علوم و فناوری کامپوزیت

مطالعه آماری تاثیر شرایط مختلف ماشینکاری بر میزان لایه‌لایه‌شدگی در سوراخکاری کامپوزیتهای تقویت شده با الیاف کربن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، مهندسی مکانیک، گروه دانشگاه کاشان، کاشان، ایران

2 دانشجوی دکترا، مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران

3 دانشجوی کارشناسی ارشد، مهندسی مکانیک، دانشگاه غیرانتفاعی علامه نائینی، نائین، ایران

چکیده

کامپوزیتهای تقویت‌شده با الیاف کربن دارای کاربردهای صنعتی متعددی می‌باشند که به علت خواص مکانیکی و فیزیکی مناسب آنها می‌باشد. سوراخکاری از جمله روشهای رایج برای ایجاد اتصال بین سازه‌های از جنس مواد تقویت‌شده با الیاف می‌باشد. لایه‌های کامپوزیتهای تقویت‌شده با الیاف در عملیات ماشینکاری مخصوصاً در عملیات سوراخکاری که در معرض تمرکز تنش قرار می‌گیرند، دچار آسیب لایه‌لایه‌شدگی می‌گردند. پدیده لایه‌لایه‌شدگی به شدت تحت تاثیر عواملی مانند جنس و هندسه ابزار و قطعه‌کار و همچنین پارامترهای ماشینکاری قرار دارد. در این پژوهش با استفاده از طراحی آزمایشات به روش تاگوچی، مطالعه‌ای تجربی بر روی فرآیند سوراخکاری کامپوزیت تقویت‌شده با الیاف کربن (CFRP) با ابزار از جنس کاربید تنگستن به منظور بررسی میزان لایه‌لایه‌شدگی انجام گردید. پارامترهای مورد بررسی شامل پیش‌مته‌زنی، سرعت دورانی، نرخ پیشروی، قطر ابزار و ضخامت قطعه‌کار می‌باشد. با توجه به آزمایشات انجام‌شده مشاهده گردید انجام عملیات پیش‌مته‌زنی، افزایش سرعت دورانی و کاهش سرعت پیشروی موجب کاهش آسیب لایه‌لایه‌شدگی شده و کیفیت سوراخ را بهبود می‌بخشد. همچنین استفاده از ابزار سوراخکاری با قطر کمتر و بکارگیری کامپوزیت نازکتر منجر به کاهش مقدار لایه‌لایه‌شدگی می‌گردد. با توجه به نتایج بدست‌آمده، در نرم افزار مینی‌تب، آنالیز واریانس (ANOVA) جهت بررسی کیفیت سوراخ ایجادشده و میزان تاثیرگذاری هر یک از پارامترها انجام شد. از بین پارامترهای مورد بررسی، ضخامت قطعه‌کار دارای بیشترین تاثیر بر مقدار لایه‌لایه‌شدگی می‌باشد. همچنین مقدار بهینه جهت به حداقل‌رساندن میزان لایه‌لایه‌شدگی بدست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Statistical study of the effect of various machining parameters on delamination in drilling of carbon fiber reinforced composites

نویسندگان [English]

  • Saeed Amini 1
  • Mohammad Baraheni 2
  • Morteza Moeini Afzal 3

1 - Department of Manufacturing, Faculty of Mechanic, University of Kashan, Kashan, Iran

2 - Department of Manufacturing, Faculty of Mechanic, University of Kashan, Kashan, Iran

3 Department of Manufacturing, Faculty of Mechanic, University of Allame Naeini, Naein, Iran

چکیده [English]

Carbon fiber reinforced composites because of suitable mechanical and physical properties are used in numerous industrial applications. Drilling is a common method to connect fiber reinforced material structures. Fiber reinforced composite laminates in machining operations, especially in drilling which is subjected to stress concentration, tend to be delaminated. Delamination phenomena is extremely under the influence of factors like tool and workpiece geometry and material as well as machining parameters. In this research, by using Taguchi experiment design method, an experimental study conducted on drilling of carbon fiber reinforced composite with tungsten carbide tool to investigate amount of delamination. Discussed parameters include predrilling, rotational speed, feed rate, tool diameter and workpiece thickness. According to conducted experiments, observed that predrilling, rotational speed increment and feed rate decrement cause delamination damage reduction and hole quality improvement. Also using drilling tool with smaller diameter and utilization of thinner composite cause delamination reduction. As for achieved results, in Minitab software, Analysis of Variance(ANOVA) carried out to examine hole quality and effectiveness of each parameter. Among examined parameters, workpiece thickness has the most effect on the amount of delamination. Optimized parameters to reduce the delamination also obtained.

کلیدواژه‌ها [English]

  • Carbon fiber reinforced composite
  • Delamination
  • Machining parameters
  • Workpiece thickness
مراجع
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علوم و فناوری کامپوزیت
دوره 5، شماره 1
خرداد 1397
صفحه 41-50
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