This paper represents a contribution to the study of identification procedures resting on kinematic measurements provided by Digital Image Correlation (DIC). Reference is made to non-conventional laboratory tests on adhesively bonded assemblies for aerospace applications, in which the mechanical properties of the adhesive joint are regarded as unknowns to be estimated. Full-field measurements allow one to monitor and model exclusively a small sub-domain (Region-Of-Interest, ROI), by prescribing kinematic conditions along its boundary. As a drawback of this local approach, worsened by the slender geometry and the nonlinear material behavior, noise on data from the outer boundary propagate throughout the sub-domain, influencing the final estimates and generating hardly legible strain and stress fields. As a novelty, here smoothing of boundary data and identification of mechanical parameters, so far performed in a sequence, are tackled simultaneously in a coupled framework. An augmented parameter space is considered for identification, including both the (cohesive) mechanical parameter of the interface and the “actual“ boundary conditions.

SIMULTANEOUS ASSESSMENTOF COHESIVE PARAMETERS AND BOUNDARY CONDITIONS,ON THE BASIS OF KINEMATIC MEASUREMENTSAT THE MICROSCALE

FEDELE, ROBERTO;
2010-01-01

Abstract

This paper represents a contribution to the study of identification procedures resting on kinematic measurements provided by Digital Image Correlation (DIC). Reference is made to non-conventional laboratory tests on adhesively bonded assemblies for aerospace applications, in which the mechanical properties of the adhesive joint are regarded as unknowns to be estimated. Full-field measurements allow one to monitor and model exclusively a small sub-domain (Region-Of-Interest, ROI), by prescribing kinematic conditions along its boundary. As a drawback of this local approach, worsened by the slender geometry and the nonlinear material behavior, noise on data from the outer boundary propagate throughout the sub-domain, influencing the final estimates and generating hardly legible strain and stress fields. As a novelty, here smoothing of boundary data and identification of mechanical parameters, so far performed in a sequence, are tackled simultaneously in a coupled framework. An augmented parameter space is considered for identification, including both the (cohesive) mechanical parameter of the interface and the “actual“ boundary conditions.
Atti Convegno Gruppo Italiano Meccanica Computazionale GIMC 2010
9788890521706
Structural Adhesives;
Digital Image Correlation;
Cohesive crack model;
Parameter Identification.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/580360
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