Autodesk Inventor Nastran is an integrated FEA solver inside Inventor for rigorous structural, thermal, and dynamic analysis, enabling engineers to validate designs with linear/nonlinear statics, modal and frequency response, buckling, transient dynamics, fatigue, and heat transfer studies. It maintains associativity with Inventor models, supports interoperability with Autodesk CFD for coupled workflows, and uses robust Nastran solvers to handle complex assemblies efficiently.