کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7196313 1468309 2017 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Observation of micro-cracks beneath fracture surface during dynamic crack propagation
ترجمه فارسی عنوان
مشاهده تراکم های کوچک زیر سطح شکست در طی انتشار تراکم پویا
کلمات کلیدی
نمونه بردار، شکستگی ضعیف، انتشار تکرار سریع، ریزش میکروکراک، فولاد سازه،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی
In this study, micro-cracks generated during dynamic crack propagation were investigated for an ESSO specimen and V-notched Charpy specimen. The ESSO test with temperature gradient and the Charpy impact test were conducted for steel for shipbuilding. The macroscopic roughness of the fracture surface increases with increasing temperature. The section beneath the fracture surface generated during dynamic brittle crack propagation was observed using a scanning electron microscope, after cutting with a focused ion beam or grinding. Many micro-cracks can be found beneath the brittle fracture surface in the V-notched Charpy specimen. In the ESSO specimen, which had a macroscopic flat surface, micro-cracks can be detected beneath the main crack propagated in the temperature range from −140 °C to −100 °C. On the other hand, there were a few micro-cracks beneath the main crack propagated at relatively high temperature, at which the fracture surface was macroscopically rough. The number of micro-cracks in the Charpy specimen is fewer than those in the ESSO specimen at the same temperature. The observations indicated that the correlations of Charpy impact properties with crack arrest performance for the ESSO specimen was inconvincible in terms of the differences in the micro-scale fracture behavior as well as lack of theoretical basis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theoretical and Applied Fracture Mechanics - Volume 92, December 2017, Pages 178-184
نویسندگان
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