High strain gradient measurements by using digital image correlation technique

When material characterization requires nonhomogeneous strain field measurements, the use of specific techniques is necessary. In this paper, the efficiency of the digital image correlation method for measuring in-plane displacements in the presence of high strain gradient is discussed. Three types of strain gradient have been studied: strain localization around a hole in a composite laminate, strain concentration at a crack tip in a TiAl alloy, and strain gradient on a polymer neck front. These three applications concern various materials, various types of loading, and various gradient values. Results demonstrate the technique capabilities for a wide range of cases.

[1]  Kazuo Arakawa,et al.  Dynamic fracture analysis by moiré interferometry , 1991 .

[2]  J. Kalthoff,et al.  An experimental study of the deformation fields around a propagating crack tip , 1998 .

[3]  Stéphane Roux,et al.  Correlation image velocimetry: a spectral approach. , 2002, Applied optics.

[4]  H J Tiziani,et al.  Speckle interferometry with temporal phase evaluation for measuring large-object deformation. , 1998, Applied optics.

[5]  E. Patterson,et al.  A photoelastic study of an angle crack specimen subject to mixed mode I–III displacements , 1997 .

[6]  M. Sutton,et al.  High-temperature deformation measurements using digital-image correlation , 1996 .

[7]  W. Knauss,et al.  Strain inhomogeneity and discontinuous crack growth in a particulate composite , 1998 .

[8]  J. Brillaud,et al.  Limits and possibilities of laser speckle and white-light image-correlation methods: theory and experiments. , 2002, Applied optics.

[9]  F. Chang,et al.  Modelling of splitting and delamination in notched cross-ply laminates , 2000 .

[10]  J. M. Burch,et al.  Production of Multiple Beam Fringes from Photographic Scatterers , 1968 .

[11]  J. Lambros,et al.  Investigation of crack growth in functionally graded materials using digital image correlation , 2002 .

[12]  J. Bauwens,et al.  The strain-rate and temperature dependence of yield of polycarbonate in tension, tensile creep and impact tests , 1974 .

[13]  P. Theocaris,et al.  Strain-analysis of neck formation and propagation in glassy polymers , 1979 .

[14]  B. Wattrisse,et al.  Analysis of strain localization during tensile tests by digital image correlation , 2001 .

[15]  A Asundi,et al.  Sampled-speckle photography for measurement of deformation. , 2000, Optics letters.

[16]  M. Lafarie-Frenot,et al.  Damage and inelastic deformation mechanisms in notched thermoset and thermoplastic laminates , 1996 .

[17]  H. F. Nied,et al.  Solid Phase Sheet Forming of Thermoplastics—Part II: Large Deformation Post-Yield Behavior of Plastics , 1986 .

[18]  I. Lira,et al.  Electronic speckle pattern interferometry analysis of tensile tests of semihard copper sheets , 2001 .

[19]  Ichirou Yamaguchi,et al.  Speckle Displacement and Decorrelation in the Diffraction and Image Fields for Small Object Deformation , 1981 .

[20]  Pramod Rastogi,et al.  Principles of Holographic Interferometry and Speckle Metrology , 2000 .