Mixed-mode I/II fracture of amorphous diamond-like carbon films

Krishna Jonnalagadda; Ioannis Chasiotis

Mixed-mode I/II fracture of amorphous diamond-like carbon films

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

Abstract

Mixed-mode I/II stress intensity factors were obtained from experiments conducted on tetrahedral amorphous diamond-like carbon (ta-C) MEMS-scale specimens. The thin film ta-C specimens contained sharp edge precracks that were generated using microindentation. The crack angle varied in the range of 7°-32° resulting in varying mode mixity (K _II/K _I) at the crack tip. The microscale freestanding fracture specimens were loaded in uniaxial tension and the load at failure was measured and used to calculate the mixed-mode I/II stress intensity factors, K _I and K _II, by a finite element solution. For the limited range of pre-crack angles employed here, the resulting stress intensity factor values were comparable to those obtained for brittle materials tested at the macro scale using similar specimen geometries.

Original language	English (US)
Title of host publication	Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Pages	1353-1357
Number of pages	5
State	Published - Oct 31 2006
Event	SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006 - Saint Louis, MO, United States Duration: Jun 4 2006 → Jun 7 2006

Publication series

Name	Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Volume	3

Other

Other	SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006
Country	United States
City	Saint Louis, MO
Period	6/4/06 → 6/7/06

Keywords

MEMS
Stress intensity factors
Thin films

ASJC Scopus subject areas

Engineering(all)

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Mixed-mode I/II fracture of amorphous diamond-like carbon films. / Jonnalagadda, Krishna; Chasiotis, Ioannis.

Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006. 2006. p. 1353-1357 (Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006; Vol. 3).

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

Jonnalagadda, K & Chasiotis, I 2006, Mixed-mode I/II fracture of amorphous diamond-like carbon films. in Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006. Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006, vol. 3, pp. 1353-1357, SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006, Saint Louis, MO, United States, 6/4/06.

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abstract = "Mixed-mode I/II stress intensity factors were obtained from experiments conducted on tetrahedral amorphous diamond-like carbon (ta-C) MEMS-scale specimens. The thin film ta-C specimens contained sharp edge precracks that were generated using microindentation. The crack angle varied in the range of 7°-32° resulting in varying mode mixity (K II/K I) at the crack tip. The microscale freestanding fracture specimens were loaded in uniaxial tension and the load at failure was measured and used to calculate the mixed-mode I/II stress intensity factors, K I and K II, by a finite element solution. For the limited range of pre-crack angles employed here, the resulting stress intensity factor values were comparable to those obtained for brittle materials tested at the macro scale using similar specimen geometries.",

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N2 - Mixed-mode I/II stress intensity factors were obtained from experiments conducted on tetrahedral amorphous diamond-like carbon (ta-C) MEMS-scale specimens. The thin film ta-C specimens contained sharp edge precracks that were generated using microindentation. The crack angle varied in the range of 7°-32° resulting in varying mode mixity (K II/K I) at the crack tip. The microscale freestanding fracture specimens were loaded in uniaxial tension and the load at failure was measured and used to calculate the mixed-mode I/II stress intensity factors, K I and K II, by a finite element solution. For the limited range of pre-crack angles employed here, the resulting stress intensity factor values were comparable to those obtained for brittle materials tested at the macro scale using similar specimen geometries.

AB - Mixed-mode I/II stress intensity factors were obtained from experiments conducted on tetrahedral amorphous diamond-like carbon (ta-C) MEMS-scale specimens. The thin film ta-C specimens contained sharp edge precracks that were generated using microindentation. The crack angle varied in the range of 7°-32° resulting in varying mode mixity (K II/K I) at the crack tip. The microscale freestanding fracture specimens were loaded in uniaxial tension and the load at failure was measured and used to calculate the mixed-mode I/II stress intensity factors, K I and K II, by a finite element solution. For the limited range of pre-crack angles employed here, the resulting stress intensity factor values were comparable to those obtained for brittle materials tested at the macro scale using similar specimen geometries.

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Mixed-mode I/II fracture of amorphous diamond-like carbon films

Abstract

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Keywords

ASJC Scopus subject areas

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