نوع مقاله : مقاله پژوهشی
نویسندگان
1 کارشناسی ارشد، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران،
2 استادیار، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران،
3 استاد، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران،
4 دانشیار،گروه مهندسی مواد و متالورژی، دانشکده فنی و مهندسی، دانشگاه اراک، اراک، ایران،
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Fatigue behavior of GUARDO Carabiner made from Al-7175 was investigated in this study. Monotonic tensile test with a cross-head speed of 35 mm.min-1 was applied on one of the Carabiners, before application of fatigue test on a similar Carabiner under a load range of 0-15 kN and a frequency of 2 Hz using a Falling Factor of 2 (this is equivalent to the free fall of a person with 120 kg weight whom attached to a rope and falls from a hight of 6 m). Under the above-mentioned condition, the fatigue life of the Carabiner was 2227 cycles. Fatigue fracture surface of the Carabiner was also examined by Scanning Electron Microscope. The results of fractography showed the formation of all the three stages of fatigue cracking as expected, as well as the presence of secondary cracks in the vicinity of brittle phases. A geometrical model of the Carabiner was designed using CATIA and specific mesh size applied on it in ABAQUS software. Simulations via ABAQUS were performed for various cyclic tensile load ranges (3, 9, 13, 15, 21 kN) with a frequency of 2 Hz. The output data for each simulation were used as input data in FE-safe software in order to estimate the fatigue life of Carabiner model. In FE-safe software, fatigue properties of Al-7175 were estimated and then Manson-Coffin-Basquin equation was used for prediction of fatigue life of carabiner for each cyclic tensile loading. Finally, a mathematical model was proposed in order to predict the relationship between the applied force and the number of cycles to failure.
کلیدواژهها [English]
11.The Carabiner Handbook [Internet]. [cited 2021 Oct 8]. Available from: https://www.climbing.com/gear/the-carabiner-handbook/