Observation of the Microstructural Evolution in a Structural Polymeric Foam Using Incremental Digital Volume Correlation

Polymeric structural foams are widely used in many engineering applications due to their exceptional properties including high specific strength and energy absorption. The mechanical properties depend strongly on their microstructures, which also dictate their load-bearing capability under deformation. However, the mechanical behavior of polymer foams in compression is not well understood, due to the complex local deformation and strain characteristics associated with the cellular microstructure. In this paper, unconfined uniaxial compression of a polymeric structural foam was conducted while its microstructure was determined using micro-computed tomography (micro-CT) subjected to large deformations. The detailed local deformations and strains are obtained by using three dimensional digital volume correlations (DVC) method. This incremental DVC allows the use of intermediate bridging images to determine large nonlinear deformations in the foam under compression. The evolution and deformation mechanism of the microstructure are observed during different compression stages using the incremental DVC techniques.

[1]  B. Bay,et al.  Digital volume correlation: Three-dimensional strain mapping using X-ray tomography , 1999 .

[2]  D. Zenkert,et al.  Fatigue of Closed Cell Foams , 2006 .

[3]  Christian Franck,et al.  Quantifying cellular traction forces in three dimensions , 2009, Proceedings of the National Academy of Sciences.

[4]  P. Wyss,et al.  3D micro-scale deformations of wood in bending: synchrotron radiation muCT data analyzed with digital volume correlation. , 2008, Journal of structural biology.

[5]  Stéphane Roux,et al.  Three dimensional experimental and numerical multiscale analysis of a fatigue crack , 2010 .

[6]  Fredrik Forsberg,et al.  3D deformation and strain analysis in compacted sugar using x-ray microtomography and digital volume correlation , 2009 .

[7]  Jason J. Williams,et al.  Three-dimensional (3D) visualization of reflow porosity and modeling of deformation in Pb-free solder joints , 2010 .

[8]  H. Sehitoglu,et al.  Investigation of fatigue crack closure using multiscale image correlation experiments , 2009 .

[9]  Stéphane Roux,et al.  Three dimensional image correlation from X-Ray computed tomography of solid foam , 2008 .

[10]  Magnus Burman,et al.  Tension, compression and shear fatigue of a closed cell polymer foam , 2009 .

[11]  N. Petrinic,et al.  Compressive deformation of Rohacell foams: Effects of strain rate and temperature , 2013 .

[12]  N. Petrinic,et al.  The mechanical response of Rohacell foams at different length scales , 2011 .

[13]  Pascal Doumalin,et al.  Comparison between X-ray micro-computed tomography and optical scanning tomography for full 3D strain measurement by digital volume correlation , 2008 .

[14]  Jay C. Hanan,et al.  Tomography and Simulation of Microstructure Evolution of a Closed-Cell Polymer Foam in Compression , 2008 .

[15]  R. S. Birch,et al.  The crush behaviour of Rohacell-51WF structural foam , 2000 .

[16]  E. Morgan,et al.  Accuracy and precision of digital volume correlation in quantifying displacements and strains in trabecular bone. , 2007, Journal of biomechanics.

[17]  Henry Proudhon,et al.  Three-dimensional visualisation of fatigue cracks in metals using high resolution synchrotron X-ray micro-tomography , 2006 .

[18]  I. Jandejsek,et al.  Evaluation of strain field in microstructures using micro-CT and digital volume correlation , 2011 .

[19]  Q.M. Li,et al.  Degradation of Elastic Modulus of Progressively Crushable Foams in Uniaxial Compression , 2008 .

[20]  B. Bay,et al.  Comparison of the linear finite element prediction of deformation and strain of human cancellous bone to 3D digital volume correlation measurements. , 2006, Journal of biomechanical engineering.

[21]  Andrea Giachetti,et al.  Matching techniques to compute image motion , 2000, Image Vis. Comput..

[22]  Laurent Babout,et al.  Damage assessment in metallic structural materials using high resolution synchrotron X-ray tomography , 2003 .

[23]  G. Ravichandran,et al.  Three-dimensional Full-field Measurements of Large Deformations in Soft Materials Using Confocal Microscopy and Digital Volume Correlation , 2007 .