ABSTRACT
This chapter deals with the numerical computation of the interaction parameter Gsc. The knowledge of the ply thresholds allows the derivation of all ply regression equations from the experimental measurement of just one line, usually the rupture line. The ply regression equations capture all variables related to their load-dependent long-term failures. The scarcity of such equations is a serious impediment to the practical use of the unified equation. The resin-dominance removes the time variable from the unified equation, making the stiffness, weep, and infiltration failures fully cycle-dependent. The reader will understand that the Goodman diagrams coincide with the unified equation only in the solutions of time-independent cases involving infiltration, weep, and stiffness failures. The development of a confidence interval for the long-term safety factor safety factors has tremendous practical implications. The confidence interval establishes the range of the long-term safety factor independent of the interaction parameter Gsc.
