The image above represents performance index.

To compute for performance index, two essential parameters are needed and these parameters are **Shear Stress at Fracture (τ _{f})** and

**Density (ρ).**

The formula for calculating the performance index:

P = ^{τf}^{2/3} / _{ρ}

Where:

P = Performance Index

τ_{f} = Shear Stress at Fracture

ρ = Density

Let’s solve an example;/

Find the performance index when the shear stress at fracture is 32 and the density is 10.

This implies that;

τ_{f} = Shear Stress at Fracture = 32

ρ = Density = 10

P = ^{τf}^{2/3} / _{ρ}

P = ^{32}^{2/3}/_{10}

P = ^{10.079 }/ _{10
}P = 1.0079

Therefore, the **performance index **is **1.0079.**

Continue reading How to Calculate and Solve for Performance Index | Material Selection