotropic Materials. Two unpublished
manuscripts on elastic properties of Alumina/PEEK will be passed out in class.
From lecture notes and two unpublished manuscripts on Alumina/PEEK and access
to interactive computer program modules #
2,
3,
19, and
20,
follow the outline
below:
- From Table 1. in Handout#1, compare composite properties at a given
fiber volume fraction with those calculated in Table 1. Compare the
anisotropy of the Alumina/PEEK with the graphite/epoxy default in
Module#2, for example is there, or is there a trend toward negative
Poisson's ratio. What if any role does the micro- / nano-structure
control the macroscopic anisotropy.
- Take the elastic composite properties and substitute them into Modue#3
and view the elastic anisotropy as eigen-value ("shapes") and eigenvector
("color gradients") mapped onto the wave surface. Again how does Alumina/PEEK
compare with the anisotropy of the graphite/epoxy.
- Also take the same elastic composite properties and substitute them into
Module#19 and
Module#20 and
investigate the effect this anisotropy has on
the dynamic mechanical behavior. Again compare these results with graphite/epoxy.
- Explain in your own words how elastic properties scale from nano to macro
as illustrated in Fig. 23 at the end of section 4.1 on "Geometric
Representations of Elastic Anisotropy: All Tensor Components, Cijkl.
Include results from your Alumina/PEEK in your discussion.
- Include a copy of your results from each the modules that includes the
"unique-directory" name that lists all files. Also include images of your
results as part of your discussion.
Handouts:
- Elastic Constants of a Al2O3-SiOs (fiber)/
PEEK Composite: Measurements, Modeling, and Low Temperatures.
- Performance of Alumina/Epoxy Thermal Isolation Straps.
Contact
Dr Ron Kriz for information in this section.
Created 11/08/00 | Revised 11/08/00
http://www.jwave.vt.edu/~rkriz/crcd/assign/assign3/assign3.html