Effect of Molecular Chain Structure on Fracture Mechanical Properties of Aeronautical Polymethyl Methacrylate Using Extended Digital Image Correlation Method

The main purpose of this work is to investigate the fracture mechanical properties of aeronautical polymethyl methacrylate, which has been treated with directional tensile technology. Because of the special processing of directional polymethyl methacrylate, the molecular chain structures are different in different directions. The mechanical properties depend on the specific molecular chain structures. We use extended digital image correlation to measure the displacement field near the tip of the crack when the cracks grow in different directions in directional polymethyl methacrylate. We then tested the critical load for different specimens and analyzed the fracture morphology of the different specimens. Thanks to the experimental results, a molecular chain model of directional polymethyl methacrylate could be established. The analysis results using the molecular chain model are consistent with the experiments, which confirms the reliability of the molecular chain model.

[1]  Zhuang He,et al.  On the evaluation of stress intensity factor from displacement field affected by 3D corner singularity , 2016 .

[2]  M. Ayatollahi,et al.  Theoretical and experimental investigation of brittle fracture in V-notched PMMA specimens under compressive loading , 2015 .

[3]  J. P. Berry.  Fracture processes in polymeric materials. I. The surface energy of poly(methyl methacrylate) , 1961 .

[4]  H. Kim,et al.  Temperature and frequency effects on fatigue crack growth of uPVC , 1994, Journal of Materials Science.

[5]  B. Castagnède,et al.  Measurement of the dynamic fracture toughness with notched PMMA specimen under impact loading , 2009 .

[6]  Jinlong Chen,et al.  Improved extended digital image correlation for crack tip deformation measurement , 2015 .

[7]  L. Pook.  A 50‐year retrospective review of three‐dimensional effects at cracks and sharp notches , 2013 .

[8]  C. Chow,et al.  Fatigue crack propagation in aluminium and PMMA , 1984 .

[9]  L. Nunes,et al.  Experimental investigation of mixed-mode-I/II fracture in polymer mortars using digital image correlation method , 2014 .

[10]  Filippo Berto,et al.  Fracture behaviour of notched round bars made of PMMA subjected to torsion at room temperature , 2012 .

[11]  Ted Belytschko,et al.  A finite element method for crack growth without remeshing , 1999 .

[12]  Xiaochuan Zhang,et al.  Gray change detection method for damage monitoring in materials. , 2015, Applied optics.

[13]  B. Mukherjee,et al.  Fatigue-crack growth in polymethylmethacrylate , 1971 .

[14]  F. Ramsteiner,et al.  Fatigue crack growth in polymers , 2001 .

[15]  Zhuang He,et al.  Application of digital image correlation technique for investigation of the displacement and strain fields within a sharp notch , 2015 .

[16]  Filippo Berto,et al.  Fracture behaviour of notched round bars made of PMMA subjected to torsion at −60 °C , 2013 .

[17]  Bing Pan,et al.  Accurate ex situ deformation measurement using an ultra-stable two-dimensional digital image correlation system. , 2014, Applied optics.

[18]  S. Roux,et al.  “Finite-Element” Displacement Fields Analysis from Digital Images: Application to Portevin–Le Châtelier Bands , 2006 .

[19]  R. Zhang,et al.  Mixed mode fracture study of PMMA using digital gradient sensing method , 2014 .

[20]  R. Hertzberg,et al.  Mechanical behaviour of poly(methyl methacrylate) , 1990 .

[21]  W. Peters,et al.  Digital Imaging Techniques In Experimental Stress Analysis , 1982 .

[22]  Kazuo Arakawa,et al.  Experimental studies on dynamic fracture behavior of thin plates with parallel single edge cracks , 2002 .

[23]  W. Shang,et al.  Study of anisotropic mechanical properties for aeronautical PMMA , 2014 .

[24]  Stéphane Roux,et al.  Extended digital image correlation with crack shape optimization , 2008 .

[25]  Y. Mai,et al.  Effect of temperature on fatigue crack growth in unplasticized polyvinyl chloride , 1993, Journal of Materials Science.

[26]  X. Yao,et al.  Fracture characterizations of V-notch tip in PMMA polymer material , 2004 .

[27]  S. Roux,et al.  Digital Image Mechanical Identification (DIMI) , 2007, 0712.3918.

[28]  Kazuo Arakawa,et al.  Experimental study of dynamic fracture behavior of PMMA with overlapping offset-parallel cracks , 2003 .