Physical Model for Quantitative Organization Design on Mechanical Performance of Nanotwin Unit in Face‐Centered Cubic Metal

Arranging functional units into a specific organization is a practical structural strategy for achieving fabulous performance, known as the functional unit and organization (FUO) paradigm. This paradigm offers a concise shortcut to establishing structure–performance relationships. Inspired by it, here we establish an efficient quantitative model to identify the mechanical performance of different organized nanotwin (NT) units in metals, following three critical steps. First, given the significant nonlinear elastic effect in ductile metals, we develop a bond strain‐based modulus model, which notably improves the precision of preyield response compared with the standard Cauchy–Born rule. Second, to address the inaccuracy of the traditional Schmid law in describing the critical resolved shear stress (CRSS), we systematically investigate the non‐Schmid factors, including normal stress, Escaig stress, and hydrostatic pressure, leading to a more universal yield condition. Third, the yield strengths are analytically solved without any iteration or relaxation, enabling fast structure–performance quantification. Beyond predicting elastic modulus and yield strength, this model also helps identify dominant plastic mechanisms (boundary vs. dislocation, grain growth vs. refinement), especially for textured structures exhibiting spacing‒orientation coupling. Our FUO‐based model provides a pathway to readily obtain mechanical performances of different organized nanotwins by bridging atomic simulations and continuum mechanics.