Optical experiment testing for fracture toughness of directional plexiglass along different directions

Xinhua Ji; Wei Shang; Xiaochuan Zhang; Jinlong Chen

doi:10.1117/12.839066

24 August 2009 Optical experiment testing for fracture toughness of directional plexiglass along different directions

Xinhua Ji, Wei Shang, Xiaochuan Zhang, Jinlong Chen

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73751M (2009) https://doi.org/10.1117/12.839066
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

Two specimens along different directions are cut from directional Plexiglas plate of biaxial tension. Digital image correlation method in frequency domain is applied to measure elastic modulus. Through analysing elastic modulus along different directions, directional Plexiglas is anisotropic material. Because of the anisotropic mechanical behaviors in directional Plexiglas, the values of fracture toughness are related to the propagation directions of cracks. The specimen is very small, so there is not enough space to put the extensometer. Digital image correlation method in frequency domain which substitutes the extensometer is applied to test crack opening displacement V. In the paper fracture toughness values are tested along two directions. Experiment results indicate that the cracks of different propagation directions have different fracture mechanics properties.

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Xinhua Ji, Wei Shang, Xiaochuan Zhang, and Jinlong Chen "Optical experiment testing for fracture toughness of directional plexiglass along different directions", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751M (24 August 2009); https://doi.org/10.1117/12.839066

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KEYWORDS

Digital image correlation

Mechanics

Phase shifts

Optical testing

Speckle pattern

Polymers

Analytical research

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