Fatigue Behaviour of SiC Particulate‐Reinforced A359 Aluminium Matrix Composites

Abstract

In this work, we describe the fatigue behaviour of silicon carbide (SiCP)‐reinforced A359 aluminium alloy matrix composite considering its microstructure and thermo‐mechanical properties. A variety of heat treatments have been performed for the 20 vol. % SiCp composite, which resulted in different strength and elongation behaviour of the material. The fatigue behaviour was monitored, and the corresponding S–N curves were experimentally derived for all heat treatments. The fatigue strength was found to depend strongly on the heat treatment. In addition, the fatigue behaviour was monitored non‐destructively via the use of lock‐in thermography. The heat wave, generated by the thermo‐mechanical coupling and the intrinsic dissipated energy during mechanical loading of the sample, is detected by a thermal camera.

Carbon Nanotube‐Reinforced Aluminum Matrix Composites

“…HCF results of CNT-reinforced AMCs (stress ratio ¼ AE0.1 and frequency ¼ 1-10 Hz). [232][233][234][235][236][237][238] Figure 15. Schematic illustration of deformation and failure characteristics of fiber-reinforced MMCs during a) tensile and b) fatigue tests; c,d) TEM images of a 3.5% CNT/AA2024 composite after fatigue deformation.…”

“…The authors compared their fatigue results with different Al alloys and AMCs tested under similar conditions. [233][234][235][236][237][238] Under cyclic loading, fiber pull-out type of failure was observed to be more prevalent in contrast to the tensile tests, as also schematically shown in Figure 15a,b. Thus, the reinforcement acts as a bridge under stress-controlled cyclic loading and thus increases the fatigue strength.…”

“…The other phenomenon in the fatigue of MMCs is the “Bauschinger effect.” The decrease in the flow stress under cyclic loading upon the reversal of loading from tensile to compressive and vice versa is known as “Bauschinger effect.” In the case of CNT/Al composites, the dislocation pile‐up is induced by CNTs and leads to a back stress, due to which the composite exhibits superior strain hardening capacity compared with the base metal matrix . Back stress is a long‐range stress caused by the pile‐up of GNDs at the interface of metal matrix and reinforcement.…”

“…Shin and Bae studied the fatigue behavior of CNT/AA2024 MMCs produced by PM route with varying volume fractions of CNTs and observed an increase in fatigue strength with increasing MWCNT content. The authors compared their fatigue results with different Al alloys and AMCs tested under similar conditions . Under cyclic loading, fiber pull‐out type of failure was observed to be more prevalent in contrast to the tensile tests, as also schematically shown in Figure a,b.…”

Effect of Ball Burnishing on HCF of Bilayer Composite for Support Wind Turbine Blades

“…More enhanced fatigue endurance of Al-MMCs than of aluminum only in fatigue and related to an increase in fatigue strength. Moreover, the stress controlled fatigue lives of Al-based MMCs have been reversible relation to particle size, and increased volume fraction within 0.7, and increased matrix tensile strength for a given stress level [13][14]. On the other hand, MMCs exhibit poorer low cycle fatigue (LCF) resistance compared to unreinforced metals under strain-controlled conditions.…”