MECH 4310 Analysis of Composite and Multifunctional Materials
HOMEWORK #5
Due Thursday April 2nd at 10:00
1. For the lay-ups in homework 4, determine the positive stress resultant Nx and the moment resultant Mx
that would cause the first ply to fail for the max stress, Tsai-Hill and Tsai-Wu failure criteria. Plot the
stress distributions in terms of the material and global coordinates for the case of Tsai-Wu. Use the
material limit data for graphite epoxy provided in the text (already included in the excel spreadsheet on
the website).
2. Determine stress resultant Nx and the moment resultant Mx for the three failure criteria if they are
negative and compare the results to problem 1.
3. Determine the positive stress resultant Nx and the moment resultant Mx versus ply failure by removing
ply contributions to the ABD matrix as they fail. Plot the corresponding resultant versus strain, x or x,
respectively.