مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی تجربی تأثیر وصله نانو کامپوزیتی مستطیلی و Hشکل بر خواص کششی نمونه‌های ترمیم شده آلیاژ آلومینیوم 5251

نوع مقاله : پژوهشی اصیل

نویسندگان
کیوان شیری 1
سید احسان افتخاری شهری 2
حبیب الله رستگاری کوپایی 3
1 مهندسی مکانیک، دانشکده مهندسی مکانیک و مواد، دانشگاه صنعتی بیرجند، بیرجند، ایران
2 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک و مواد، دانشگاه صنعتی بیرجند، بیرجند، ایران
3 گروه مهندسی مواد، دانشکده مهندسی مکانیک و مواد، دانشگاه صنعتی بیرجند، بیرجند، ایران
10.52547/mme.22.3.201
چکیده
جوانه‌زنی و رشد ترک در قطعات و سازه‌های مهندسی یک امر اجتناب‌ناپذیر است. تعویض قطعه یا قسمتی از آن که دچار آسیب شده، ساده‌ترین راه برای جلوگیری از وقوع از کار افتادگی است که البته همواره مقرون به صرفه نمی‌باشد. لذا در بسیاری از موارد می‌توان با تعمیر قطعه‌، عمر قطعات کار کرده معیوب را افزایش داد. ‌یکی از راهکارهای مؤثر، ترمیم محل ترک خوردگی به وسیله وصله‌های کامپوزیتی از طریق چسباندن آنها بر روی محل تشکیل ترک است. هدف این پژوهش، بررسی چگونگی اثر وصله بر رفتار رشد ترک و همچنین تاثیر هندسه وصله بر خواص مکانیکی آلیاژ آلومینیوم Al5251 می‌باشد. برای این منظور، از وصله کامپوزیتی کولار با هندسه مستطیلی و H شکل استفاده شده است. برای بررسی خواص مکانیکی و ارزیابی رفتار رشد ترک در نمونه‌ها، آزمون کشش اجرا شد. تاثیر مساحت مؤثر و شکل هندسی وصله بر قابلیت تحمل بار، میزان تغییر طول نمونه، چقرمگی و نیروی آغاز ترک بررسی شده است. نتایج بدست آمده نشان داد که با استفاده از وصله کامپوزیتی، میزان تغییر طول نمونه تا شکست، مقدار نیرو در لحظه شروع ترک و مقدار نیروی شکست نسبت به نمونه‌های بدون ترمیم افزایش یافته است. همچنین، مقایسه وصله‌ها با مساحت مؤثر برابر نشان داد نمونه ترمیم شده با وصله با هندسه H شکل، قابلیت تحمل بار بیشتری نسبت به وصله مستطیل شکل دارد. همچنین میزان چقرمگی در نمونه ترمیم شده با وصله H شکل نیز افزایش یافته است.
کلیدواژه‌ها
آلیاژ آلومینیوم 5251
ترمیم قطعه
وصله کامپوزیتی
هندسه‌ وصله‌
خواص کششی

موضوعات

عنوان مقاله English

Experimental Study of the Effects of Rectangular and H-Shaped Woven Nanocomposites Patch on tensile properties of Repaired AL5251 Sheets

نویسندگان English

Keyvan Shiri 1
Seyyed Ehsan Eftekhari Shahri 2
Habibollah Rastegari Kupaii 3
1 Department of Mechanical Engineering, Birjand University of Technology, Birjand, Iran
2 Department of Mechanical Engineering, Birjand University of Technology, Birjand, Iran
3 Department of Metallurgy Engineering, Islamic Azad University, Kerman, Iran
چکیده English

Crack nucleation and propagation in engineering segments and structures are unavoidable. Replacing a damaged part is the easiest way to prevent failure, but it is not always cost-effective. Therefore, in many cases, by repairing a component, the life of defective working parts can be increased. One of the effective strategies, is mending the cracked area using composite patches witch are glued in crack formation place. The purpose of this study was to investigate the effect of patch on crack growth behavior as well as the effects of patch geometry on the mechanical properties of repaired Al5251 aluminum alloy. For this purpose, a Kevlar-epoxy composite patch with rectangular and H-shaped geometry has been used. Tensile test was performed to evaluate the mechanical properties and the crack growth behavior in the samples. The influences of patch geometry and effective area on tensile force, specimen ductility, toughness and crack forming force have been investigated. The results showed that with the use of composite patch, ductility, force at the moment of cracking and the failure force increased compared to samples without repair. Also, comparison of patches with equal effective area showed that samples repaired with H-shaped patch have more load capacity than rectangular patch. In addition, the amount of toughness in the sample repaired with H-shaped patch has increased.

کلیدواژه‌ها English

5251 Aluminum Alloy
Sample Repairing
Composite Patch
Patch Geometry
Tensile properties
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مهندسی مکانیک مدرس
دوره 22، شماره 3
اسفند 1400
صفحه 201-211