نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجو دکترا، مهندسی نساجی، دانشگاه صنعتی اصفهان، اصفهان - ایران

2 دانشیار، مهندسی نساجی، دانشگاه صنعتی اصفهان، اصفهان - ایران

3 استاد، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران ، ایران

چکیده

در این تحقیق رفتار ضربه ثقلی نوع جدیدی از هسته‌های سه بعدی بافته شده به روش بافندگی حلقوی پودی بررسی شده است. هسته‌های سه بعدی بافته شده به روش بافندگی حلقوی پودی و بوسیله یک ماشین تخت باف با دو سطح مقطع هندسی مثلثی و مستطیلی بافته شدند. کامپوزیتهای ساندویچی از این هسته‌های سه بعدی به روش تزریق رزین به کمک کیسه خلا تولید شدند. نتایج نیروی تماس ضربه ثقلی در سه سطح انرژی مختلف برروی نمونه‌های کامپوزیت ساندویچی سه بعدی با سطح مقطع مستطیل و مثلث نشان داد که استحکام نمونه با سطح مقطع مثلثی در مقایسه با نمونه با سطح مقطع مستطیلی در تمام سطوح انرژی ضربه ثقلی بیشتر بوده است. همچنین با افزایش سطح انرژی ضربه ثقلی نیروی تماس ضربه برای تمام نمونه‌ها افزایش داشته است. آسیب وارد شده به نمونه‌ها شامل ترک‌های عرضی ایجاد شده در پوسته و ترک در لایه‌های اتصال در هسته بود. همچنین با افزایش سطح انرژی ترک در پوسته زیرین و تورفتگی در نقطه مورد اصابت ضربه مشاهده شد. هیچگونه تورق میان پوسته و هسته در کامپوزیت‌های ساندویچی سه بعدی حلقوی پودی مشاهده نشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Three dimensional weft knitted sandwich composites under drop-weight impacts in different energy levels

نویسندگان [English]

  • Mohammad Azadian 1
  • Hossein Hasani 2
  • Mahmood Mehrdad Shokrieh 3

1 Department of Textile Engineering, Isfahan University of Technology, Isfahan, Iran

2 Department of Textile Engineering, Isfahan University of Technology, Isfahan, Iran

3 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

چکیده [English]

In this study the behavior of a novel 3D integrated weft knitted sandwich composite (3DIWKSCs) were investigated. The weft knitted spacer fabrics produced by E-glass fibers on a flat knitted machine with tow cross-sectional shapes (rectangular and triangular). The 3DIWKSCs manufactured by use of the vacuum assisted resin transfer molding (VARTM). The results of the 3DIWKSCs with tow cross-sectional shapes under drop-weight impact tests in three energy levels showed that the triangular-shape of 3DIWKSC has the higher strength in all energy levels of impact than the rectangular-shape of 3DIWKSC. Furthermore the contact force of 3DIWKSCs was increased by increasing of the energy level of impacts. The main damage modes of 3DIWKSCs under impacts were the transverse cracks on the upper face-sheets and the cracks on the connecting layers of the core. Also, by increasing the energy level, cracks occurred in the lower face-sheets as the curved area and the local indentation were created underneath the impactor. There is no any de-bonding between the core-face of the 3DIWKSCs under drop-weight impact tests.

کلیدواژه‌ها [English]

  • 3D Integrated weft knitted sandwich composites
  • Drop-weight impact
  • Energy level
  • Damage
  • Effect of core cross-sectional shape

 

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