Camfit: a virtual fields method based software

The virtual fields method is a tool dedica ted to the identification of the mechanical properties of materials from fullfield deformation measurements. It is now validated in elasticity and plasticity but one of the remaining problems is the fact that researchers wanting to use the method must invest significant time in order to programme the routines. To help them, a software called CamFit has been developed. The purpose of this paper is to present this software. It is based on MATLAB® and uses a graphical pre-processing interface to produce the geometry, the conditions on the virtual fields, to choose the type of behaviour etc... Then, series of displacement maps are uploaded and the identification is launched. Since no iterative solution of the direct problem is required, computation times are very small compared to updating techniques. An important step in the procedure is the smoothing of the displacement measurements to produce strains. FE based approximations are presently available in the software. The final purpose is to introduce the software onto the market. This will be done in the very near future.

[1]  Michael R Wisnom,et al.  Identification of the local stiffness reduction of a damaged composite plate using the virtual fields method , 2007 .

[2]  Michael A. Sutton,et al.  Identification of elasto-visco-plastic parameters and characterization of Lüders behavior using digital image correlation and the virtual fields method , 2008 .

[3]  Fabrice Pierron,et al.  Stiffness and Damping Identification from Full Field Measurements on Vibrating Plates , 2006 .

[4]  Raphaël Moulart,et al.  Identification of the through-thickness rigidities of a thick laminated composite tube , 2006 .

[5]  Stéphane Avril,et al.  Identification of Heterogeneous Constitutive Parameters in a Welded Specimen: Uniform Stress and Virtual Fields Methods for Material Property Estimation , 2008 .

[6]  Stéphane Avril,et al.  General framework for the identification of constitutive parameters from full-field measurements in linear elasticity , 2007 .

[7]  Stéphane Avril,et al.  Identification of Elasto-Plastic Constitutive Parameters from Statically Undetermined Tests Using the Virtual Fields Method , 2006 .

[8]  Stéphane Avril,et al.  The Virtual Fields Method for Extracting Constitutive Parameters From Full‐Field Measurements: a Review , 2006 .

[9]  Stéphane Avril,et al.  Experimental identification of a nonlinear model for composites using the grid technique coupled to the virtual fields method , 2006 .

[10]  Stéphane Avril,et al.  Sensitivity of the virtual fields method to noisy data , 2004 .

[11]  Michel Grédiac,et al.  Principe des travaux virtuels et identification , 1989 .