1. A method for analyzing a bondline in a structure, the method is implemented by at least one computing device, the method comprising: obtaining, from a first side of the structure, by the at least one computing device, at least one first internal image of the structure that includes at least a first pattern associated with the bondline and disposed internally within the structure, wherein the structure is in a pre-loaded state; obtaining, from the first side of the structure, by the at least one computing device, at least one second internal image of the structure that includes at least the first pattern, wherein the structure is in a loaded state, wherein the first internal image and the second internal image are actual images of the structure in the pre-loaded state and the loaded state, respectively; comparing, by the at least one computing device, the at least one first internal image with the at least one second internal image; determining, by the at least one computing device, at least one stress-related property or at least one strain-related property of the bondline based on the comparison; and predicting an estimated life of the bondline, whereby the estimated life provides a valuable tool for optimization of maintenance effort.