# Strength In Single Crystals

1. Apr 2, 2014

### edcurrymuncher

"An aluminium single crystal alloy aircraft component is oriented such that a tensile stress is applied along a [102] direction. If slip in this material occurs on a (111) plane
and in a [101] direction, compute the yield stress at which the crystal yields if its critical resolved shear stress is 3.42MPa."

Thanks :)

2. Apr 4, 2014

### jk60422

Suggest you do your own Schmid's law homework.

PS the [101] direction isn't a valid direction in the (111) plane.

3. Apr 5, 2014

Something helpful (which I learned from my professors) is to draw the cubic cell with the indicated plane and directions. This will help you get a feel of what $\phi$ and $\lambda$ look like. In addition to load and slip directions, you will also need to determine the direction perpendicular to the slip plane.
The key, however, is to use the dot product to find cos$\phi$ and cos$\lambda$. In order to do this you will need to treat the three key directions as vectors.