نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشیار، آزمایشگاه پژوهشی سازههای پیشرفته، دانشکده مهندسی هوافضا، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران
2 فارغ التحصیل کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
3 استاد، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
چکیده
در این مقاله، ابتدا روند مدلسازی تورق ناشی از فرآیند دریل‌کاری سنتی با مته دریل پیچشی در چندلایه‌های کامپوزیتی در بستر اجزاء محدود، شرح داده شده و نتایج دریل‌کاری در یک چندلایه بررسی می‌گردد. سپس رفتار مکانیکی این چندلایه حاوی تورق، تحت بارگذاری تک محوری مورد مطالعه قرار گرفته و نتایج تحلیل حاضر با ادبیات موجود مورد مقایسه قرار می‌گیرد. برای این تحلیل، ویژگی‌ها و رفتار مکانیکی و استحکامی لایه‌های کامپوزیت به ترتیب با نگارش قوانین ساختاری مواد ناهمسانگرد و معیار آسیب هاشین، در قالب زیرروال وی یومت در نرم افزار آباکوس به لایه‌ها اختصاص داده می‌شود. به منظور پایش پدیده تورق، بین لایه‌ها از المان‌های چسبندۀ تابع قانونِ کشش- جدایش دو خطی استفاده می‌شود. بین نتایج تحلیل اجزاء محدود حاضر و نتایج پژوهش‌های پیشین تطابق خوبی برقرار است. در ادامه، رفتار چندلایه کامپوزیتی سوراخدار حاوی تورق اولیه ناشی از دریل‌کاری، تحت بار کششی و فشاری مورد بررسی قرار می‌گیرد. نتایج نشان می‌دهد در حالتی که تورق اولیه در اطراف سوراخ اعمال شود، نسبت به حالتی که صفحه سوراخدار بدون توجه به تورق اولیه تحلیل شود، استحکام کششی و فشاری قطعه به ترتیب به طور میانگین به میزان5.5 و 19.5درصد کاهش یافته است. هر چه اندازه ناحیه تورق بیشتر باشد، افت استحکام نیز بیشتر خواهد بود.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Modeling and analysis of mechanical behavior of drilled laminated composites subjected to tensile and compressive loads
نویسندگان [English]
- Mahnaz Zakeri 1
- Hadi Ghesmati-Kucheki 2
- Majid Reza Ayatollahi 3
1 Advanced Structures Research Laboratory, Aerospace Engineering Department, K. N. Toosi University of Technology, Tehran, Iran.
2 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.
3 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.
چکیده [English]
In this paper, first, the process of modeling the delamination due to the traditional drilling process with twist bit in composite laminates in the finite element bed has been described and the drilling results in a laminate have been investigated. Then, the mechanical behavior of this laminate containing the delamination was studied under uniaxial loading and the results of the analysis were compared with the literature. For this analysis, the mechanical and strength properties and behavior of the composite layers were assigned by writing the structural laws of anisotropic materials and the Hashin damage criterion, respectively, in the form of VUMAT subroutine in ABAQUS software. To monitor the delamination phenomenon, cohesive elements between the layers were used based on the bilinear traction-separation law. There was a good agreement between the results of the present finite element analysis and the previous researches. In the following, the behavior of drilled composite laminate containing primary drilling-induced delamination under tensile and compressive loads was investigated. The results show that in the case where the initial delamination was applied around the hole, the tensile and compressive strength of the laminate decrease by 5.5 and 19.5 percent on average, respectively, compared to the case where the drilled plate was analyzed regardless of the initial delamination. The larger the delamination area, the greater the strength drop
کلیدواژه‌ها [English]
- Laminated composites
- drilling
- delamination
- uniaxial loading
- finite element analysis
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