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Thermal shock/fatigue evaluation of FGM by AE technique |
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| Authors: | Jun-Hee Song Jae-Kyoo Lim H Takahashi |
| Affiliation: | 1. Graduate school, Department of Precision Mechanical Engineering, Chonbuk National University, Chonju, Korea 2. Department of Mechanical Design, Chonbuk National University, Chonju, Korea 3. Research Institute for Fracture Technology, Faculty of Engineering, Tohoku University, Sendai, Japan |
| Abstract: | This study has been carried out to analyze the thermal shock and fatigue characteristics of functionally gradient material (FGM). The thermal shock/fatigue tests were conducted at a specific temperature and fracture patterns were studied by SEM and AE. Also, thermal fracture behavior of plasma-sprayed FGM and conventional coating material (NFGM) was examined by acoustic emission technique under heating and cooling. Furnace cooling and air cooling tests were used to examine the effect of temperature change under various conditions. The conventional and FGM coatings were compared to heat-resistant property and fracture surface of these materials for each temperature history. Based on these results, some critical temperature at the onset of coating failure can be evaluated to characterize the thermal resistance of the materials. It turned out to be that FGM gives higher thermal property compared with NFGM by AE signal and fracture surface analysis. |
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