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The experimental value of iron for the Peierls stress is 112.5 MPa
The stress at the graph maximum (Peierls stress) is 51 MPa
The stress using \({\tau _P} = 2\pi \frac{{\Delta {U}}}{{{b^2}}}\) is 54 MPa
According to the Peierls Nabarro model, the maximum stress is \( {\tau _P} = \;3G ( - 2\pi \frac{w}{b}) \) = 5 GPa
Or in the simplified version, assuming w=b, the maximum stress is G/180 = 361 MPa