SUBSONIC AND INTERSONIC DYNAMIC CRACK GROWTH IN UNIDIRECTIONAL COMPOSITES

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

doi:10.1115/IMECE1999-0906

SUBSONIC AND INTERSONIC DYNAMIC CRACK GROWTH IN UNIDIRECTIONAL COMPOSITES

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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 language	English (US)
Title of host publication	Thick Composites for Load Bearing Structures
Publisher	American Society of Mechanical Engineers (ASME)
Pages	75-86
Number of pages	12
ISBN (Electronic)	9780791816523
DOIs	https://doi.org/10.1115/IMECE1999-0906
State	Published - 1999
Externally published	Yes
Event	ASME 1999 International Mechanical Engineering Congress and Exposition, IMECE 1999 - Nashville, United States Duration: Nov 14 1999 → Nov 19 1999

Publication series

Name	ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume	1999-AF

Conference

Conference	ASME 1999 International Mechanical Engineering Congress and Exposition, IMECE 1999
Country/Territory	United States
City	Nashville
Period	11/14/99 → 11/19/99

Funding

This investigation was supported by the Office of Naval Research (Dr. Y. D. S. Rajapakse, Scientific Officer) through a grant to Caltech and is gratefully acknowledged.

ASJC Scopus subject areas

Mechanical Engineering

Access to Document

10.1115/IMECE1999-0906

Cite this

Coker, D., Rosakis, A. J., & Huang, Y. Y. (1999). SUBSONIC AND INTERSONIC DYNAMIC CRACK GROWTH IN UNIDIRECTIONAL COMPOSITES. In Thick Composites for Load Bearing Structures (pp. 75-86). (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); Vol. 1999-AF). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE1999-0906

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title = "SUBSONIC AND INTERSONIC DYNAMIC CRACK GROWTH IN UNIDIRECTIONAL COMPOSITES",

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.",

author = "Demirkan Coker and Rosakis, {Ares J.} and Huang, {Yonggang Y.}",

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year = "1999",

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language = "English (US)",

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Coker, D, Rosakis, AJ & Huang, YY 1999, SUBSONIC AND INTERSONIC DYNAMIC CRACK GROWTH IN UNIDIRECTIONAL COMPOSITES. in Thick Composites for Load Bearing Structures. ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), vol. 1999-AF, American Society of Mechanical Engineers (ASME), pp. 75-86, ASME 1999 International Mechanical Engineering Congress and Exposition, IMECE 1999, Nashville, United States, 11/14/99. https://doi.org/10.1115/IMECE1999-0906

SUBSONIC AND INTERSONIC DYNAMIC CRACK GROWTH IN UNIDIRECTIONAL COMPOSITES. / Coker, Demirkan; Rosakis, Ares J.; Huang, Yonggang Y.
Thick Composites for Load Bearing Structures. American Society of Mechanical Engineers (ASME), 1999. p. 75-86 (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); Vol. 1999-AF).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N2 - 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.

AB - 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.

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SUBSONIC AND INTERSONIC DYNAMIC CRACK GROWTH IN UNIDIRECTIONAL COMPOSITES

Abstract

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