Investigation of fatigue and fracture behavior in Nb fiber-reinforced MoSi2 composites

W. O. Soboyejo; F. Ye; D. S. Schwartz

Investigation of fatigue and fracture behavior in Nb fiber-reinforced MoSi₂ composites

W. O. Soboyejo
, F. Ye
, D. S. Schwartz

President

SUNY Polytechnic Institute

Ohio State University

Research output: Contribution to conference › Paper › peer-review

Abstract

Fatigue and fracture mechanisms in Nb fiber-reinforced MoSi₂ composites are elucidated in this paper. The effects of fiber diameter on fracture and crack-tip shielding mechanisms are discussed after a review of micromechanical models which are applied to the prediction of residual stress levels, toughening and microcracking phenomena. Toughening is shown to occur by a combination of crack bridging and crack-tip blunting under monotonic and cyclic loading. However, the observed failure mechanisms are different under monotonic and cyclic loading. Improved fatigue crack growth resistance is demonstrated in lower toughness composites with larger fiber diameters. The occurrence of slower fatigue crack growth rates in the composites reinforced with smaller diameter Nb fibers is rationalized by assessing the combined effects of fiber spacing and interfacial crack growth on the average crack growth rates within the composites.

Original language	English
Pages	661-694
Number of pages	34
State	Published - 1995
Event	Proceedings of the 1995 ASME International Mechanical Congress and Exposition - San Francisco, CA, USA Duration: Nov 12 1995 → Nov 17 1995

Conference

Conference	Proceedings of the 1995 ASME International Mechanical Congress and Exposition
City	San Francisco, CA, USA
Period	11/12/95 → 11/17/95

Cite this

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title = "Investigation of fatigue and fracture behavior in Nb fiber-reinforced MoSi2 composites",

abstract = "Fatigue and fracture mechanisms in Nb fiber-reinforced MoSi2 composites are elucidated in this paper. The effects of fiber diameter on fracture and crack-tip shielding mechanisms are discussed after a review of micromechanical models which are applied to the prediction of residual stress levels, toughening and microcracking phenomena. Toughening is shown to occur by a combination of crack bridging and crack-tip blunting under monotonic and cyclic loading. However, the observed failure mechanisms are different under monotonic and cyclic loading. Improved fatigue crack growth resistance is demonstrated in lower toughness composites with larger fiber diameters. The occurrence of slower fatigue crack growth rates in the composites reinforced with smaller diameter Nb fibers is rationalized by assessing the combined effects of fiber spacing and interfacial crack growth on the average crack growth rates within the composites.",

author = "Soboyejo, \{W. O.\} and F. Ye and Schwartz, \{D. S.\}",

year = "1995",

language = "English",

pages = "661--694",

note = "Proceedings of the 1995 ASME International Mechanical Congress and Exposition ; Conference date: 12-11-1995 Through 17-11-1995",

}

TY - CONF

T1 - Investigation of fatigue and fracture behavior in Nb fiber-reinforced MoSi2 composites

AU - Soboyejo, W. O.

AU - Ye, F.

AU - Schwartz, D. S.

PY - 1995

Y1 - 1995

N2 - Fatigue and fracture mechanisms in Nb fiber-reinforced MoSi2 composites are elucidated in this paper. The effects of fiber diameter on fracture and crack-tip shielding mechanisms are discussed after a review of micromechanical models which are applied to the prediction of residual stress levels, toughening and microcracking phenomena. Toughening is shown to occur by a combination of crack bridging and crack-tip blunting under monotonic and cyclic loading. However, the observed failure mechanisms are different under monotonic and cyclic loading. Improved fatigue crack growth resistance is demonstrated in lower toughness composites with larger fiber diameters. The occurrence of slower fatigue crack growth rates in the composites reinforced with smaller diameter Nb fibers is rationalized by assessing the combined effects of fiber spacing and interfacial crack growth on the average crack growth rates within the composites.

AB - Fatigue and fracture mechanisms in Nb fiber-reinforced MoSi2 composites are elucidated in this paper. The effects of fiber diameter on fracture and crack-tip shielding mechanisms are discussed after a review of micromechanical models which are applied to the prediction of residual stress levels, toughening and microcracking phenomena. Toughening is shown to occur by a combination of crack bridging and crack-tip blunting under monotonic and cyclic loading. However, the observed failure mechanisms are different under monotonic and cyclic loading. Improved fatigue crack growth resistance is demonstrated in lower toughness composites with larger fiber diameters. The occurrence of slower fatigue crack growth rates in the composites reinforced with smaller diameter Nb fibers is rationalized by assessing the combined effects of fiber spacing and interfacial crack growth on the average crack growth rates within the composites.

UR - https://www.scopus.com/pages/publications/0029425985

M3 - Paper

SP - 661

EP - 694

T2 - Proceedings of the 1995 ASME International Mechanical Congress and Exposition

Y2 - 12 November 1995 through 17 November 1995

ER -

Investigation of fatigue and fracture behavior in Nb fiber-reinforced MoSi₂ composites

Abstract

Conference

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