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مدل آسیب میکرومکانیکی برای پلاستیسیته مواد به‌منظور پیش‌بینی شکست تحت بارهای برشی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 5، دوره 53، شماره 12، اسفند 1400، صفحه 5679-5702 اصل مقاله (3.35 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2021.19546.7050 | ||
| نویسندگان | ||
| حامد قلی پور1؛ فریدرضا بیگلری* 2؛ کامران نیک بین3 | ||
| 1دانشگاه صنعتی امیرکبیر، دانشکده مهندسی مکانیک، تهران، ایران | ||
| 2صنعتی امیرکبیر*مهندسی مکانیک | ||
| 3Imperial College-مهندسی مکانیک | ||
| چکیده | ||
| در این مقاله به مدل مکانیک آسیب مبتنی بر میکرومکانیک جی‌تی ان جهت اضافه کردن قابلیت پیش‌بینی و محاسبه آسیب تحت بارهای برشی پرداخته‌شده؛ تا از آن به‌منظور مدل‌سازی آسیب و شکست در شرایطی که بارهای برشی و آسیب برشی غالب است استفاده گردد. در توسعه مدل جی‌تی ان، نظر به اینکه آسیب‌های مختلف مفاهیم فیزیکی و اثرات تضعیف متفاوتی دارند لذا یک پارامتر آسیب برشی مستقل و مجزا به‌عنوان تابعی از کرنش پلاستیک معادل ماتریس ارائه گردید. مدل آسیب جی‌تی ان اصلاح‌شده با توسعه کد در محیط نرم‌افزار آباکوس پیاده‌سازی شد. جهت آنالیز آسیب با مدل جدید، 16 پارامتر ورودی مدل برای ماده تعیین گردید. پس از توسعه مدل، توسعه کد و تعیین پارامترهای ورودی، ابتدا مدل اصلاح‌شده بر روی تک المان آزمایش شد. بررسی نتایج نشان داد که جواب‌های مدل توسعه داده‌شده مطابقت کاملی با نتایج مدل جی‌تی ان پایه و روابط تحلیلی به ترتیب تحت بارگذاری‌های کششی و برشی دارد. درنهایت مدل توسعه داده‌شده در بارگذاری برشی و روی نمونه برشی مورد آزمایش قرار گرفت. مشاهده گردید مدل اصلاح‌شده تحت بارگذاری برشی ضعف مدل جی‌تی ان پایه را رفع کرده و به‌خوبی بروز آسیب و تضعیف خواص مکانیکی ماده را تحت شرایط برشی حاکم پیش‌بینی می‌کند. | ||
| کلیدواژه‌ها | ||
| مکانیک آسیب؛ مدل جی‌تی ان؛ تابع تسلیم؛ آسیب برشی؛ بارگذاری برشی | ||
| عنوان مقاله [English] | ||
| Micromechanical Damage Model for Plasticity of Metals to Predict Failure under Shear Loads | ||
| نویسندگان [English] | ||
| Hamed Ghoolipour1؛ FaridReza Biglari2؛ Kamran Nikbin3 | ||
| 1Amirkanir University of Technology, Mechanical Engineering Department, Tehran, Iran | ||
| 3Imperial College-مهندسی مکانیک | ||
| چکیده [English] | ||
| The present work deals with the Gurson-Tvergaard-Needleman micromechanics based damage model to add the ability to predict damage under shear loads and use it in modeling damage and failure under shear dominated loading conditions. In the development of the Gurson-Tvergaard-Needleman model, since different damages have different physical concepts and attenuation effects, so an independent shear damage parameter was presented as a function of an equivalent plastic strain of the matrix. The modified Gurson-Tvergaard-Needleman damage model was implemented by developing a code in the Abaqus software. To use the modified Gurson-Tvergaard-Needleman model, 16 input parameters of the model were determined for the material under study. After modifying the model, developing the code, and determining the input parameters, it was first tested on a single element. The results of the developed model showed complete agreement with the results of the basic Gurson-Tvergaard-Needleman model and analytical solutions under tensile and shear loads, respectively. Finally, the developed model was tested in shear loading on the shear specimen. It was observed that the modified model eliminates the weakness of the base Gurson-Tvergaard-Needleman model and well predicts the occurrence of damage and weakening of the mechanical properties of the material under the prevailing shear conditions. | ||
| کلیدواژه‌ها [English] | ||
| Damage mechanics, Gurson-Tvergaard-Needleman model, Yield function, Shear damage, Shear loading | ||
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| مراجع | ||
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