نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، مهندسی نساجی، دانشگاه صنعتی امیرکبیر، تهران.

2 دانشیار، مهندسی نساجی، دانشگاه صنعتی امیرکبیر، تهران.

3 کارشناس ارشد، مهندسی نساجی، دانشگاه صنعتی امیرکبیر، تهران.

10.22068/jstc.2021.141824.1694

چکیده

در این پژوهش، رفتار ضربه پذیری کامپوزیت‌های برپایه فوم پلی‌ یورتان تقویت شده با پارچه‌های دوجداره حلقوی تاری مورد بررسی قرارگرفته است. بدین منظور، پارچه‌های حلقوی تاری دوجداره با متغیرهای ساختمانی از جمله دو ضخامت متفاوت، اندازه‌ی مش‌های بزرگ و کوچک و همچنین، موقعیت قرارگیری روبرو و غیر‌روبرو مش‌ها نسبت به هم تولید شد. سپس نمونه‌های کامپوزیتی متشکل از پارچه دوجداره حلقوی تاری به عنوان جز تقویت‌کننده و فوم پلی یورتان به عنوان زمینه تولید و خواص فیزیکی مدنظر از جمله وزن واحد سطح و کسر حجمی الیاف در آنها اندازه‌گیری شده است. در آزمون شبه استاتیکی ضربه، مقدار انرژی شکست اندازه‌گیری شد و درنهایت همه نمونه ها مورد آزمون ضربه سرعت پایین با انرژی اولیه 5 ژول قرار گرفته‌اند. نتایج نشان داد با قراردادن پارچه تقویت کننده در نمونه های فوم انرژی ضربه این نمونه ها حداقل 3 برابر شده است. بیشینه جذب انرژی در نمونه دارای پارچه با مش بزرگ، ضخامت زیاد و قرار گیری غیرروبروی مش‌ها نسبت به هم رخ داده است که این مقدار برابر 858/2 ژول می‌باشد. به طور میانگین، جذب انرژی کامپوزیت‌ها با افزایش ضخامت نمونه‌ها، 2/21 درصد، با تغییر اندازه مش‌ها از کوچک به بزرگ 5/9 درصد و با تغییر موقعیت مش‌ها از حالت روبرو به حالت غیر‌روبرو 3/47 درصد افزایش پیدا کرده است.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental study of the impact properties of foam based composites reinforced with warp-knitted spacer fabric

نویسندگان [English]

  • Amir Hossein Dodanke 1
  • Hadi Dabiryan 2
  • Saeid Hamze 3

1 Textile Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.

2 Textile Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.

3 Textile Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.

چکیده [English]

In this paper, the impact behavior of polyurethane foam-based composites reinforced with warp-knitted spacer fabric is investigated, experimentally. For this purpose, warp-knitted spacer fabric with different structures such as two different thickness, small and large mesh sizes and position of the meshes facing each other and not facing each other were produced. Then composite samples were fabricated using warp-knitted spacer fabrics as reinforcement, and polyurethane foam as matrix. The physical properties of samples like weight per unit area and fiber volume fraction of composite were measured. The failure energy of prepared samples was measured during quasi-static impact test, and finally low velocity impact with an initial energy of 5 J was carried out on composite samples. The results showed that the impact energy of samples is increased at least tripled by using the reinforcement. The maximum energy absorption is 2.858 J which is related to the samples reinforced with fabric with large mesh, high thickness and not facing of the meshes relative to each other. Generally, the energy absorption on average has been increased 21.2% by increasing the thickness, 9.5% by increasing the size of the meshes from small to big, and 47.3% by changing the position of the meshes from facing to non-facing.

کلیدواژه‌ها [English]

  • Warp knitted spacer fabric
  • composites
  • Low velocity impact
  • Foam
  • geometrical parameter
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