Hello, I have a system that consists of a clamped-clamped beam with a residual stress and am trying to find an equation that governs its deflection due to a point force that takes stress into consideration. A formula I have come across: d = (F*L^3)/(192*E*I) does not accurately model the measured displacement of the beam. d : maximum central deflection (m) F : magnitude of applied point force (N) L : length of the beam (m) E : Young's modulus (Pa) I : moment = (w*t^3)/12 (m^4) Is there a formula that includes residual film stress as well? Or is there a good tutorial available for deriving such a formula? As a word of warning, I do not have a strong background in mechanics, so I apologize if I overlooked something simple. Thank you in advance for you help!