بررسی تجربی و شبیه‌سازی تغییر شکل مومسان صفحات دوقطبی فلزی با الگوی شیار موازی مارپیچ

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک دانشگاه تربیت مدرس

2 آزمایشگاه تحقیقاتی فناوری پیل‌سوختی، دانشگاه صنعتی مالک اشتر

چکیده

در این پژوهش، تغییر شکل مومسان صفحات دوقطبی فلزی با الگوی شیار مارپیچ در فرایند مهرزنی مورد بررسی قرار گرفت. مسیر کرنش و توزیع ضخامت در صفحات دوقطبی فلزی از جنس فولاد زنگ‌نرن 304 با ضخامت 1/0 میلی‌متر تعیین شدند. بدین منظور، شبیه‌سازی فرایند توسط نرم‌افزار اجزای محدود انجام شد. صحت نتایج به کمک مقایسه منحنی توزیع ضخامت و نیرو-جابجایی تجربی و شبیه‌سازی مورد بررسی قرار گرفت که به ترتیب بیانگر 76/4 و 85/3 درصد خطا می‌باشند. با توجه نتایج بدست‌آمده، جریان ورق تاثیر متفاوتی بر توزیع ضخامت در کانال‌های داخلی و بیرونی خواهد داشت و درصد نازک‌شدگی کانال‌های میانی در راستاهای طولی، قطری و عرضی، بیشتر از کانال‌های کناری می‌باشد. بیشترین درصد نازک‌شدگی (ناحیه بحرانی) در کانال‌های میانی واقع بر راستای طولی (33 درصد در دیواره کانال) ایجاد می‌شود در حالی که راستای قطری، راستای بحرانی برای کانال‌های کناری می‌باشد. به دلیل ایجاد مسیر کرنش کشش دومحوره در راستای قطری، برخلاف سایر راستاها کاهش ضخامت قابل توجهی هم در دیواره کانال و هم در کف کانال صفحات دوقطبی فلزی مشاهده می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental and numerical investigation of the plastic deformation of metallic bipolar plates with serpentine flow filed

نویسندگان [English]

  • Hossein Talebi-Ghadikolaee 1
  • Mohammad Mahdi Barzegari 2
1 Faculty of Mechanical Engineering, Tarbiat Modares University
2 Fuel cell Technology Research laboratory, Malek Ashtar University of Technology
چکیده [English]

In this study, plastic deformation of the metallic bipolar plate with serpentine flow field was investigated during stamping process. Strain path and thickness distribution in 304 stainless steel bipolar plate with the thickness of 0.1 mm were determined. To this aim, the process was simulated by the commercial finite element code. The validity of the result was evaluated by comparing the experimental and numerical thickness distribution and force-displacement curve which represent 4.76 and 3.85% prediction error, respectively. According to the results, flow of the material has significant effect on the thickness distribution of the central and lateral channels, and the thickness reduction percentage of the central channel in longitudinal, diagonal and transverse direction is much more than that of lateral one. Maximum thickness reduction (critical area) in central channels is placed in longitudinal direction (33% at channel side) while the diagonal direction is considered as critical direction for lateral channels. Due to the existence of the equibiaxial tension strain path in diagonal direction, significant thickness reduction is observed in both the side and the rib zone of the channels.

کلیدواژه‌ها [English]

  • Fuel Cell
  • Metallic bipolar plate
  • metal forming
  • Thickness distribution
  • strain path
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