مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

ارزیابی خواص الاستیک و پلاستیک ورق آلومینیوم تولیدشده با فرآیند پیوند سردنوردی به روش همبستگی تصاویر دیجیتال

نوع مقاله : پژوهشی اصیل

نویسندگان
1 گروه مهندسی مکانیک، پردیس دانشکده‌های فنی، دانشگاه تهران، تهران، ایران
2 گروه مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران
چکیده
فرآیند پیوند سردنوردی، یک فرآیند جوشکاری حالت جامد برای اتصال فلزات هم‌جنس و غیرهم‌جنس است. استفاده از مواد تولیدشده به روش پیوندنوردی برای کاربردهای مختلف و پیش‌بینی رفتار آنها در نرم‌افزارهای شبیه‌سازی نیازمند شناسایی کامل و دقیق خواص مکانیکی ماده است. همبستگی تصاویر دیجیتالی یک روش قدرتمند و غیرتماسی برای اندازه‌گیری میدان تغییرشکل ماده است. اخیراً روش همبستگی تصاویر دیجیتال توسعه یافته و به‌طور گسترده در تحقیقات مختلف استفاده می‌شود. در این تحقیق، ورق دولایه آلومینیوم آلیاژی 1050 با استفاده از روش پیوندنوردی با اعمال کاهش ضخامت 50% در دمای محیط تولید و سپس از روش همبستگی تصویر دیجیتال دوبعدی برای به‌دست‌آوردن توزیع کامل میدان کرنش طی آزمون کشش تک‌محوره در جهت نورد استفاده شد. کرنش در دو جهت طول و عرض با روش همبستگی تصاویر دیجیتال و کرنش در راستای ضخامت، کرنش موثر و ضریب ناهمسانگردی با استفاده از روابط پلاستیسیته محاسبه شد. علاوه بر این برای اولین بار با استفاده از روش میدان مجازی، ثوابت الاستیک و پلاستیک نظیر مدول الاستیسیته، نسبت پواسون، ضریب استحکام، توان کارسختی و تنش تسلیم محاسبه شد. نتایج نشان داد که به‌دلیل کارسختی و افزایش چگالی نابه‌جایی مقدار استحکام و میکروسختی شدیداً افزایش و ازدیاد طول و توان کارسختی کاهش یافت. استحکام برای آلومیینوم دولایه به MPa113 رسید که نسبت به آلومینیوم اولیه بیش از سه برابر بهبود یافته است. همچنین تغییرات پارامترهای الاستیک بسیار اندک بوده و مدول الاستیسیته برای آلومینیوم اولیه و دولایه، به‌ترتیب GPa70 و 69/3 به‌دست آمد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Characterization of the Plastic and Elastic Properties of Aluminum Sheet Produced by CRB Process via DIC Method

نویسندگان English

D. Rahmatabadi 1
A. Shahmirzaloo 1
M. Farahani 1
R. Hashemi 2
1 Mechanical Engineering School, Engineering College, University of Tehran, Tehran, Iran
2 Mechanical Engineering Department, Iran University of Science and Technology, Tehran, Iran
چکیده English

The cold roll bonding (CRB) is a solid state welding process for bonding similar and dissimilar metals. The use of materials produced by the CRB method for different applications and the prediction of their behavior in simulation software requires the complete and accurate identification of their mechanical properties. Digital image correlation (DIC) is a powerful non-contact method for measuring the field of material deformation. Recently, the DIC method has been developed and widely used in various studies due to its advantages. In this research, two-layered aluminum alloy 1050 was produced via CRB process with applying 50% reduction of thickness at ambient temperature and then using the 2D-DIC system to extract distribution of the strain field during the uniaxial tensile test at rolling direction. Strain in two directions of length and width was calculated, using DIC and strain in terms of thickness, effective strain, and anisotropy coefficient, using plasticity relationships. Moreover, for the first time, using the virtual field methods (VFM), elastic and plastic parameters such as elastic modulus, Poisson ratio, strength coefficient, strain hardening exponent, and yield stress were calculated. The results showed that the strength and microhardness were significantly increased due to the work hardening and increasing the density of dislocations, and the elongation and strain hardening exponent were reduced. The strength for the two-layered aluminum was 113MPa, which improved more than three times of the initial aluminum. Also, changes in the elastic parameters were very small and the modulus of elasticity for the primary aluminum and two-layered aluminum was 69.3 and 70GPa, respectively.

کلیدواژه‌ها English

CRB Process
DIC Method
Elastic and Plastic Properties
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