علوم و فناوری کامپوزیت

مدل‌سازی و بهینه‌سازی پارامترهای موثر بر استحکام کششی و انعطاف‌پذیری کامپوزیت زمینه آلومینیومی حاصل از فرآیند FSA با استفاده از روش RSM

نوع مقاله : مقاله پژوهشی

نویسنده

استادیار، مهندسی مکانیک، دانشکده مهندسی مکانیک و مکاترونیک، دانشگاه صنعتی شاهرود، شاهرو د

چکیده

یکی از روش‌های جدید برای بهبود خواص مکانیکی لایه‌های‌ سطحی، فرآوری اصطکاکی اغتشاشی (FSP) است. در صورتی که فرآیند FSP به همراه یک ماده مصرفی انجام شود، این فرآیند جدید تحت عنوان آلیاژسازی اصطکاکی اغتشاشی (FSA) شناخته می‌شود. از این‌رو در پژوهش پیش‌رو، کامپوزیت‌های سطحی Al7075 با به‌کارگیری ذرات تقویت‌کننده از جنس آلومینا، با استفاده از این فرآیند و منطبق بر اصول طراحی آزمایش، تولید شدند‌. بدین منظور، روش RSM به عنوان روش طراحی آزمایش، انتخاب گردید و متغیرهای: سرعت دورانی ابزار، نرخ پیشروی ابزار، قطر شانه ابزار و اندازه ذرات تقویت‌کننده به عنوان متغیرهای ورودی فرآیند، تعیین شدند. نتایج حاصل از آنالیز واریانس و تحلیل رگرسیون داده-های حاصل از آزمون‌های تجربی، صحت و دقت معادلات رگرسیون را مورد تأیید قرار داد و نشان داد که نرخ پیشروی ابزار، قطر شانه ابزار و اندازه ذرات تقویت‌کننده با تأثیرات خطی و مرتبه دوم، بر استحکام کششی و انعطاف‌پذیری نمونه‌های کامپوزیتی موثر هستند. همچنین، در صورتی که سرعت دورانی ابزار در مقدار 800 rpm تنظیم شود، افزایش قطر شانه ابزار از 9 mm به15 mm باعث افزایش 17.97 درصدی استحکام کششی نمونه‌های کامپوزیتی می‌شود. علاوه بر این، کاهش نرخ پیشروی ابزار از 60 mm/min به 20 mm/min و کاهش اندازه ذرات آلومینا از 50 میکرون به 20 میکرون، به ترتیب موجب افزایش انعطاف‌پذیری نمونه‌های کامپوزیتی به میزان 1.85 % و 5.04 % می‌شود. در پایان، با دستیابی به مقدار بیشینه تابع مطلوبیت (0.915)، شرایط بهینه‌ متغیرهای ورودی فرآیند تعیین شد و با اجرای آزمون صحه‌گذاری، به تأیید رسید.

کلیدواژه‌ها

عنوان مقاله [English]

Modelling and optimization of parameters affecting the tensile strength and ductility of aluminum-based composite produced by FSA via RSM

نویسنده [English]

  • Mahdi Vahdati

Faculty of Mechanical and Mechatronics Engineering, Shahrood University of Technology, Shahrood, Iran.

چکیده [English]

One of the new methods to improve the mechanical properties of surface layers is the friction stir processing (FSP). If the FSP process is carried out with a consumable material, this new process is known as the friction stir alloying (FSA). Therefore in this research, the Al7075 surface composites by using reinforcing particles (Al2O3) were produced based on this process in accordance with the DOE approach. So, the RSM was selected as the experiment design method and variable factors such as: tool rotational speed, tool feed rate, tool shoulder diameter and size of reinforcing particles were determined as the input variables. The results of ANOVA and regression analysis of experimental data approved the accuracy of regression equations and showed that the tool feed rate, tool shoulder diameter and size of reinforcing particles with linear and second-order effects, affect on the tensile strength and ductility of the composite specimens. Also, if the tool rotational speed is set at 800 rpm, increasing the tool shoulder diameter from 9 mm to 15 mm will increase the tensile strength of the composite specimens by 17.97%. In addition, lowering the tool feed rate from 60 mm/min to 20 mm/min and reducing the size of alumina particles from 50 micron to 20 micron, will increase the ductility of composite specimens by 1.85% and 5.04%, respectively. Finally, by achieving maximum value of desirability function (0.915), the optimal condition of input variables was determined. In addition, the optimal condition has been confirmed by implementing the verification test.

کلیدواژه‌ها [English]

  • Optimization
  • Surface composite
  • Tensile strength
  • Ductility
  • Friction stir alloying
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علوم و فناوری کامپوزیت
دوره 7، شماره 4
اسفند 1399
صفحه 1207-1216
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هم رسانی
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