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 & Fatigue • Microscale & Microstructural Effects in Fatigue & Fracture • Material Applications • Composite Characterization Using Digital Image Correlation Techniques • Multi-Scale Simulation and Testing of Composites • Residual Stress • Inverse Problems/Hybrid Methods • Nano-Composites • Microstructure Material Characterization • Modeling and Uncertainty Quantification • Impact Behavior of Composites