Characterization of fiber/matrix interface strength: applicability of different tests, approaches and parameters

2005 ◽  
Vol 65 (1) ◽  
pp. 149-160 ◽  
Author(s):  
S ZHANDAROV
Keyword(s):  
Interface Strength ◽  
Matrix Interface ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

scholarly journals Characterization of fiber matrix interface of continuous‐discontinuous fiber reinforced polymers on the microscale

PAMM ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Benedikt Rohrmüller ◽  
Michael Schober ◽  
Kerstin Dittmann ◽  
Peter Gumbsch ◽  
Jörg Hohe
Keyword(s):  
Fiber Reinforced Polymers ◽  
Matrix Interface ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Discontinuous Fiber ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

Measuring Interface Strength in Single Fiber Composites: The Effect of Stress Concentrations

2000 ◽  
Vol 629 ◽  
Author(s):  
G. A. Holmes ◽  
R. C. Peterson
Keyword(s):  
Fragment Length ◽  
Interface Strength ◽  
Matrix Interface ◽  
Stress Concentrations ◽  
New Model ◽  
Testing Rate ◽  
Mechanics Model ◽  
The Matrix ◽  
Fiber Matrix Interface ◽  
Fiber Matrix

ABSTRACTFiber-matrix interface strength is known to be a critical factor in controlling the long-term performance of structural composites. This parameter is often obtained by using the average fragment length data generated from the single-fiber fragmentation test (SFFT). The interfacial shear strength is then determined by using this data in a micro-mechanics model that describes the shear-stress transfer process between the matrix and the fiber. Recently, a non-linear viscoelastic micro-mechanics model was developed to more accurately account for the matrix material properties. This new model indicates that the interface strength is dependent on the testing rate. Experimentally, it has been shown that the final fragment length distribution in some systems is dependent on the testing rate. However, data analysis using the new model indicates that the distribution change with testing rate is promoted by the presence of high stress concentrations at the end of the fiber fragments. From the model, these stress concentrations were found to exist at very low strain values. Experimentally, the fragment distributions obtained from specimens tested by different testing rates were found to be significantly different at strain values well below the strain values required to complete the test. These results are consistent with the research of Jahankhani and Galiotis and finite element calculations performed by Carrara and McGarry. These authors concluded that stress concentrations can promote failure of the fiber-matrix interface on the molecular level. Our results support this conclusion. In addition, our research results suggest that altering the SFFT testing rate can lower the magnitude of these stress concentrations and minimize failure of the fiber-matrix interface.

Characterization of Fiber-Reinforced SiC Composites by Precursor-Pyrolysis and Hot-Pressing

2007 ◽  
Vol 280-283 ◽  
pp. 1305-1308
Author(s):  
Xin Bo He ◽  
Xuan Hui Qu ◽  
Chang Rui Zhang ◽  
Xin Gui Zhou
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Fracture Behavior ◽  
Matrix Interface ◽  
Direct Reactions ◽  
Fiber Matrix Interface ◽  
Fiber Matrix ◽  
Sic Composites ◽  
Strength Retention

CF/SiC and Hi-Nicalon/SiC composites were prepared by precursor pyrolysis-hot pressing, and the microstructure and fracture behavior of the composites were investigated. Because of a strongly bonded fiber/matrix interface primarily resulting from the direct reactions between the fibers and matrix, Hi-Nicalon/SiC composite exhibited a typical brittle fracture behavior. However, CF/SiC composite displayed a tough fracture behavior with extensive fiber pullout, which was primarily attributed to a weakly bonded fiber/matrix interface as well as higher strength retention of the fibers. As a result, CF/SiC composite achieved better mechanical properties of 691.6 MPa in strength and 20.7 MPa•m1/2 in toughness, which were much higher than those of Hi-Nicalon/SiC composite.

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