مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

بررسی تجربی آسیب در ساندویچ پانل چندلایه موج‌دار تحت خمش سه‌نقطه‌ شبه استاتیکی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران
2 دانشیار، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران
3 دانش‌آموخته دکتری، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران
چکیده
امروزه مواد کامپوزیتی و ساختارهای ساندویچی به دلیل خواص منحصر‌به‌فردی مثل استحکام به وزن بالا، مقاومت در برابر خوردگی، توانایی جذب انرژی و صدا مورد ‌مطالعه قرار گرفته‌اند. یکی از مهم‌ترین کاربردهای کامپوزیت‌های لایه‌ای، استفاده از آن‌ها در ساخت سازه‌های ساندویچی است. اخیراً پانل‌های ساندویچی به‌صورت وسیعی در سازه‌های مهندسی به‌واسطه خواص مکانیکی که از خود نشان می‌دهند، در زمینه‌های مختلف همچون رفتار خمشی، برشی، پاسخ به ضربه و بارگذاری‌های دینامیکی، خستگی و شبه استاتیکی مورد استفاده قرار‌گرفته‌اند. در همین راستا، این تحقیق رفتار مکانیکی ساندویچ پانل کامپوزیتی با هسته موج‌دار چند‌لایه را در معرض خمش سه‌نقطه‌ شبه استاتیکی به‌صورت تجربی بررسی کرده است. پارامترهایی مانند سفتی خمشی و حداکثر بار خمشی تحملی برای هندسه‌های هسته موج‌دار (مربعی و پروانه‌ای) در طول فرایند بارگذاری و شکست با تغییر هسته از مربعی به پروانه‌ای و افزودن فوم پلی‌اورتان مورد‌ مطالعه قرار گرفتند. هدف از افزودن کامپوزیت موج‌دار به داخل هسته، تقویت آن و در نتیجه تقویت سازه ساندویچی در برابر بارهای خمشی بدون افزایش چشم‌گیر وزن سازه است. صفحات کامپوزیت و هسته‌های موج‌دار با تکنیک انتقال رزین به کمک خلأ و با استفاده از پارچه شیشه بافته‌شده و رزین اپوکسی اِم اِل506 با 15% سخت‌کننده ساخته‌شده‌اند. نتایج تجربی نشان می‌دهد که ساندویچ پانل‌های کامپوزیتی چند‌لایه ساختار را در فرایند خمشی سه نقطه‌ شبه استاتیکی تقویت می‌کنند. مکانیسم‌های اصلی آسیب و شکست نمونه‌های ساندویچ پانل در طول فرایند تحمل بار عبارت‌ا‌ند از: ترک‌خوردگی ماتریس، شکستن الیاف، لایه‌‌لایه‌شدن، فرورفتگی موضعی، خمش سراسری، خرد شدن و کمانش دیواره‌های سلولی و رویه‌ها.
کلیدواژه‌ها

عنوان مقاله English

Experimental investigation of damage in corrugated multilayer sandwich panel under quasi-static three-point bending

نویسندگان English

Reyhaneh Shahvari 1
Amin Farrokhabadi 2
Mohammad sajjad Gazor 3
1 MSc Student, Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
2 Associate Professor, Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
3 PhD Graduate, Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
چکیده English

Today, composite materials and sandwich structures have been studied due to their unique properties such as strength to high weight, corrosion resistance, ability to absorb energy and sound. One of the most important applications of layered composites is their use in the construction of sandwich structures. Recently, sandwich panels have been widely used in engineering structures due to the mechanical properties they show in various fields such as bending behavior, shear, impact response and dynamic loads. Fatigue and quasi-static have been used. In this regard, this research has experimentally investigated the mechanical behavior of composite sandwich panel with multi-layer corrugated core subjected to quasi-static three-point bending. Parameters such as bending stiffness and maximum bending load tolerance for corrugated core geometries (square and trapezoidal) by changing the core from square to propeller and also the effect of adding polyurethane foam were studied. The purpose of adding corrugated composite inside the core is to strengthen it and, as a result, strengthen the sandwich structure against bending loads without significantly increasing the weight of the structure. Composite plates and corrugated cores are made by vacuum resin transfer technique and using E-glass woven fabric and ML506 epoxy resin with 15% hardener. The experimental results show that the multilayer composite sandwich panels strengthen the structure in the quasi-static three-point bending process. The main damage and failure mechanisms of sandwich panel samples during the load bearing process are: matrix cracking, fiber breakage, delamination, local indentation, global bending, crushing and buckling of cell walls and skins.

کلیدواژه‌ها English

Three Point Bending
Composite Sandwich Panel
Damage Mechanism
Experimental Test
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