Experimental and Applied Mechanics, Volume 4: Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics, the fourth volume of seven from the Conference, brings together 54 contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Experimental and Applied Mechanics, including papers on: Fracture & FatigueMicroscale & Microstructural Effects in Fatigue & FractureMaterial ApplicationsComposite Characterization Using Digital Image Correlation TechniquesMulti-Scale Simulation and Testing of CompositesResidual StressInverse Problems/Hybrid MethodsNano-CompositesMicrostructure Material CharacterizationModeling and Uncertainty QuantificationImpact Behavior of Composites