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Ultrasonic guided wave nondestructive evaluation (NDE) techniques are being used to detect flaws and damage in fracture critical structures such as composites. In order to provide early detection of aging and damage processes in composites, we propose to develop a "virtual inspection" simulation toolbox specifically for ultrasonic guided waves. This toolbox will be able to evaluate ultrasonic guided wave NDE methods for its feasibility as part of the design process for critical system components, and it would include modeling the changes in critical material properties as indicators of material aging and then quantifying the levels of detectability of these material properties with the guided wave NDE technique. This computational tool will be able to accurately model the interaction between the changes in the material properties and the probing energy of guided waves to allow the development of the inspection parameters needed for application on a particular structure.