The Analysis of Time-Dependent Thermo-Mechanical Creep in Functionally Graded Al-SiC Composites Under Various Operating Temperatures

摘要

A method of successive elastic solution was utilized to investigate the time-dependent thermo-me-chanical creep behavior of functionally graded Al-SiC composites, taking the difference between fabrication and operating temperatures into consideration. The effect of three operating temperatures (equal to, below and higher than fabrication temperature) on the time-dependent creep behavior of layered FGM structures was studied. For all the FGM samples (two-, three- and four-layered structures), the content of the reinforcing particles was considered to increase through the height of the samples. The results showed that selecting the operating temperature below the fabrication temperature and decreasing the number of layers had an adverse effect on the creep resistance of the FGM structures. This effect was more pronounced for the samples operating below their fabrication temperature. This phenomenon was discussed on the basis of the level of effective stresses developed in each layer of the FGM structures.