مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تحلیل شکست در شکل‌دهی تدریجی تک‌نقطه‌ای ورق دولایه با استفاده از معیار آسیب نرم

نوع مقاله : پژوهشی اصیل

نویسندگان
1 دانشکده مهندسی مکانیک، دانشگاه صنعتی امیرکبیر (پلی‌تکنیک تهران)، تهران، ایران
2 دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
چکیده
شکل‌دهی تدریجی ورق‌های فلزی یکی از روش‌های نوین شکل‌دهی با انعطاف‌پذیری بالا در تولید هندسه‌های پیچیده و در تیراژ متوسط است. با توجه به عدم حضور قالب مادگی در این فرآیند و اعمال تدریجی نیروهای شکل‌دهی، حد شکل‌پذیری ورق در این فرآیند نسبت به فرآیندهای شکل‌دهی سنتی افزایش می‌یابد. در این پژوهش شکل‌پذیری و شکل‌دهی و در نهایت شکست ورق‌های دولایه آلومینیوم/مس حاصل از روش جوشکاری انفجاری در فرآیند شکل‌دهی تدریجی تک‌نقطه‌ای ورق مطالعه شده است. در پیش‌بینی عددی رشد و شروع شکست ورق‌های دولایه در این فرآیند، از معیار آسیب ژو-ویرزبیکی در قالب زیربرنامه VUMAT نرم‌افزار آباکوس استفاده شد. با استفاده از مدل عددی تغییرات تنش سه‌محوری و کرنش پلاستیک معادل به‌عنوان متغیرهای موثر بر رشد آسیب در فرآیند شکل‌دهی تدریجی تحلیل و تبیین شد و نحوه بارگذاری سیکلی و غیرخطی در این فرآیند نشان داده شد. نتایج تجربی نشان‌دهنده متفاوت‌بودن ارتفاع شکست هندسه‌های مختلف به‌دلیل بروز شرایط بارگذاری متفاوت است. همچنین با استفاده از مدل عددی صحه‌گذاری‌شده، علاوه بر پیش‌بینی محل رشد ترک، ارتفاع شکست در هندسه‌های مختلف شکل‌دهی‌شده با اختلاف ۴/۰۶% نسبت به نتایج تجربی پیش‌بینی شد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Failure Analysis in Single-Point Incremental Forming of Bilayer Sheet Using the Ductile Fracture Criterion

نویسندگان English

A. Zahedi Dizaj Yekan 1
B. Mollaei-Dariani 1
M. Mirnia 2
1 Mechanical Engineering Faculty, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
2 Mechanical Engineering Faculty, Babol Noshirvani University of Technology, Babol, Iran
چکیده English

Incremental forming of metal sheets is one of the new methods of metal forming with high flexibility in batch production of complex geometries. Due to the absence of a matrix and the gradual applying of forming forces, the forming limit in this process is increased compared to conventional ones. In this research, formability, forming, and finally fracture of aluminum/copper bilayer sheets produced by explosive welding method in the single point incremental forming process are studied. In the numerical prediction of growth and onset of fracture of sheets in this process, the Xue-Wierzbicki damage criterion was used as the VUMAT subroutine in Abaqus software. Using the numerical model, variations of the stress triaxiality and equivalent plastic strain as the variables affecting the damage growth in the incremental forming process were analyzed and explained, and the effect of cyclic and nonlinear loading in this process was shown. Experimental results show a different failure height of various geometries due to different loading conditions. Also, using the verified numerical model, in addition to predicting crack growth location, the fracture height in the formed geometries was predicted by 4.06% difference with respect to the experimental results.

کلیدواژه‌ها English

Incremental forming
Damage Criterion
Fracture Height
Bilayer Sheet
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