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بررسی رفتار میکرومکانیکی فولاد فریتی-مارتنزیتی تحت بارگذاریهای پیچیده | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 16، دوره 53، شماره 6، شهریور 1400، صفحه 3689-3702 اصل مقاله (2.52 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2021.18782.6889 | ||
| نویسندگان | ||
| علی چلوئی دارابی1؛ علی پورکمالی انارکی* 2؛ جواد کدخداپور3؛ زیگفرید اشمودر4 | ||
| 1دانشکده مهندسی مکانیک دانشگاه تربیت دبیر شهید رجائی | ||
| 2دانشکده مهندسی مکانیک، دانشگاه شهید رجایی، تهران، ایران | ||
| 3مهندسی مکانیک، دانشگاه تربیت دبیر شهید رجایی | ||
| 4موسسه IMWF، دانشگاه اشتوتگارت، اشتوتگارت، آلمان | ||
| چکیده | ||
| در این مقاله رفتار مکانیکی فولاد دوفازی فریتی-مارتنزیتی با استفاده از روش های عددی و آزمایشگاهی در ابعاد ماکرو و میکرو مورد بررسی قرار گرفته است. به منظور بررسی اثر حالت تنش بر رفتار شکست ماده، چهار نمونه آزمایشگاهی تحت حالتهای مختلف تنش تست شدهاند. پس از تصویربرداری از ریزساختار ماده با استفاده از میکروسکوپهای نوری، با استفاده از کد پردازش تصویر و کد اجزاء محدود نوشتهشده به ترتیب در نرمافزارهای تجاری متلب و آباکوس، سلول واحد سهبعدی براساس ساختار واقعی ماده، مدل شده است. سپس توانایی مدل میکرومکانیکی پیشنهادشده، با مقایسه نتایج مدل سازی عددی با رفتار ماکرومکانیکی بدستآمده از آزمونهای تجربی تحت حالتهای مختلف تنش، مورد ارزیابی قرار گرفته شد. نتایج نشان میدهد که مدل میکرومکانیکی قابلیت پیش بینی منحنی تنش-کرنش تحت حالتهای مختلف تنش، به غیر از حالت برش، را دارد. درنهایت با استفاده از مدل میکرومکانیک پیشنهادشده، به بررسی اثر پارامترهای حالت تنش بر روی نسبت سهمبندی تنش-کرنش و کرنش محلی پلاستیک در لحظه شکست پرداخته شد که نتایج نشان میدهد که این مقادیر کاملا وابسته به ضرایب حالت تنش می باشند. | ||
| کلیدواژهها | ||
| فولاد دوفازی؛ مدلسازی میکرومکانیکی؛ حالت تنش؛ سهمبندی تنش-کرنش؛ محلیسازی کرنش پلاستیک | ||
| عنوان مقاله [English] | ||
| Investigation of the micromechanical behavior of ferritic-martensitic steel under complex loading | ||
| نویسندگان [English] | ||
| Ali Cheloee Darabi1؛ Ali Pourkamali Anaraki2؛ Javad Kadkhodapour3؛ Siegfried Schmauder4 | ||
| 1Department of Mechanical Engineering, Shahid Rajaee Teacher Training University | ||
| 2Mechanical Engineering Department, Shahid Rajaee University, Tehran, Iran | ||
| 3a Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran | ||
| 4Institute for Materials Testing, Materials Science and Strength of Materials, University of Stuttgart, Pfaffenwaldring 32, 70569, Stuttgart, Germany | ||
| چکیده [English] | ||
| In this paper, the mechanical behavior of dual phase steel has been investigated in the macro and micro scales as experimentally and numerically. In order to study the influence of stress states on the mechanical behavior and fracture strain of DP600, four different specimens were tested under different stress states. Afterward, the obtained microstructure images by light microscope, were utilized to generate a 3D representative volume element based on the real microstructure. The microstructure images were converted to a 3D RVE model by image processing and finite element codes in Matlab and Abaqus commercial software, respectively. Then, the ability of the micro mechanical model to predict the macro mechanical behavior was evaluated under different stress states. The results demonstrate the micro mechanical model is able to predict the macro mechanical flow curve under different stress states except for shear. Finally, the influence of stress states on the stress to strain partitioning rate and the local plastic strain at fracture point were assessed. The results show stress-strain partitioning and local plastic strain are strongly dependent on stress state. | ||
| کلیدواژهها [English] | ||
| Dual phase steel, Micromechanical modeling, Stress state, Stress-strain partitioning, Plastic strain localization | ||
| مراجع | ||
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