In essence, strain transformation is pretty much the same as stress transformation; except that σ_{x} and σ_{y} are swapped with ε_{x} and ε_{y}.
**However τ _{xy} is actually converted to γ_{xy}/2 instead* (you can check any textbooks for the derivation to see why).

Again, the equations are presented for completeness sake and it’s still recommended for you to use the Mohr’s circle instead, which we will cover in Chapter 8.2.

In essence, strain transformation is pretty much the same as stress transformation; except that σ_{x} and σ_{y} are swapped with ε_{x} and ε_{y}.
*However τ_{xy} is actually converted to γ_{xy}/2 instead (you can check any textbooks for the derivation to see why).

Again, the equations are presented for completeness sake and it’s still recommended for you to use the Mohr’s circle instead, which we will cover in Chapter 8.2.

And here are the formulas for principal strains ε_{1}, ε_{2} and the maximum in-plane shear strain γ_{max in-plane}:

**Always, always* remember *to multiply γ _{x'y'}/2 by 2* after conversion to get the final γ

Let’s look at an example now.

And here are the formulas for principal strains ε_{1}, ε_{2} and the maximum in-plane shear strain γ_{max in-plane}:

**Always, always* remember *to multiply γ _{x'y'}/2 by 2* after conversion to get the final γ

Let’s look at an example now.