Impact damage detection in composite plates using deflectometry and the Virtual Fields Method

This paper presents a new method for detecting damage in layered composite materials using a simple measurement technique, deflectometry. The aim is to locate the damage in a specimen and provide a “signature” from the measured surface slopes. Firstly, this method is applied to plate specimens using numerical and experimental data. Secondly, damage indicator based on a new application of the virtual fields method to compute local apparent gaps in equilibrium is presented and used to process the measurements on plates. It is shown that the damage indicator is very sensitive, allowing detection of damage that is difficult to identify directly from the strain maps.

[1]  A. J. Moffat,et al.  Micromechanisms of damage in 0° splits in a [90/0]s composite material using synchrotron radiation computed tomography , 2008 .

[2]  Baoqiao Guo,et al.  An alternative to modal analysis for material stiffness and damping identification from vibrating plates , 2010 .

[3]  John Morton,et al.  Detection of impact damage in CFRP laminates , 1985 .

[4]  H. Kaczmarek,et al.  Comparative ultrasonic analysis of damage in CFRP under static indentation and low-velocity impact , 1994 .

[5]  Naoyuki Watanabe,et al.  X-ray radiography and micro-computed tomography examination of damage characteristics in stitched composites subjected to impact loading , 2011 .

[6]  A. Todoroki,et al.  Image analysis of delamination cracks in carbon-fibre composites by scanning acoustic microscopy , 1994 .

[7]  A. J. Moffat,et al.  In situ synchrotron computed laminography of damage in carbon fibre-epoxy [90/0](s) laminates , 2010 .

[8]  Pierre Ladevèze,et al.  Error Estimate Procedure in the Finite Element Method and Applications , 1983 .

[9]  M. Bonnet,et al.  Overview of Identification Methods of Mechanical Parameters Based on Full-field Measurements , 2008 .

[10]  Ian Sinclair,et al.  In situ fibre fracture measurement in carbon-epoxy laminates using high resolution computed tomography , 2011 .

[11]  C. Garnier,et al.  The detection of aeronautical defects in situ on composite structures using Non Destructive Testing , 2011 .

[12]  M. Grédiac,et al.  On the direct determination of invariant parameters governing anisotropic plate bending problems , 1996 .

[13]  Francesco Aymerich,et al.  Assessment of NDT interferometric techniques for impact damage detection in composite laminates , 2006 .

[14]  Michel Grédiac,et al.  Phase-stepped deflectometry applied to shape measurement of bent plates , 1999 .

[15]  Stéphane Avril,et al.  Characterization of composite plates using the virtual fields method with optimized loading conditions , 2008 .

[16]  E. Patterson,et al.  Damage assessment of fibre reinforced composites using shape descriptors , 2012 .

[17]  Jean-Marie Becker,et al.  Specific design requirements for a reliable slope and curvature measurement standard , 2009 .

[18]  Martyn J Pavier,et al.  Experimental techniques for the investigation of the effects of impact damage on carbon-fibre composites , 1995 .

[19]  R. Olsson,et al.  Nonlinear compressive stiffness in impacted composite laminates determined by an inverse method , 2009 .

[20]  Christophe Bouvet,et al.  Low velocity impact modelling in laminate composite panels with discrete interface elements , 2009 .

[21]  Fabrice Pierron,et al.  The virtual fields method with piecewise virtual fields , 2006 .

[22]  Valentina Lopresto,et al.  Influence of material thickness on the response of carbon-fabric/epoxy panels to low velocity impact , 1999 .

[23]  Robin Olsson,et al.  Experiments and analysis of laminates with artificial damage , 2003 .

[24]  Robin Olsson,et al.  Analytical model for delamination growth during small mass impact on plates , 2010 .

[25]  L. W. Kessler.  Review of progress and application in acoustis microscopy. , 1974, The Journal of the Acoustical Society of America.

[26]  Michael I Friswell,et al.  Damage identification using inverse methods , 2007, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

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

[28]  Eric I. Madaras,et al.  Damage Detection in Rotorcraft Composite Structures Using Thermography and Laser-Based Ultrasound , 2004 .

[29]  C. Devivier.  DAMAGE IDENTIFICATION IN LAYERED COMPOSITE PLATES USING KINEMATIC FULL-FIELD MEASUREMENTS , 2012 .

[30]  Robin Olsson,et al.  Tensile stiffness distribution in impacted composite laminates determined by an inverse method , 2008 .

[31]  J. Gryzagoridis,et al.  Impact damage detection on composites using optical NDT techniques , 2010 .

[32]  Joseph Morlier,et al.  Damage localization using experimental modal parameters and topology optimization , 2010 .

[33]  M. Wisnom,et al.  Damage detection in composite materials using deflectometry, a full-field slope measurement technique , 2012 .

[34]  W. Winfree,et al.  Thermography Inspection for Detection and Tracking of Composite Cylinder Damage during Load Testing , 2011 .

[35]  Michel Grédiac,et al.  The Virtual Fields Method: Extracting Constitutive Mechanical Parameters from Full-field Deformation Measurements , 2012 .

[36]  Charles R. Farrar,et al.  A summary review of vibration-based damage identification methods , 1998 .

[37]  Stéphane Roux,et al.  A finite element formulation to identify damage fields: the equilibrium gap method , 2004 .

[38]  C. M. Mota Soares,et al.  Damage localization in laminated composite plates using mode shapes measured by pulsed TV holography , 2006 .

[39]  Stéphane Roux,et al.  Identification of damage fields using kinematic measurements , 2002 .

[40]  M. Kortschot,et al.  Characterization of composite mesostructures and damage by de-ply radiography , 1995 .

[41]  Long Yu,et al.  Early Damage Detection in Composite Wingbox Structures using Hilbert-Huang Transform and Genetic Algorithm , 2007 .

[42]  O. S. Salawu.  Detection of structural damage through changes in frequency: a review , 1997 .

[43]  Pedro P. Camanho,et al.  Effects of ply clustering in laminated composite plates under low-velocity impact loading , 2011 .

[44]  Stéphane Roux,et al.  Identification of a Damage Law by Using Full-field Displacement Measurements , 2005, physics/0511121.

[45]  Michael R Wisnom,et al.  Local stiffness reduction in impacted composite plates from full-field measurements , 2009 .

[46]  G. Clark,et al.  Use of time-of-flight C-scanning for assessment of impact damage in composites , 1988 .