طراحی و ساخت مخزن تحت‌فشار سه‌لایه با استفاده از فرایند شرینک فیت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پژوهشگر، مرکز مواد پیشرفته و نانوفناوری، دانشگاه جامع امام حسین (ع)، تهران، ایران

2 استادیار، گروه مهندسی مکانیک، دانشگاه جامع امام حسین (ع)، تهران، ایران

3 دانشیار، گروه مهندسی مواد، دانشگاه جامع امام حسین (ع)، تهران، ایران

چکیده

یکی از روش‌های افزایش مقاومت در برابر شکست و افزایش عمر خستگی در مخازن تحت­ فشار جدار­ ضخیم، ایجاد تنش پسماند فشاری در سطح آن است. یکی از این روش‌ها، فرایند شرینک فیت و یا انطباق تداخلی است. در این مقاله عملیات شرینک ­فیت برای ساخت مخزن سه لایه­‌ی کوره‌ی پرس ایزو­استاتیک داغ با استفاده از شبیه‌سازی المان محدود و روش تحلیلی مورد بررسی قرار گرفت. تنش‌های به وجود آمده در اثر فرایند شرینک فیت در مخازن با استفاده از محاسبات تحلیلی و شبیه‌سازی المان محدود بررسی شد. برای انجام ‌شرینک فیت به‌صورت تجربی، سه عدد مخزن از جنس فولاد VCN150 ساخته شد و عملیات شرینک فیت با موفقیت انجام گردید. بر اساس نتایج به‌دست‌آمده از شبیه‌سازی، بیشترین جابجایی شعاعی برای مخزن بیرونی 89/0 میلی‌متر و مقدار تنش پسماند به وجود آمده 9/39 مگاپاسکال است. مقایسۀ نتایج به‌دست‌آمده از شبیه‌­سازی و محاسبات تحلیلی برای مخزن میانی و مخزن بیرونی نشان می‌دهد مقدار اختلاف بین نتایج شبیه‌سازی و حل تحلیلی برای مخزن میانی و بیرونی­‌ترین مخزن به ترتیب 3/2% و 8/2% است.

کلیدواژه‌ها

عنوان مقاله [English]

Design and manufacturing of three layer pressure vessel by Shrink fit process

نویسندگان [English]

  • Amir Naseroleslami 1
  • Hadi Eivazi Bagheri 1
  • Seyyed Mohammad Vahab Mousavi 2
  • Salman Seyyed Afghahi 3
1 Advanced Materials and Nanotechnology Research Center, Imam Hossein University, Tehran, Iran
2 Department of Mechanical Engineering, Imam Hossein University, Tehran, Iran
3 Department of Material science, Imam Hossein University, Tehran, Iran
چکیده [English]

Induction of compressive residual stress on the surface thick-walled cylinder is a way to increase the resistance to failure and increase the fatigue life. The shrink-fit process is one of these methods. In this paper, the three-layer shrink fit for the construction of the hot isostatic press cylinders has been analyzed using experiments, analytical modeling, and finite element simulation. The stresses created due to the shrink fit process in cylinders were investigated using analytical calculation and finite element simulation. To perform the shrink fit experimentally, three cylinders were made of VCN steel and the shrink fit operation was performed. Based on the results from the finite element simulation, the maximum radial displacement for the outer cylinder is 0.89 mm and the residual stress value is 39.9 MPa. Also, the comparison of simulation results and analytical method for the middle and outer cylinder shows that the differences were 2.3% and 2.8%, respectively.

کلیدواژه‌ها [English]

  • Shrink Fit
  • Hot Isostatic Press
  • Finite Element Method
  • Residual Stress

مراجع

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