آنالیز حد شکل‌پذیری ورق‌های فلزی براساس پدیده گلویی موضعی ورتکس و معیار آسیب نرم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، دانشکده مهندسی مکانیک، پردیس دانشگاهی، دانشگاه گیلان، رشت، ایران

2 گیلان*مهندسی مکانیک

3 دانشگاه گیلان*مکانیک

4 عضو هیئت علمی و مدیر گروه مکانیک دانشگاه بین المللی امام خمینی

چکیده

در این مقاله یک روش عددی برای مدلی که توانایی بیان حد شکل‌پذیری ورق‌های فولادی را بر اساس نرخ کرنش، گلویی‌شدن موضعی و آسیب نرم را داشته باشد ارائه شده است. با کاربرد معادله توانی کرنش سختی فلزات که وابسته به نرخ کرنش می‌باشد در تئوری ورتکس، ضمن اینکه پدیده گلویی‌شدن موضعی را می‌توان بررسی کرد اثر نرخ کرنش را نیز می‌توان لحاظ نمود. هدف دیگر این مقاله آنالیز حد شکل‌پذیری ورق‌های فولادی بر اساس معیار آسیب نرم وابسته به حالت تنش است. نتایج مدل عددی ارائه‌شده در زیربرنامه نرم افزار المان محدود آباکوس با نتایج آزمایشگاهی در ورق‌های فولادی ساده کربنی رده 13 و 14 برای اعتبارسنجی مقایسه گردید و مشخص شد که این مدل عددی دارای دقت بسیار بالایی می‌باشد. همچنین بر اساس این نتایج، نمودارهای حد شکل‌دهی ورق‌های فولادی وابسته به نرخ کرنش می‌باشد. به طوری که با افزایش نرخ کرنش سطح نمودارهای حد شکل‌دهی افزایش یافته و این افزایش سطح در نرخ کرنش‌های بالا نسبت به نرخ کرنش‌های پایین قابل‌ملاحظه می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Analysis of Forming Limit of Sheet Metals Considering Vertex Localized Necking and Ductile Damage Criterion

نویسندگان [English]

  • Farid Hosseini Mansoub 1
  • Ali Basti 2
  • aboulfazl darvizeh 3
  • Asghar Zajkani 4
1 Mechanical Faculty, University Campus 2, University of Guilan, Rasht, Iran
2 Mechanical Faculty, University of Guilan, Rasht, Iran
3 Mechanical Faculty, University of Guilan, Rasht, Iran
4 Mechanical Engineering Department, Imam Khomeini International University
چکیده [English]

In the present paper, a predictive strain-rate-dependent model of localized necking is developed by using a modified Vertex theory. A novel ductile damage-based criterion is proposed to control the necking parameters including on stress triaxiality, strain hardening exponent, and Lode parameters. As a characterization parameter, elastic modulus is eventually chosen to measure the ductile damage during the process of plastic deforming. Furthermore, a vectorized user-defined material subroutine is developed to finite element simulation by ABAQUS software, according to original formulations, to create a linkage between related essential models. A typical strain rate-dependent metal is selected to validate the modified Vertex theory. To examine the accuracy of the results from the present simulated study, the applicability is considered to compare with the experimental results. Tests of forming are also performed for steel 13 and steel 14 sheets to measure forming limit diagram. It should be noted that the simulated forming limit diagrams are in good agreement with the experimental data. However, this correlation at low strain rates is better than high strain rates. However, this increase will be infinitesimal for the lower strain rates as compared to the higher ones.

کلیدواژه‌ها [English]

  • Ductile Damage
  • Stress state
  • Strain Rate
  • Forming limit diagrams
  • Vertex theory
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