شبیه سازی عددی جوشکاری لیزری، بررسی تنش پسماند و توزیع دما در اتصال روی هم آلیاژهای آلومینیومی AA6061 وAA5086 در ضخامت های متفاوت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، مهندسی مکانیک، دانشگاه تبریز، تبریز

2 دانشگاه تبریز

چکیده

در پژوهش حاضر با استفاده از کد اجزاء محدود آباکوس 2017 و بکارگیری زیر برنامه دیفالکس به زبان فرترن تحلیل عددی سه بعدی جوشکاری لیزری در حالت هندسی روی هم دو آلیاژ غیر هم جنس آلومینیومی AA6061 و AA5086 صورت گرفته است. تأثیر قرارگیری آلیاژ سخت‌تر و نرم‌تر در قسمت فوقانی و تحتانی جوش در ضخامت‌های 1 و 5/1 میلی‌متری دو قطعه بر مواردی همچون: توزیع حرارتی ، وسعت مناطق مختلف جوش و تنش پسماند ناشی از جوشکاری لیزری مطالعه و بررسی شده است. در مجموع و براساس شرایط ورودی مسأله هشت وضعیت جهت شبیه‌سازی آماده شد. براساس نتایج بدست آمده نمونه A4 پایین‌ترین اختلاف دما بیشینه بین قسمت فوقانی و تحتانی را در بین همه حاالت داراست که این اختلاف کمتر به دلیل قرارگیری فلز سخت‌تر و با ضخامت کمتر در قسمت فوقانی اتصال می‌باشد. در همه حاالت مورد بررسی فارغ از موقعیت قرارگیری در بخش فوقانی و یا تحتانی، تنش پسماند طولی بزرگتر در بخش آلیاژ سخت‌تر، آلیاژ AA6061 روی خواهد داد. همچنین بر اساس نتایج بدست آمده، در همه حاالت بیشینه تنش پسماند طولی ایجاد شده در حدود مقدار تنش تسلیم آلیاژ سختتر می‌باشد. بهترین حالت از نظر سطح تنش پسماند طولی σzz در قطعه کار به ترتیب مربوط به وضعیت‌های A1 و B1 است زیرا هم سطح تنش پسماند کششی پایین‌تری را تجربه می‌نمایند و هم میزان اختالف تنش در دو ناحیه فوقانی و تحتانی این نمونه‌ها اختلاف پایین‌تری با یکدیگر دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical Simulation of Laser Welding and Evaluation of Residual Stress and Temperature Distribution in Lap Joint of AA6061 and AA5086 Aluminum Alloys in Different Thicknesses

نویسندگان [English]

  • amir ghiasvand 1
  • Soran Hassanifard 2
1 Ph.D. Student, Mech. Eng., Tabriz Univ., Tabriz, Iran
2 University of Tabriz
چکیده [English]

In the present study, using the ABAQUS 2017 finite element code and using the DFLUX subroutine, a 3D numerical analysis of laser welding in the lap joint of AA6061 and AA5086 aluminum alloys was carried out. The effect of the position of a harder and softer alloy on the upper and lower parts of the weld in two different thicknesses of the two parts was studied on such cases as: thermal distribution, the width of the different welding regions and the residual stress caused by laser welding. In total, and based on the input conditions of the problem, 8 states were prepared for simulation. Based on the results, the A4 sample has the lowest temperature difference between the upper and lower parts in all of these states, which is due to the presence of harder metal with lower thickness in the upper part of the joint. In all cases, regardless of the position of the upper or lower parts, the higher longitudinal residual stresses will occur in the harder part, the AA6061 alloy, and in all states the maximum longitudinal residual stress formed over the yield stress of the harder alloy. Regarding the level of σzz in the workpiece, the best conditions are, respectively, A1 and B1, because they also experience lower residual stresses levels, and the difference in residual stress between the two upper and lower regions of these states is lower.

کلیدواژه‌ها [English]

  • Laser welding
  • ALUMINUM ALLOY
  • Numerical modeling
  • temperature distribution
  • Residual stress
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