علوم و فناوری کامپوزیت

علوم و فناوری کامپوزیت

تحلیل عددی اثر انرژی ضربه بر گسترش آسیب تورق در کامپوزیت‌های گِلِیر

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
2 استاد، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
3 استادیار، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران.
چکیده
آسیب ناشی از ضربه‌های سرعت پایین می‌تواند به طور قابل‌توجهی خواص مکانیکی سازه‌های کامپوزیت‌ فلز-الیاف را تحت‌تأثیر قرار دهد. در این پژوهش، یک مدل عددی مبتنی بر مفاهیم الاستیسیته برای شبیه‌سازی پاسخ کامپوزیت‌های فلز–الیاف تحت بارگذاری ضربه‌ای با سرعت پایین توسعه داده شد. کامپوزیت گِلِیر با آرایش لایه‌ای [Al/0/90/0/90]S تحت سطوح مختلف انرژی ضربه مدل‌سازی و میزان پلاستیسیته در لایه‌های فلزی به همراه آغاز و گسترش آسیب تورق در لایه‌های کامپوزیتی ارزیابی شد. برای مدل‌سازی رفتار الاستوپلاستیک آلیاژ آلومینیوم، از معیار جانسون-کوک و برای پیش‌بینی شروع آسیب تورق در لایه‌های کامپوزیتی از نسخه‌ی اصلاح‌شده‌ی سه‌بعدی معیار هشین استفاده شد. همچنین، گسترش آسیب تورق در لایه‌های‌ کامپوزیتی از طریق کاهش ناگهانی سفتی المان‌ها شبیه‌سازی گردید. برخلاف روش‌های مبتنی بر مکانیک شکست که نیازمند تعریف اولیه مسیر ترک هستند، در این مدل از تغییرات ماتریس سفتی برای شبیه‌سازی آسیب‌ تورق بدون استفاده از المان‌های چسبنده استفاده شد. نتایج نشان داد که با افزایش انرژی ضربه، مساحت آسیب تورق در لایه‌های کامپوزیتی از 1677 میلی‌متر مربع در ضربه 8 ژول به 2249 میلی‌متر مربع در ضربه 18.5 ژول افزایش یافت. مدل عددی توسعه‌یافته توانست روند ایجاد و گسترش آسیب در نمونه کامپوزیت‌ گِلِیر را با دقت مناسبی پیش‌بینی کند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Numerical Analysis of the Effect of Impact Energy on Delamination Propagation in GLARE Composites

نویسندگان English

Amirreza Amirinejad 1
Mahmood M. Shokrieh 2
Siavash Kazemirad 3
1 School of Mechanical Engineering, Iran University of Science and 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

Low-velocity impact damage can significantly affect the mechanical properties of fiber–metal composite structures. In this study, an elasticity-based numerical model is developed to simulate the response of fiber–metal composites under low-velocity impact loading. A GLARE laminate with a [Al/0/90/0/90]S stacking sequence is modeled under different impact energy levels, and plastic deformation in the metallic layers, along with the initiation and propagation of delamination damage in the composite layers, is evaluated. The elastoplastic behavior of the aluminum alloy is modeled using the Johnson–Cook criterion, and the initiation of delamination damage in the composite layers is predicted using a modified three-dimensional Hashin criteria. In addition, the propagation of delamination damage in the composite layers is simulated by instantaneously degrading element stiffness. Unlike fracture-mechanics-based approaches that require predefined crack paths, this model employs stiffness-matrix degradation to simulate delamination damage without using cohesive elements. The results show that, with increasing impact energy, the delaminated area in the composite layers increases from 1677 mm² at 8 J to 2249 mm² at 18.5 J. The developed numerical model predicts the initiation and propagation of damage in the GLARE composite specimen with satisfactory accuracy.

کلیدواژه‌ها English

Fiber-metal laminate (FML)
Low-velocity impact
Delamination
Finite element modeling
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