نشریه مهندسی مکانیک امیرکبیر

نشریه مهندسی مکانیک امیرکبیر

بررسی پارامترهای مؤثر بر رشد ترک در نانوکامپوزیت‌های زمینه فلزی

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده فنی و مهندسی، گروه مهندسی مکانیک، دانشگاه قم، قم، ایران
چکیده
در این تحقیق، پارامترهای مؤثر بر رشد ترک خستگی در نانوکامپوزیت‌های زمینه فلزی مورد بررسی قرار گرفته است. جنس زمینه‌های مورد بررسی در این پژوهش آلومینیوم، نیکل، منیزیم، تیتانیوم و مس بوده و پرکننده‌ها نانولوله‌های کربنی تک‌جداره در نظر گرفته شدند. مدل‌سازی با استفاده از نرم‌افزار المان محدود آباکوس انجام شد و تأثیر پارامترهایی از جمله درصد وزنی نانولوله‌های کربنی، طول ترک اولیه، زاویه ترک اولیه، جنس زمینه‌های مختلف و ضخامت ورق بررسی گردید. تحلیل‌ها نشان داد که افزایش طول ترک اولیه منجر به افزایش نرخ رشد ترک و کاهش تعداد سیکل‌های شکست می‌شود. افزایش زاویه ترک اولیه منجر به کاهش ضریب شدت تنش و نرخ رشد خستگی شده که نتیجه آن افزایش تعداد سیکل‌های شکست است. همچنین، نانولوله‌های کربنی با درصد وزنی بالاتر، مقاومت بیشتری در برابر رشد ترک نشان دادند. ضمنا با افزایش ضخامت ورق، از ضریب شدت تنش و نرخ رشد خستگی کاسته شده و تعداد سیکل تا شکست کامل قطعه افزایش می‌یابد. در نهایت با بررسی جنس زمینه نانوکامپوزیت می‌توان گفت که استحکام خستگی مواد ترکیب شده با نانولوله کربنی تک‌جداره از کم به زیاد به ترتیب منیزیم - آلومینیوم - مس - نیکل و تیتانیوم است. این پژوهش نشان داد که ترکیب مناسب مواد و کنترل پارامترهای هندسی ترک می‌تواند به افزایش طول عمر قطعات تحت بارگذاری خستگی کمک کند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigation of Parameters Affecting Crack Growth in Metal Matrix Nanocomposites

نویسندگان English

Mohammad Salari
Seyyed Mohammad Sadegh Fatemian
Faculty of Engineering, Department of Mechanical Engineering, University of Qom, Qom, Iran
چکیده English

In this study parameters affecting fatigue crack growth in metal matrix nanocomposites were investigated. The matrix materials studied in this study were aluminum, nickel, magnesium, titanium, and copper, and the fillers were single-walled carbon nanotubes. Modeling was performed using Abaqus software, and the effects of parameters such as the weight percentage of carbon nanotubes, initial crack length, initial crack angle, different matrix materials, and sheet thickness were investigated. The analyses showed that increasing the initial crack length led to an increase in the crack growth rate and a decrease in the number of failure cycles. Increasing the initial crack angle led to a decrease in the stress intensity factor and fatigue growth rate, which resulted in an increase in the number of failure cycles. Also, carbon nanotubes with a higher weight percentage showed greater resistance to crack growth. In addition, with increasing sheet thickness, the stress intensity factor and fatigue growth rate decreased, and the number of cycles until complete failure of the part increased. Finally, by examining the material of the nanocomposite matrix, it can be said that the fatigue strength of materials combined with single-walled carbon nanotubes, from least to greatest, is magnesium, aluminum, copper, nickel and titanium. This research showed that the appropriate combination of materials and control of crack geometric parameters can help increase the life of parts under fatigue loading.

کلیدواژه‌ها English

Nanocomposite
Metal Matrix
Crack Length
Crack Angle
Fatigue Growth Rate
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