To calculate the force required to deflect a sheet metal part, the discussion emphasizes using beam bending calculations if the U portion is constrained and bending occurs between specified points. A formula for deflection involving load per unit area and material properties is mentioned, but the user reports unsatisfactory results. Clarification on the assumptions regarding the part's constraints is necessary for accurate calculations. Alternative formulas for deflection of a fixed flat membrane are sought, indicating a need for further exploration of applicable methods. Accurate force calculations depend on precise understanding of the part's configuration and constraints.