مدلسازی کریستال پلاستیسیته رچتینگ در ریزساختار آلیاژ منیزیم تحت بارگذاری تنش- کنترل سیکلیک کششی با تنش میانگین غیرصفر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشکده مهندسی مکانیک دانشگاه سمنان، سمنان، ایران و کارشناس شرکت تحقیق، طراحی و تولید موتور ایران‌خودرو (ایپکو)، تهران، ایران

2 دانشیار، دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان، ایران

چکیده

امروزه به دلیل نیاز به کاهش وزن خودرو برای کاهش مصرف سوخت و آلایندگی، یکی از گزینه­ های مدنظر طراحان استفاده از آلیاژهای سبک منیزیم، تحت بارگذاری­ های سیکلیک است. در این مقاله، با توجه به ریز ساختار آلیاژ منیزیم AZ91D و ساختار کریستالی آن، مدلی به منظور شبیه ­سازی رفتار رچتینگ این آلیاژ انتخاب شده و نسبت به داده ­های تجربی، صحه ­گذاری شد. برای این منظور، بافت کریستالوگرافی این آلیاژ با توجه به شرایط ساخت و شکل­ دهی آن، تولید شده و به مدل معرفی می­ گردد. نتایج مدلسازی نشان داد که بافت کریستالوگرافی معرفی شده برای 100 کریستال مشابه شکل­ های قطبی آن در آلیاژ منیزیم AZ91D، بعد از فرآیند نورد است. ضمنا مدل ارائه شده، توانایی پیش­ بینی تغییرشکل رچتینگ را دارد اما مقدار کرنش رچتینگ اندکی از بیشتر از داده ­های تجربی، ارزیابی شده است. همچنین، مدل کریستال پلاستیسیته می­تواند با دقت مناسبی، شبیه­ سازی مراحل اولیه و ثانویه رچتینگ، اثرات سخت­ شوندگی، تنش میانگین و دامنه را نشان دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Ratcheting crystal plasticity modeling in microstructure of magnesium alloy under stress-controlled cyclic tensile loading with non-zero mean stress

نویسندگان [English]

  • Adel Basiri 1
  • Mohammad Azadi 2
  • Ahmad Ghasemi-Ghalebahman 2
1 MSc, Faculty of Mechanical Engineering, Semnan University, Semnan, Iran and Expert in Irankhodro Powertrain Company (IPCO), Tehran, Iran
2 Associate Professor, Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
چکیده [English]

Todays, the requirement of lowering the vehicle weight for the reduction of the fuel consumption and emissions, one of the methods considered by designers is to use the ligh magnesium alloy under cylclic loadings. In this article, considering the microstructure of the AZ91D magnesium alloy, its crystalline structure, a model for predicting the ratcheting behavior of this alloy was adapted and verified based on experimental data. The crystallographic texture of this alloy will be introduced into the model respecting the manufacturing process of the shaping conditions. The proposed model, in order to simulate the ratcheting deformation, had an acceptable accuracy. However, the values of the ratcheting strain were over-predicted. Moreover, the crystal plasticity model could simulate the first and second stages of ratcheting, hardening effects, mean stress, and stress amplitude, with a higher accuracy.

کلیدواژه‌ها [English]

  • Microstructural model
  • Crystal plasticity
  • Magnesium alloy
  • fatigue
  • Ratcheting

مراجع

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تحقیقات موتور
دوره 68، شماره 68
مهر 1401
صفحه 39-48

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سابقه مقاله

  • تاریخ دریافت: 15 بهمن 1400
  • تاریخ بازنگری: 29 اردیبهشت 1401
  • تاریخ پذیرش: 29 اردیبهشت 1401

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