Final answer:
To calculate radial stress at a specific point in a curved beam, a general formula is applied, but specific problem details are required for an exact solution.
Step-by-step explanation:
The question asks to determine the radial stress at the junction of the web and inner flange of the curved beam portion of a clamp, while neglecting stress concentrations. Based on the examples provided, which involve calculations of stress and strain under various scenarios, it's clear that this is an engineering problem focused on materials strength and mechanics of materials. However, without the specifics of problem 9.20, it's not possible to give a direct answer. To solve such a problem in general, the radial stress in a curved beam can be calculated using the formula σr = σz (r/roi), where σz is the axial stress, r is the radial distance to the point of interest, and roi is the inner radius of the curved beam.