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Advances in Materials Science and Engineering
Volume 2016, Article ID 1372413, 8 pages
http://dx.doi.org/10.1155/2016/1372413
Research Article

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

1Key Laboratory of Protection and Retrofitting for Civil Building and Construction of Tianjin, Tianjin Chengjian University, Tianjin 300384, China
2School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
3Department of Mechanics, Tianjin University, Tianjin 300072, China

Received 4 January 2016; Revised 18 May 2016; Accepted 29 May 2016

Academic Editor: Luciano Lamberti

Copyright © 2016 Wei Shang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.