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بررسی چقرمگی شکست نانوکامپوزیتهای B4C-TiB2 با روش تست فرورفتگی ویکرز در بارگذاریهای مختلف | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 6، دوره 46، شماره 2، اسفند 1393، صفحه 57-65 اصل مقاله (1.24 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2015.350 | ||
| نویسندگان | ||
| حمید رضا بهاروندی1؛ مهدی تاجداری2؛ علیرضا مرادخانی* 3 | ||
| 1دانشیار، دانشکده مهندسی مواد، دانشگاه صنعتی مالک اشتر، تهران | ||
| 2استاد، دانشکده مهندسی مکانیک، دانشگاه آزاد اسلامی، واحد اراک | ||
| 3کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه آزاد اسلامی، واحد شرق تهران | ||
| چکیده | ||
| با توجه به گستردگی و کارایی روز افزون سرامیکها در صنایع مختلف، نیاز به شناسایی دقیق خواص مکانیکی آنها با حداقل صرف زمان و هزینه جهت طراحی بهینه مهم می‌‌باشد. در این پژوهش با ساخت نمونه‌‌های نانوکامپوزیتB4C با ده درصد حجمی دی‌‌بورید تیتانیوم، مقادیر دانسیته، مدول الاستیسیته و سختی آنها تعیین و مقدار چقرمگی شکست آنها توسط روابط مختلف تعیین چقرمگی شکست به روش تست فرورفتگی ویکرز در بارگذاریهای N100 و N150 بدست آمده و نتایج آن با یکدیگر مقایسه شدند. نتایج حاصل دقت و کارایی معادله اصلاح شده تعیین چقرمگی شکست با استفاده از سطح اثر ترک در مقایسه با دیگر روابط را در پی داشت. همچنین مکانیزم رشد ترکهای ناشی از بارگذاریهای مختلف در نتایج حاصل از معادلات چقرمگی شکست اثر گذار بود. | ||
| کلیدواژه‌ها | ||
| چقرمگی شکست؛ نانوکامپوزیت؛ روش فرورفتگی؛ دی بورید تیتانیوم؛ کاربیدبور | ||
| عنوان مقاله [English] | ||
| Study of fracture toughness in B4C-TiB2 Nanocomposites with Vickers indentation test method at different loads | ||
| نویسندگان [English] | ||
| Hamidreza Baharvandi1؛ mehdi tajdari2؛ Alireza Moradkhani3 | ||
| چکیده [English] | ||
| According to widespread and increasing efficiency of ceramics in different industries, identification their mechanical properties with minimum time and cost is important for the optimal design. In this paper, B4C nanocomposite samples with a volume of 10% of TiB2were prepared and the values of density, hardness and Elasticity modulus were determined and then the fracture toughness values were calculated by using various fracture toughness formula with Vickers indentation test method in loads of 100N and 150N and their results were compared to each other. The results show that the modified equation with using cracks leads high accuracy and efficiency compared to other relations. It also concluded that the growth mechanism due to different loads affects on the results of fracture toughness values. | ||
| کلیدواژه‌ها [English] | ||
| Fracture Toughness, Nanocomposite, Indentation method, Titanium Diborid, boron carbide | ||
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| مراجع | ||
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