مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی آزمایشگاهی اثر میکرو الیاف های طبیعی بر چقرمگی شکست مود I چندلایه های کامپوزیتی با الیاف بافته شده

نوع مقاله : پژوهشی اصیل

نویسندگان
علی زین العابدین بیگی 1
مظاهر سلامت طلب 2
امین فرخ آبادی 3
حسن مسلمی نائینی 4
1 دانشجوی کارشناسی ارشد، گروه مهندسی ساخت و تولید، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران
2 استادیار، گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه صنعتی اراک، اراک، ایران
3 دانشیار، گروه مهندسی هوافضا، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران
4 استاد، گروه مهندسی ساخت و تولید، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران
چکیده
در مطالعه حاضر به بررسی اثر میکرو الیاف­ های طبیعی (ذرات کرک) بر چقرمگی شکست مود I چندلایه­ های کامپوزیتی با الیاف بافته شده پرداخته شده است. به همین منظور نمونه­ های تیر دو لبه یکسر گیردار (DCB) با استفاده از روش لایه چینی دستی و با چیدمان 28]0[ ساخته شده­ اند. برای بررسی اثر ذرات میکرو کرک بر چقرمگی شکست، نمونه­ هایی با دو درصد وزنی مختلف (1% وزنی و 3% وزنی) ساخته شده و نتایج بدست آمده با نمونۀ با رزین اپوکسی خالص مقایسه گردیده است. نتایج آزمایشگاهی نشان می ­دهد که با افزایش مقدار ذرات کرک، مقدار چقرمگی بین­ لایه­ای شروع تورق افزایش داشته است. مقدار بهبود چقرمگی شکست شروع برای نمونۀ DCB با %1 و %3 وزنی کرک به ترتیب %67.15 و %71.96 موجب افزایش شده است که علت این امر به نقش کرک در ناحیه غنی از رزین در نوک ترک بر می­ گردد که مانع شروع تورق در این ناحیه شده است. بر خلاف چقرمگی شکست شروع، چقرمگی شکست رشد با اضافه کردن ذرات کرک به رزین کاهش یافته است. در حین رشد تورق از آنجائیکه این الیاف به دلیل تجمع و کلوخگی در فصل مشترک تورق موجب ایجاد نواحی تمرکز تنش می­ گردند، در نتیجه میکرو الیاف­ های کرک نتوانسته ­اند مقدار چقرمگی شکست رشد را افزایش داده و در بعضی موارد موجب کاهش اندک چقرمگی شکست رشد تورق شده است. همچنین به منظور بررسی مکانیزم­ های آسیب، از سطوح شکست نمونه ­ها با استفاده از میکروسکوپ الکترونی روبشی عکسبرداری شده است.
کلیدواژه‌ها
ذرات میکرو کرک
مود I شکست
تیر دو لبه یکسر گیردار
تورق
چندلایه های کامپوزیتی

موضوعات

عنوان مقاله English

Experimental investigation of the effect of natural microfibers on the mode I fracture toughness of plain-woven laminated composites

نویسندگان English

Ali Zeinolabedin Beygi 1
Mazaher Salamat-talab 2
Amin Farrokhabadi 3
Hassan Moslemi Naeini 4
1 Master of Science Student, Department of Mechanical Engineering, Tarbiat Modares University
2 Assistant professor, Department of Mechanical Engineering, Arak University of Technology, Arak, Iran
3 Associate Professor, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
4 Professor, Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
چکیده English

In the present study, the effect of natural microfibers (cork particles) on the mode I fracture toughness of plain-woven laminated composites has been investigated. For this purpose, double cantilever beam (DCB) specimens manufactured using hand lay-up method with stacking sequence of [0]28. To investigate the effect of cork particles on fracture toughness, samples with two different weight percentages (1% by weight and 3% by weight) were manufactured and the experimental results were compared with one obtained from sample with pure epoxy resin. Experimental results show that as the amount of cork particles increases, the onset of crack growth requires more energy. The amount of improvement in initiation fracture toughness for the DCB sample with 1% and 3% cork weigh has been increased by 67.15% and 71.96%, respectively which is due to the role of the cork in the resin rich area near the crack tip that arrested the delamination growth. Unlike the initiation fracture toughness, the propagation value is reduced by adding cork particles to the resin. During delamination growth, due to the agglomeration of micro fiber at delamination interface and role of stress concentration of these particles, hence, micro-cork fibers have not been able to increase the propagation fracture toughness and in some cases have slightly reduced the propagation fracture toughness of the delamination. Also, in order to investigate the mechanisms of damage, the fracture surfaces of the samples were scanned using scanning electron microscopy.

کلیدواژه‌ها English

Micro cork particles
Mode l fracture
Double cantilever beam
Delamination
Laminated composite
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مهندسی مکانیک مدرس
دوره 22، شماره 2
بهمن 1400
صفحه 71-79