Matrix-Fiber Interface Characterization in Metal Matrix Composites Using Ultrasonic Shear-Wave Back-Reflection Coefficient Technique
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There are several methods to characterize the interfacial strength between matrix and fiber in metal matrix composites: destructively, using “push-out” tests, or the “fiber fragmentation” technique, by subjecting a single fiber sample (made by diffusion bonding of two matrix plates) to axial loading and by measuring the size of fragments that is linked to the “load transfer behavior”. The critical length of fiber for load transfer is a function of the interfacial shear stress . Recently, ultrasonic imaging of the fiber fragmentation , in conjunction with advanced signal processing techniques , was performed by the authors.