نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه تفرش، تفرش، ایران

2 استادیار، دانشکده مهندسی مکانیک، دانشگاه تفرش، تفرش، ایران

چکیده

در این مقاله تاثیر نسبت قطر موثر نمونه بر قطر پانچ و سرعت بارگذاری و شکل هندسه نفوذکننده در رفتار خواص شبه استاتیکی برش پانچ (QS-PS) در کامپوزیت‌های چندلایه‌ای به‌طور تجربی بررسی می‌شود. مواد کامپوزیتی از 12 لایه الیاف شیشه با بافت دو بعدی با چگالی سطحی g/  200  به‌روش لایه‌چینی دستی ساخته شده است. سیستم رزین نیز از یک اپوکسی، دیکلیسیدیل اتر بیسفنول نوع آ با نام تجاری ایپون 828 به‌عنوان پایه و از سیکلوآلیفاتیک آمین اصلاح شده با نام تجاری اف205 به‌عنوان سفت‌کننده ساخته شده است. در این پژوهش از دو نسبت دهانه 5 و10 و از سه نرخ کرنش mm/min 5، 250 و 500 و همچنین از سه نفوذکننده‌ی تخت، مخروطی و اجیوال استفاده شده است. نتایج حاصل از بررسی نسبت دهانه‌ها نشان می‌دهد که با کاهش نصف اندازه‌ی نسبت دهانه، تغییر شکل صفحه هدف کمتر شده و نیروی تماسی تقریباً 20 درصد افزایش می‌یابد. نتایج برش پانچ در نرخ کرنش‌های مختلف نشان می‌دهد که با افزایش سرعت بارگذاری، استحکام کامپوزیت در برابر نفوذکننده افزایش می‌یابد. در مقایسه نتایج نفوذکننده‌ها با دماغه‌های مختلف حاکی از آن است که بیشترین نیروی تماسی مربوط به نفوذکننده سرتخت و بیشترین انرژی جذب شده توسط نفوذکننده مخروطی می‌باشد.

چکیده تصویری

کلیدواژه‌ها

عنوان مقاله [English]

Experimental investigation of the effect effective of factors and parameters on the punch on the properties of quasi-static punching shear the glass/epoxy composite

نویسندگان [English]

  • mohammad sadeghi 1
  • Mohammad Hosein Pol 2

1 Department of Mechanical Engineering, Tafresh University, Tafresh, Iran.

2 Department of Mechanical Engineering, Tafresh University, Tafresh, Iran.

چکیده [English]

In this paper, the effective diameter of the punch and the speed of loading and geometry penetrating properties of quasi-static punching (QS-PS) laminate composites has been studied experimentally. The composites have 12 layers of 2D woven glass fiber with area density of 200 g/m2, is manufactured by Hand lay-up method. Epoxy resin systems is made of a diglycidyl ether of  bisphenol A (DGEBA), Epon 828, as the epoxy prepolymer and Epikure F-205 as the curing agent. In this study, of two ratio of span 5 and 10 and three strain rate 5, 250 and 500 mm / min as well as three indenters with flat, conical and ogival used. The results of investigation ratio of span show that with decrease half size in the ratio of span, deform the target page lower and contact force 20% increases. Results punching shear at different strain rates shows that with increasing strain rate, composite strength increases. In comparing the results of indenter with different geometries indicate that the flat indenter has higher contact force and maximum of the absorbed energy is by the cone indenter.  

کلیدواژه‌ها [English]

  • Laminate composite
  • Punch shear
  • Strain Rate
  • Spans rate and indenter geometry

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