کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
776514 1463739 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fatigue properties of rock salt subjected to interval cyclic pressure
ترجمه فارسی عنوان
خواص خستگی سنگ نمک تحت فشار دوره ای فاصله ای
کلمات کلیدی
سنگ نمک؛ خستگی؛ زمان فاصله؛ تغییر شکل برگشت ناپذیر
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی


• This work presents the experimental evidence for the impact of time interval.
• A preliminary interval fatigue life model is established.
• Residual stress and Bauschinger effect are the reason for decreasing fatigue life.

Due to the influence of gas pressure operational modes, surrounding rock of salt carven underground gas storage always suffers combined stress composed of cyclic pressure and intervals of no stress (or small stress). We conducted comparisons between conventional fatigue tests and (six groups of) interval fatigue tests, which combine spaced stress cycles and normal stress cycles. Experimental measurements demonstrate that the combined cyclic stress has a strong impact on the fatigue activity of rock salt. In interval fatigue tests, the residual strain of a spaced stress cycle is notably larger than that of a normal stress cycle. As the conventional tests can be actually considered as a kind of fatigue tests with transitory intervals, the accumulative rate of residual deformation increases with the duration of the interval in all test groups. The testing results show the fatigue lives of samples from interval fatigue tests dramatically reduce in a certain range; when intervals extend beyond the value 120 s, fatigue lives perform with a slight rise. Based on the S–N curve and the S–T curve, an experiential model fitting the relationship between fatigue life and interval was established.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 90, September 2016, Pages 109–115
نویسندگان
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