نویسندگان

1 تهران، دانشگاه تربیت مدرس، دانشکده مهندسی مکانیک

2 تهران، دانشگاه هوایی شهید ستاری، دانشکده مهندسی هوافضا.

3 تهران، دانشگاه هوایی شهید ستاری، دانشکده مهندسی هوافضا

چکیده

بررسی تجربی و عددی رفتار خمشی نوع جدیدی از ساختارهای ساندویچی با رویه­هایی از جنس شیشه-اپوکسی و هسته­ای ترکیبی از فوم و کامپوزیت موج­دار با هندسة مربعی در این مقاله انجام شده است. پس از ساخت نمونه­ها با استفاده از تکنیک انتقال رزین به کمک خلاء ، نمونه­ها بر طبق استاندارد تحت آزمایش قرار گرفته و نمودار­های نیرو-جابه­جایی مربوط به هر کدام بدست آمد. حل المان محدود برای مشخص کردن بیشترین جابه­جایی در نمونه­ها با استفاده از نرم­افزار آباکوس انجام شد. در حل تجربی، سه سری نمونه با هسته­های ترکیبی و سه ضخامت مختلف در کامپوزیت موج­دار با هندسة مربعی تعبیه شده در هسته­ای فومی و یک سری نمونه با هستة سادة فومی ساخته شد. به منظور صحت­سنجی تجربی مسئاله، از هر حالت سه نمونة یکسان ساخته شد و از میانگین داده­ها در نتایج استفاده شد. نشان داده شد که سفتی خمشی با افزایش ضخامت کامپوزیت موج­دار داخل هسته، افزایش می­یابد. همچنین نسبت سفتی خمشی به جرم با افزایش ضخامت، افزایش می­یابد؛ اما روند این افزایش با افزایش ضخامت از سه لایه به پنج لایه ؛ به نسبت تقریباً یک به دو کاهش می یابد. در نهایت نتایج تجربی و عددی با هم مقایسه شدند، که تطابق قابل قبولی بین این دو مشاهده شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of corrugated composite laminate thickness imprised in foam core on flexural behavior of sandwich structure with composite skins and a corrugated combinatorial core with rectangular geometry

نویسندگان [English]

  • Rahmat olah Rahmani 1
  • Mostafa Livani 2
  • Mostafa Livani 3

1 Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran

2 Tehran, Shahid Sattari Aviation University, Faculty of Aerospace Engineering.

3 Tehran, Shahid Sattari Aviation University, Faculty of Aerospace Engineering

چکیده [English]

The experimental and numerical study on flexural behavior of new type sandwich structures with glass-epoxy skins and a combinatorial core consist of foam and corrugated composite with rectangular geometry was investigated in this paper. After sample production by vacuum assisted resin transform molding technique; samples were tested according to standard and then the related load-deflection curves were obtained. Finite element analysis was applied for determining maximum deflection of samples by ABAQUS software. In experimental three series of samples with combinatorial core and three different thicknesses for rectangular shape corrugated composite in a foam core and one series of sample with simple foam core; have been product. In order to experimental accuracy of problem; three same samples have been product in each case and the average data have been used for results. It has been shown that the flexural stiffness was increased with increasing in thickness; and the flexural stiffness to mass ratio was increased so on; but the rate of this increasing was decreased from 3 to 5 layers of corrugated composite laminate in PVC foam. Finally the experimental and numerical results were compared and a reasonable agreement between them has been observed.    

کلیدواژه‌ها [English]

  • SandwichStructures
  • CorrugatedCore
  • RectangularShape
  • Composite Skins
  • Thickness Effect
  • Flexural Behavior
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