علوم و فناوری کامپوزیت

ارزیابی تغییرات در خصوصیات مکانیکی چندلایه های کامپوزیتی از جنس شیشه/وینیل استر تحت بار خمشی با کمک آنالیز خرابی پیشرونده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، مهندسی عمران و محیط زیست، دانشگاه امیرکبیر، تهران، ایران

2 استاد، مهندسی عمران و محیط زیست، دانشگاه امیرکبیر، تهران، ایران

3 استاد، مهندسی هوافضا، دانشگاه امیرکبیر، تهران، ایران

چکیده

در این مقاله تغییرات مدول الاستیسیته و مقاومت نهایی چندلایه ها با استفاده از مدل های المان محدود شبیه سازی شده از نمونه های آزمایشگاهی برای چندلایه های کامپوزیتی از جنس شیشه/وینیل استر مورد آزمایش و بررسی واقع شد. با استفاده از مدل های المان محدود دارای المان های سه بعدی با قابلیت خرابی پیشرونده و همچنین با تعریف دقیق رابطه تماس بین تیر و تکیه گاه، تاثیر رفتار غیرخطی مواد و هندسه در رفتار خمشی تیرها شبیه سازی شد. در ابتدا آزمایشات کشش به منظور ملاحظه رفتار خرابی پیشرونده در چندلایه ها و تصدیق مدلسازی خرابی انجام شده و شبیه سازی گردید. در ادامه با اجرای تست های خمش سه نقطه ای و سپس شبیه سازی تیرها، تغییر مدول الاستیسیته خمشی با مقایسه نمودارهای بار-تغییرمکان بدست آمده از آزمایشات و مدل های المان محدود اندازه گیری شد. برای پیشگویی خرابی از معیارهای بر پایه کرنش به جای معیارهای بر پایه تنش استفاده شد. با داشتن کرنش های خرابی ثابت برای نمونه های کششی و خمشی و از طرفی تغییر مدول الاستیسیته برای لایه چینی های مختلف چندلایه ها، تغییر مقاومت نهایی تجربه شده برای نمونه ها تحت بار خمشی تعیین شد. با توجه به وابسته بودن تغییر مدول الاستیسیته چندلایه های کامپوزیتی به عملکرد فاز پلیمری ماده، این تغییر به عملکرد لایه های ˚90 در چندلایه های با لایه چینی های مختلف نسبت داده شد و در انتها نموداری برای تغییر مدول الاستیسیته لایه های ˚90 مربوط به لایه چینی های مختلف ارائه شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of variation in the mechanical properties of composite laminates using progressive failure analysis

نویسندگان [English]

  • Alireza Nazari 1
  • Mohammad Zaman Kabir 2
  • Hossein Hosseini Toudashki 3

1 Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran

2 Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran

3 Department of Aerospace Engineering, Amirkabir University of Technology, Tehran, Iran

چکیده [English]

In this paper, the performance of some glass/vinylester composite laminates was examined. Using 3D FE models for the specimens and progressive failure analysis of the models, an accurate simulation of the contact between the composite beam and the supports was implemented. Also the influence of material and geometric non-linearity on the flexural load carrying behavior of the beams was investigated. At the first, the tension experiments were conducted for observation of the progressive failure behavior in the composite laminates and verification of the failure model. In the following, by implementing the three-point-bending tests and then simulation of the composite beam specimens, varaition of the flexural modulus was investigated by the aid of comparing the load-deflection curves obtained by the experiments and the FE models. For prediction of the failure, the strain-based failure criteria were used rather than the stress-based failure criteria. Since the failure strains were identical for tensile and bending specimens, variation of the flexural modulus led in variation of the flexural strength. As variation of the flexural modulus was considered dependent on the performance of the polymeric phase of the composite laminates, this variation was attributed to the performance of the 90˚ layers.

کلیدواژه‌ها [English]

  • Composite beam
  • Flexural Strength
  • Flexural modulus
  • Progressive failure
مراجع
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علوم و فناوری کامپوزیت
دوره 5، شماره 1
خرداد 1397
صفحه 51-60
فایل ها
هم رسانی
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