بررسی تجربی و عددی فرآیند تنش‌زدایی ارتعاشی در یک اتصال جوشی T شکل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، مهندسی مکانیک، دانشکدگان فنی، دانشگاه تهران، تهران

2 دانشیار، مهندسی مکانیک، دانشکدگان فنی، دانشگاه تهران، تهران

چکیده

از جمله روش‌های مرسوم تنش‌زدایی که می‌توان پس از انجام فرآیند ساخت بر روی قطعه اجرا نمود تنش‌زدایی حرارتی و ارتعاشی هستند. از مزایای روش تنش‌زدایی ارتعاشی نسبت به تنش‌زدایی حرارتی می‌توان به عدم نیاز به فیکسچر بندی، صرفه جویی در وقت و هزینه، عدم محدودیت وزنی و ابعادی و قابلیت استفاده برای تمامی آلیاژها نام برد. در این پژوهش به مطالعه عددی و تجربی تنش زدایی ارتعاشی یک اتصال جوشی T شکل پرداخته شده است. در گام اول نمونه T شکل با فرایند جوشکاری قوس الکتریکی ساخته شد. تنش‌های پسماند ایجاد شده درطول خط جوش به میزان 251 مگاپاسکال و در عرض خط جوش به میزان 191 مگاپاسکال اندازه گیری شد. انحراف ناشی از تنش‌های پسماند بدست آمده از شبیه‌سازی فرایند جوشکاری با نتیجه حاصل از مقادیر تجربی در راستای طولی حدود 17درصد و در راستای عرضی حدود 1.5 درصد بدست آمد. در ادامه ازطریق شبیه سازی المان محدود فرآیند تنش زدایی ارتعاشی، مقادیر بهینه پارامترهای مؤثر بر تنش‌زدایی ارتعاشی مانند فرکانس اعمال نیرو، میزان نیرو و محل اعمال نیرو، به دست آمد. موثرترین حالت در مدل‌سازی تنش‌زدایی ارتعاشی مربوط به زمانی است که نیروی اعمالی در آن 20% نیرو تسلیم قطعه و فرکانس تحریک 95% فرکانس طبیعی قطعه لحاظ گردد. نتایج اندازه‌گیری تجربی پس از تنش‌زدایی ارتعاشی با نتایج مدل‌سازی خطای 10درصدی را نشان داد . نتایج نشان داد که با افزایش فرکانس بار اعمالی تا 95% فرکانس طبیعی، تنش‌های پسماند طولی بیش از 55 درصد و تنش‌های عرضی حدود 70 درصد کاهش یافته‌‌اند.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental and numerical investigation of the vibration stress relief process on a T- shape welded joint

نویسندگان [English]

  • Pouria Shahfaragh 1
  • Mohammadreza Farahani 2
  • Majid Safarabadi Farahani 2
  • Majid Farhang 1
1 School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
2 School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
چکیده [English]

Thermal and vibration stress relieving processes are among the common methods of reducing residual stresses that can be performed on the part after the manufacturing. The advantages of vibratory stress relief over thermal stress relief are no need for fixtures, time and cost savings, no weight and dimensional limitations and usability for all alloys. In this research, the numerical and experimental study of vibration stress relief process of a T-shaped weld has been done. In the first step, a T-joint was made using shielded metal arc welding . The longitudinal and transverse residual stresses equal to 251 MPa and 191 MPa were measured, respectively. The differences between the calculated and the measured residual stresses in the longitudinal and transverse direction are about 17% and 1.5%, respectively. Then, by finite element simulating the vibration stress relieving process, the optimal values of the parameters affecting the process, such as the frequency of force exertion, the amount of force and the location of force exertion, were obtained. The most effective vibration stress relief condition related to the case with the applied force equal to 20% of the  yield force of the sample and the excitation frequency equal to 95% of the natural frequency of the sample. The differences between the calculated and the measured residual stresses after vibration stress relief process is about 10%. By increasing the applied load frequency to 95% of natural frequency of the sample, longitudinal and transverse residual stresses decreased by more than 55% and about 70%, respectively.

کلیدواژه‌ها [English]

  • Vibration stress relief
  • Residual stress measurement
  • Hole drilling strain gauge method
  • Finite element simulation

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مهندسی ساخت و تولید ایران
دوره 9، شماره 1
فروردین 1401
صفحه 43-53

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