Stress-wave induced fracture of unidirectional composites: an experimental study using digital image correlation method

Dongyeon Lee; Hareesh V. Tippur

doi:10.1117/12.854790

14 April 2010 Stress-wave induced fracture of unidirectional composites: an experimental study using digital image correlation method

Dongyeon Lee, Hareesh V. Tippur

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Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 752202 (2010) https://doi.org/10.1117/12.854790
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

In this work, fracture behavior of unidirectional graphite/epoxy composite materials is optically investigated. Single-edge notched coupons are studied under geometrically symmetric impact loading. The notch orientation parallel to or at an angle relative to the fiber orientation is considered to produce mode-I as well as mixed-mode fracture. Stress-wave induced crack initiation and rapid crack growth events are studied using a digital correlation technique and high-speed photography. Surface deformations histories in the crack-tip vicinity are obtained by analyzing decorated speckle recordings. Measured deformation fields are used to extract fracture parameters and examine the effect of fiber orientation on crack initiation and growth behaviors. The maximum crack speed observed is the highest for mode-I dominant conditions and decreases with increasing fiber orientation angle. With increasing fiber orientation angle, crack takes longer to attain the maximum speed upon initiation. The crack initiation toughness values decrease with increasing degree-of-anisotropy.

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Dongyeon Lee and Hareesh V. Tippur "Stress-wave induced fracture of unidirectional composites: an experimental study using digital image correlation method", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 752202 (14 April 2010); https://doi.org/10.1117/12.854790

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KEYWORDS

Composites

Digital image correlation

High speed photography

Cameras

Photography

Speckle

Digital cameras

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