نوع مقاله : مقاله پژوهشی
نویسنده
دانشکده مهندسی مکانیک، واحد ورامین-پیشوا، دانشگاه آزاد اسلامی، تهران، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
The aim of this study is to evaluate the effect of residual stress on the high cycle fatigue (HCF) life for XU7JP/L3 engine coated piston. In this paper, HCF life analysis of the piston is performed by using finite element method and ANSYS software to predict the temperature and stresses and then HCF life by using Goodman theory and ANSYS nCode Design Life software. . The obtained thermo-mechanical analysis results proved that the thermal barrier coating system reduces the stress distribution in the piston by about 11 MPa. The results of finite element analysis (FEA) indicated that the stress and number of cycles to failure have the most critical values at the upper portion of piston pin. The HCF life results showed that the number of cycles of failure for the coated piston is approximately 36% higher than the uncoated piston. According to the fatigue life analysis results, neglecting the residual stress effect led to estimating about 6.4% higher than the limit. Therefore, it is necessary to consider the residual stress effect in the analysis of the HCF life of the coated piston. Thermo-mechanical analysis and HCF life results are compared with experimentally damaged piston to evaluate the results appropriately. It has been shown that critical identified area match well with area of failure in the experimental sample.
کلیدواژهها [English]
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