ABSTRACT
Plane-strain physical modelling tests can provide large quantities of often unused data in the form of Particle Image Velocimetry derived displacement fields. Using an Identification Method, it is possible to use this fullfield displacement data, along with external force data, such that a stress-strain response can be reconstructed using optimisation by minimising the energy gap between internal and external work. Previous work indicates that the method is viable with perfect artificial data, but noise, discretisation, and other issues, can cause a reduction in accuracy of the recovered curve. This contribution demonstrates the applicability of this method to soils with non-linear stress-strain responses undergoing non-uniform deformation. Finite element modelling was used to obtain “perfect” strain fields which were artificially degraded to simulate noisy experimentally obtained data, with higher levels of noise increasingly reducing the quality of the recovered stress-strain curve, particularly for higher strain values in which less data points are available.
