Latifi-rostami, S., Akbari Alashti, R., Kolahdooz, A. (2015). The Effect of Geometrical Parameters of Cylindrical Composite Lattice Structures on Buckling Behavior. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 8(3), 197-207.
S.A. Latifi-rostami; R. Akbari Alashti; A. Kolahdooz. "The Effect of Geometrical Parameters of Cylindrical Composite Lattice Structures on Buckling Behavior". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 8, 3, 2015, 197-207.
Latifi-rostami, S., Akbari Alashti, R., Kolahdooz, A. (2015). 'The Effect of Geometrical Parameters of Cylindrical Composite Lattice Structures on Buckling Behavior', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 8(3), pp. 197-207.
Latifi-rostami, S., Akbari Alashti, R., Kolahdooz, A. The Effect of Geometrical Parameters of Cylindrical Composite Lattice Structures on Buckling Behavior. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2015; 8(3): 197-207.
The Effect of Geometrical Parameters of Cylindrical Composite Lattice Structures on Buckling Behavior
1Master of Science, Department of Mechanical Engineering, , Babol University of Technology, Mazandaran, Iran.
2Associate Prof., Department of Mechanical Engineering, Babol University of Technology, Mazandaran, Iran.
3Assistant Prof., Department of Mechanical Engineering, Islamic Azad University, Khomeinishahr Branch, Isfahan, Iran
Abstract
Due to their light weights and high load carrying capacities, composite structures are widely used in various industrial applications especially in aerospace industry. Stiffening ribs are the main features of lattice type composite structures. Strength to weight ratio is known to be as one of the most critical design parameter in these structures. In this study, the effect of some parameters such as the physical characteristics of the material, shell thickness, angle, thickness and number of ribs on distribution of stresses and buckling loads of shell are investigated. For this purpose, 3D finite element analysis using ANSYS software explicitly was done and then compared with experimental test results. Increasing the thickness of the outer shell causes the structural strength will rise to 50 percent. The next effective parameter is reduction of rib angle which provides an increase of 30 percent in specific load. Although Stiffenerrs (ribs) have a major role in load carrying, but increasing the rib number causes the structural weight rises, thus compared with the two previous parameters do not have a significant effect on the strength of structures
بررسی تأثیر پارامترهای هندسی سازه های مشبک استوانه ای کامپوزیتی در رفتار کمانشی
Authors [Persian]
علی لطیفی رستمی, رضا اکبری آلاشتی, امین کلاه دوز
Abstract [Persian]
سازههای کامپوزیتی مشبک به دلیل نسبت مقاومت به وزن بالا به صورت گستردهای در صنایع هوا- فضا مورد استفاده قرار میگیرند. شبکه ریبهای تقویتشده ویژگی اصلی در این سازهها است. با توجه به این ویژگی، نسبت مقاومت به وزن سازه به عنوان معیار طراحی در نظر گرفته میشود. در این پژوهش پارامترهایی از قبیل مشخصات فیزیکی ماده، ضخامت پوسته، زاویه، ضخامت و تعداد ریب روی توزیع میدان تنش و بار کمانشی پوسته مورد بررسی قرار میگیرد. برای بررسی این تغییرات، روش تحلیل المان محدود 3 بعدی و با استفاده از مدل صریح در نرمافزار ANSYS صورت پذیرفته و نتایج حاصل با نتایج تستهای تجربی مقایسه میشود. افزایش ضخامت پوسته خارجی 50 درصد افزایش استحکام سازه را در پی دارد و پارامتر بعدی که مؤثر است کاهش زاویه ریب است که افزایش 30 درصدی بارویژه را بوجود می آورد. هرچند تقویت کننده ها (ریب ها) نقش اصلی در تحمل بار را دارند اما افزایش تعداد آنها چون افزایش وزن سازه را بدنبال دارد به نسبت دو پارامتر قبلی تأثیر چشمگیری در افزایش استحکام سازه ندارد.
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