Subsonic and intersonic dynamic crack growth in unidirectional composites

Demirkan Coker, Ares J. Rosakis, Yonggang Y. Huang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Some recent experimental observations of highly dynamic crack growth events in thick unidirectional graphite fiber-reinforced epoxy matrix composite plates are presented. The composite plates were symmetrically (mode-I) and asymmetrically (mode-II) loaded in a one-point bend configuration with an edge pre-notch machined in the fiber direction. The lateral shearing interferometric technique of coherent gradient sensing (CGS) was used in conjunction with high-speed photography. Symmetric, mode-I cracks initiated at 1300 m/s and subsequently accelerated up to the Rayleigh wave speed but never exceeded it. For asymmetric, Mode-II types of loading, the results reveal highly unstable and intersonic, shear-dominated crack growth along the fibers. The intersonic cracks propagated with unprecedented speeds reaching 7400 m/s, more than three times the shear wave speed of the composite, and featured a shock wave structure typical of disturbances travelling with speeds higher than one of the characteristic wave speeds in the solid.

Original languageEnglish (US)
Title of host publicationAmerican Society of Mechanical Engineers, Applied Mechanics Division, AMD
PublisherASME
Pages75-86
Number of pages12
Volume235
ISBN (Print)0791816524
StatePublished - Dec 1 1999
EventThick Composites for Load Bearing Structures - 1999 (The ASME International Mechanical Engineering Congress and Exposition) - Nashville, TN, USA
Duration: Nov 14 1999Nov 19 1999

Other

OtherThick Composites for Load Bearing Structures - 1999 (The ASME International Mechanical Engineering Congress and Exposition)
CityNashville, TN, USA
Period11/14/9911/19/99

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ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Coker, D., Rosakis, A. J., & Huang, Y. Y. (1999). Subsonic and intersonic dynamic crack growth in unidirectional composites. In American Society of Mechanical Engineers, Applied Mechanics Division, AMD (Vol. 235, pp. 75-86). ASME.