If you remember Poisson’s ratio ν, you would recall that the stress in one direction affects the strain in another direction.

What if we had stresses in multiple directions (e.g. σ_{x} and σ_{y}) simultaneously? How do we calculate the net strain?

If you remember Poisson’s ratio ν, you would recall that the stress in one direction affects the strain in another direction.

What if we had stresses in multiple directions (e.g. σ_{x} and σ_{y}) simultaneously? How do we calculate the net strain?

Fortunately we have our *generalised Hooke’s law* to give us our generalised strain-stress relationships:

Shear strains are not affected by Poisson’s ratio and therefore has the following relations:

Let’s look at an example now.

Fortunately we have our *generalised Hooke’s law* to give us our generalised strain-stress relationships:

Shear strains are not affected by Poisson’s ratio and therefore has the following relations:

Let’s look at an example now.