نشریه فناوری آزمون‌های غیرمخرب

نشریه فناوری آزمون‌های غیرمخرب

بررسی گسترش ترک مود اول در تیرهای خمیده کامپوزیتی ساخته‌شده به روش پیچش رشته‌ای با استفاده از تکنیک گسیل آکوستیکی

نوع مقاله : مقاله پژوهشی

نویسنده
دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی، واحد تهران شرق، تهران، ایران
چکیده
یکی از روش‌های متداول صنعتی برای ساخت سازه‌های کامپوزیتی، پیچش الیاف است که به‌طور گسترده برای تولید قطعات محور-متقارن به کار می‌رود. این فرآیند به دلیل توانایی آن در ایجاد ساختارهای سبک و مقاوم، به ویژه در صنایع هوافضا و خودروسازی، بسیار محبوب است. یکی از رایج‌ترین مکانیزم‌های آسیب در این سازه‌های کامپوزیتی، لایه‌لایه‌شدگی است که تحت انواع مختلف بارگذاری رخ می‌دهد. این پدیده می‌تواند منجر به کاهش قابل توجهی در عملکرد و عمر مفید سازه شود. در این پژوهش، رفتار مکانیکی و گسترش ترک اولیه مد اول در تیرهای منحنی کامپوزیت کربن/اپوکسی ساخته‌شده به روش پیچش الیاف (FW) با استفاده از روش انتشار آکوستیکی (AE) مورد بررسی قرار گرفته است.

برای این منظور، در ابتدا یک لوله کامپوزیتی با در نظر گرفتن جدایش بین‌لایه‌ای مصنوعی ساخته شد و نمونه‌های تیر از امتداد طولی آن برش داده شدند. در گام نخست، آغاز شکست‌ها با استفاده از روش AE تعیین شد. سپس، رشد و گسترش لایه‌لایه‌شدگی بین‌لایه‌ای از طریق انرژی سیگنال‌های AE و تابع سنتری مورد ارزیابی قرار گرفت. با تعیین سرعت امواج AE و ارائه روشی برای فیلتر کردن سیگنال‌های ناخواسته، موقعیت لحظه‌ای نوک لایه‌لایه‌شدگی بین‌لایه‌ای در حین رشد پیش‌بینی گردید.

نتایج نشان داد که پدیده پل‌زنی الیاف ناشی از نفوذ دو ناحیه مجاور در سطح جدایش بوده و طول ناحیه پل‌زنی الیاف تأثیر قابل‌توجهی بر چقرمگی شکست مد اول لایه‌لایه‌شدگی دارد. همچنین، با افزایش ناحیه پل‌زنی الیاف، چقرمگی شکست افزایش می‌یابد. در نهایت، تطابق خوبی بین مقادیر چقرمگی شکست به‌دست‌آمده از روش AE و مقادیر حاصل از استاندارد ASTM D5528 مشاهده شد. این نتایج می‌تواند به طراحی بهتر سازه‌های کامپوزیتی و پیش‌بینی رفتار آن‌ها در شرایط بارگذاری واقعی کمک کند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigation of Mode-I Crack Propagation in Filament-Wound Composite Curved Beams Using Acoustic Emission Technique

نویسنده English

Mehdi Farajpour
Department of Engineering, Islamic Azad University, East Tehran Branch, Tehran, Iran
چکیده English

One of the prevalent industrial methods for manufacturing composite structures is fiber winding, a technique extensively employed for producing axis-symmetric parts. This method has gained considerable popularity due to its capability to create lightweight yet durable structures, making it particularly valuable in industries such as aerospace and automotive. The lightweight nature of these composites allows for enhanced fuel efficiency and performance, which are critical factors in these sectors. However, one of the most common damage mechanisms encountered in these composite structures is delamination, which can occur under various loading conditions, such as tension, compression, and shear. This phenomenon can lead to a significant reduction in both the performance and lifespan of the structures, posing challenges in their application.

In this study, we investigated the mechanical behavior and propagation of the initial mode I crack in carbon/epoxy curved beams fabricated using the fiber winding (FW) method, employing the acoustic emission (AE) technique for analysis. To achieve this, a composite tube was first manufactured with an artificial interlaminar separation, from which beam samples were cut along its longitudinal direction. In the initial phase of the research, the initiation of failures was identified using the AE method, which allows for real-time monitoring of crack propagation. Subsequently, the growth and propagation of interlaminar delamination were evaluated through the energy of AE signals and the centroid function. By determining the velocity of AE waves and implementing a filtering method to remove unwanted signals, we were able to predict the instantaneous position of the delamination tip during its growth.

The results indicated that the fiber bridging phenomenon was a result of the interpenetration of two adjacent regions at the delamination interface. Notably, the length of the fiber bridging zone had a significant impact on the mode I fracture toughness of the delamination. Furthermore, as the fiber bridging area increased, the fracture toughness also exhibited an increase. A strong correlation was observed between the fracture toughness values obtained from the AE method and those derived from the ASTM D5528 standard, highlighting the reliability of the AE technique in assessing composite material performance. These findings can significantly contribute to the improved design of composite structures and enhance the ability to predict their behavior under real-world loading conditions, ultimately leading to safer and more efficient applications in various industries.

کلیدواژه‌ها English

Acoustic emission
double cantilever curve beam specimens
critical energy release rate
filament wound carbon/epoxy specimens
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  • تاریخ دریافت 30 مرداد 1404
  • تاریخ بازنگری 25 بهمن 1404
  • تاریخ پذیرش 30 بهمن 1404