Determination of fiber bridging stress profile by debond length measurement

Abstract A new technique is developed for measuring the fiber bridging stress in fiber-reinforced ceramic matrix composites (FCMCs). This technique is based on the direct measurement of the debond length associated with a bridged matrix crack in a composite. Theoretical formulations are developed to relate the debond length measurement (DLM) to the applied stress and fiber bridging stress. Subsequently, the DLMs of a bridged crack are used to calculate the bridging stress profile. Simultaneously, the crack opening displacements (CODs) are also measured from which the fiber bridging stress is determined independently. A comparison of the fiber bridging stress obtained from DLM and COD is made. Finally, a new bridging law is proposed and verified based on this study.

[1]  John W. Hutchinson,et al.  Fiber-matrix debonding effects oncracking in aligned fiber ceramic composites , 1995 .

[2]  L. N. McCartney,et al.  Mechanics of matrix cracking in brittle-matrix fibre-reinforced composites , 1987, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[3]  A. Evans.  Perspective on the Development of High‐Toughness Ceramics , 1990 .

[4]  H. Tang,et al.  Failure Analysis of Unidirectional Ceramic Matrix Composites under Flexure , 1989 .

[5]  C. Griffin,et al.  Interfacial Bonding and Friction in Silicon Carbide [Filament]‐Reinforced Ceramic‐ and Glass‐Matrix Composites , 1989 .

[6]  John W. Hutchinson,et al.  Models of fiber debonding and pullout in brittle composites with friction , 1990 .

[7]  W. Hillig.  Strength and Toughness of Ceramic Matrix Composites , 1987 .

[8]  Robert O. Ritchie,et al.  On the quantification of bridging tractions during subcritical crack growth under monotonic and cyclic fatigue loading in a grain-bridging silicon carbide ceramic , 1998 .

[9]  Raj N. Singh,et al.  The generation of multiple matrix cracking and fiber-matrix interfacial debonding in a glass composite , 1998 .

[10]  Direct Measurement of Crack Tip Stresses , 1991 .

[11]  C. Hsueh.  Crack-wake interfacial debonding criteria for fiber-reinforced ceramic composites , 1996 .

[12]  K. Faber,et al.  Interfacial shear stresses in fiber-reinforced glasses , 1990 .

[13]  A. Evans,et al.  The mechanics of matrix cracking in brittle-matrix fiber composites , 1985 .

[14]  A. Kelly,et al.  Theory of multiple fracture of fibrous composites , 1973 .

[15]  P. Steif,et al.  A detailed analysis of cracks bridged by fibers. II: Cracks of intermediate size , 1994 .

[16]  Brian N. Cox,et al.  A J-integral method for calculating steady-state matrix cracking stresses in composites , 1988 .

[17]  C. Galiotis.  Interfacial studies on model composites by laser Raman spectroscopy , 1991 .

[18]  A. Evans,et al.  On large scale sliding in fiber-reinforced composites , 1994 .

[19]  M. Sakai.  Analysis of Fiber-bridging by Extended Dagdale Model , 1992 .

[20]  Surendra P. Shah,et al.  Micromechanical analysis of multiple fracture and evaluation of debonding behavior for fiber-reinforced composites , 1993 .