پیش‌بینی عمر خستگی اتصالات جوشی حین بهره‌برداری وصله‌ای با استفاده از معیارهای خستگی چندمحوره

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران

2 دانشکده مهندسی عمران، دانشگاه خواجه نصیرالدین طوسی، تهران، ایران

چکیده

پژوهش حاضر به بررسی تجربی و عددی عمر خستگی اتصالات جوشی وصله‌ای فولادی حین بهره‌برداری پرداخته است. مجموعاً سه نوع پانل با دستورالعمل جوشکاری مشابه اما خنک‌کاری متفاوت ساخته شد و سپس نمونه‌های بریده شده از پانل اصلی تحت آزمون‌های تجربی خستگی قرار گرفت. به منظور پیش‌بینی عمر خستگی نمونه‌ها، از یک رویکرد نوین مبتنی بر سختی‌سنجی پیوسته در مقطع جوشکاری استفاده شد. بدین منظور در گام نخست، از تصاویر ماکروگرافی و میکروسختی پیوسته مقاطع جوشکاری شده جهت تعیین خواص مکانیکی و پارامترهای خستگی مناطق مختلف جوش و منطقه متأثر از حرارت استفاده شد. سپس مقادیر تنش و کرنش حاصل از تحلیل المان محدود با نرم‌افزار آباکوس، با بکارگیری سابروتین UVARM و کدنویسی مدل‌های خستگی چندمحوری، جهت تخمین عمر قطعات مورد استفاده قرار گرفت. در گام بعدی، نتایج حاصل از تخمین عمر عددی با معیارهای خستگی، با نتایج تجربی آزمون‌های خستگی مقایسه شد و خطای معیارهای مورد استفاده گزارش شد. نتایج آزمون‌های تجربی نشان داد که نمونه‌های خنک شده با آب سرعت 0/5 متر‌در‌ثانیه افزایش عمر و نمونه‌های خنک شده با آب سرعت 1/5 متر در ثانیه کاهش عمر در مقایسه با نمونه‌های خنک شده در هوا دارند. به منظور پیش‌بینی عمر خستگی، به ترتیب از معیارهای بروان-میلرمارو و گلینکا استفاده شد و نتایج نشان داد که این دو معیار به ترتیب با حداکثر خطای میانگین 20/16 و 34/68 درصد قابلیت پیش‌بینی عمر خستگی را دارند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Fatigue Life Estimation of In-Service Welded Patch Using Multiaxial Fatigue Criteria

نویسندگان [English]

  • sajjad Barzegar-Mohammadi 1
  • Mohammad haghpanahi 1
  • Mostafa Zeinoddini 2
1 PhD candidate of Mechanical engineering faculty, Iran University of Science and Technology, Tehran, Iran
2 Faculty of Civil Engineering, Khajeh Nasir Toosi University of Technology, Tehran, Iran
چکیده [English]

The present research has investigated the fatigue life of in-service steel patch welded joints by experimental/numerical approaches. To this end, three types of welded panels with similar Welding Procedure Specification but different cooling conditions were constructed. Subsequently, test samples cut from the main panels were subjected to fatigue tests. A novel approach involving continuous hardness measurement at the welding section was employed to predict the mechanical and fatigue properties of different zones in welded specimens. Firstly, the mechanical properties and fatigue parameters of various weld regions and heat affected zone were calculated using microhardness measurement and metallography images. Then, stress analysis was conducted in the Abaqus. The fatigue life was predicted using the stress and strain values obtained from the finite element analysis, the UVARM subroutine, and multiaxial fatigue modeling codes. The life estimations obtained from the numerical models were ultimately compared by experimental fatigue test results. The experimental tests showed that the samples cooled with water at a speed of 0.5 m/s had an increase in life, and the samples cooled with water at a speed of 1.5 m/s had a decrease in life compared to the samples cooled in air. Moreover, to predict the fatigue life, Brown-Miller-Marrow and Glinka criteria were used, respectively, and the results showed that these two criteria are able to predict the fatigue life with the maximum average error of 20.16% and 34.68%, respectively.

کلیدواژه‌ها [English]

  • In-service welding
  • Fatigue life prediction
  • Steel welded patch
  • Finite element method
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