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Fatigue Crack Growth Characteristics of $SiC_p/Al-Si$ Alloy Composites for Automotive Structures  

Koh Seungkee (School of Mechanical Engineering, Kunsan National University)
Lee Haemoo (Korea Research Institute of Standard and Science)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.13, no.4, 2005 , pp. 174-181 More about this Journal
Abstract
In order to investigate the behavior of fatigue crack growth of SiC-particulate- reinforced Al-Si alloy composites, fatigue tests using single edge notched tension(SENT) specimens were performed. Composite materials were manufactured by using both permanent die casting and extrusion processes with different volume fractions of $10\%\;and\;20\%$. $SiC_p-reinfurced$ Al-Si composites showed the increased levels of threshold stress intensity factor range, ${\Delta}K_{th}$, for the increased volume fractions of SiC particles, which implies the increased fatigue crack growth resistance at the threshold or low ${\Delta}K$ levels, compared to the unreinforced Al-Si alloy. In the Paris region, however, the composites showed the increased rate of crack growth resulting in the unfavorable effects on the fatigue crack growth resistance. Critical stress intensity factor range at unstable crack growth leading to final fracture decreased as the volume fraction of SiC particle increased, because of the reduced fracture toughness of the composites. Extruded materials showed higher threshold and critical values than the cast materials.
Keywords
Metal matrix composites; Volume fraction; Fatigue crack growth; Stress intensity factor; Crack closure;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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