کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7167043 1462934 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Failure analysis and structural improvement for cracked circular finned tube
ترجمه فارسی عنوان
تجزیه و تحلیل شکست و بهبود ساختاری لوله ترک خورده دایره ای
کلمات کلیدی
تحقیق متالورژی، روش عنصر محدود ارتعاش موجب ارتعاش، استرس ترک خوردگی، تجزیه و تحلیل مودال،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
This paper deals with a tube cracking of a heat exchanger. The cause of the failure was studied, with a focus on the effect of caustic brittle fracture on stress corrosion cracking base on the research in the austenitic stainless steels. The cracks were examined at on the surface of the real cracked tubes and artificial specimen of same tube and fin with SS310S and SS316L respectively by metallurgical investigation. In addition, the stress analysis was performed by a finite element analysis (FEA). Through the results of the structural analysis and computational fluid dynamics calculations, any external forces and deformations due to difference of the strain from a thermal expansion can cause a bending force. In particular, the cracks can be grown when an external force was exciting such as a vortex-induced vibration. Besides, cracks on the tube can be accelerated under several adverse conditions with a corrosion environment and low damping fluid flow. In order to identify the accurate prediction of flow velocities for surrounding tube bundle, 2D computational fluid dynamics (CFD) is essential for simulating the flow-induced vibration. Through them processing, oscillated vortices according to induced velocities are predicted with around 76.5 Hz. As a result, the system has a risk against vortex-induced vibrations due to a number of resonant modes that might have been identified according to a modal analysis. Therefore, this paper suggests an optimal design for improvement with numerical simulation by FEA.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Failure Analysis - Volume 92, October 2018, Pages 95-106
نویسندگان
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