A finite element formulation to identify damage fields: the equilibrium gap method

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Voxel-Scale Digital Volume Correlation (2011, methodology): “The second one [41] resorted to the equilibrium gap method [42].”
An extended and integrated digital image correlation technique applied to the analysis of fractured samples (2009, background): “For identification purposes, the minimization of the mechanical energy is more conveniently written as the norm of the internal forces in the spirit of the Equilibrium Gap Method (Claire et al., 2004).”
Comparison of Local and Global Approaches to Digital Image Correlation (2012, methodology): “The straight line shows an interpolation by the inverse of the ZOI size identify damage parameters by using a biaxial test on a vinylester matrix reinforced by a mat of E-glass fibers [42, 43].”
Digital Image Correlation: from Displacement Measurement to Identification of Elastic Properties – a Review (2006, methodology): “An alternative method solely based on displacement field data can also be used [22, 57] to identify elastic property fields and damage fields through the elasticity/damage state coupling.”