مطالعه‌ی عددی و تجربی میزان جذب انرژی سازه‌ی لانه‌زنبوری هدفمند با سفتی منفی ‏تحت بارگذاری شبه‌استاتیکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مکانیک، دانشکده مهندسی، دانشگاه بیرجند، بیرجند، ایران

2 دانشیار گروه مهندسی مکانیک- دانشگاه بیرجند

چکیده

سازه‌های لانه‌زنبوری هدفمند با سفتی منفی به دلیل داشتن دو ویژگی هدفمند بودن و سفتی منفی می‌توانند دارای کاربرد فراوان به عنوان جاذب انرژی باشند. در این پژوهش تاثیر هدفمند نمودن سازه‌های لانه‌زنبوری با سفتی منفی در افزایش میزان جذب انرژی بررسی شده است. در این لانه‌زنبوری‌ها هدفمند نمودن سازه با تغییر تدریجی در ضخامت تیرهای خمیده در هر لایه انجام شده است. سازه لانه‌زنبوری با سفتی منفی نوعی جاذب انرژی است که با تغییر از یک مود کمانش به مود دیگر و رفتار فراجهش مانند در سلول‌ها، باعث جذب انرژی می‌شود. در این تحقیق ابتدا آزمایش تراکم شبه‌استاتیکی بر روی لانه‌زنبوری با سفتی منفی و ضخامت ثابت انجام شده است. پس از آن، مدل اجزاء محدود سازه، تحت تراکم شبه‌استاتیکی در نرم‌افزار آباکوس شبیه‌سازی شده و نتایج حاصل از شبیه‌سازی عددی با نتایج آزمایشگاهی مقایسه شده است. با مقایسه نتایج تجربی و عددی، انطباق مناسبی بین نتایج مشاهده می‌شود. سپس لانه‌زنبوری هدفمند با سفتی منفی در نرم‌افزار آباکوس شبیه‌سازی شده و عملکرد جذب انرژی در آن با لانه‌زنبوری با سفتی منفی و ضخامت ثابت مقایسه شده است. نتایج این مقایسه نشان می‌دهد که میزان جذب انرژی در واحد جرم برای لانه‌زنبوری هدفمند 1/57 برابر افزایش یافته است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical and Experimental Study of Energy Absorption Amount of Functionally Graded Honeycomb with Negative Stiffness Property under Quasi-Static Load

نویسندگان [English]

  • Mahdiyeh shafipour 1
  • Seyed Yousef Ahmadi-Brooghani 2
1 Department of Mechanical Engineering, University of Birjand, Birjand, Iran
2 Assoc. Prof., Mech. Eng., University of Birjand, Birjand , Iran
چکیده [English]

Functionally graded honeycomb with negative stiffness can be used extensively as an energy absorber because of having two features of negative stiffness and being functionally graded. In this research, the effect of using functionally graded honeycomb with negative stiffness in increasing energy absorption has been considered. In functionally graded honeycomb the thicknesses of structure change gradually in each layer, as a result, each layer has a different stiffness. Negative stiffness honeycomb is a type of energy absorbers that absorb energy by the transition from one buckled shape to another and show snap through- like behavior.In this research, at first quasi-static tests have been carried out on negative stiffness honeycombs with constant thickness. Then finite element model of negative stiffness honeycomb with constant thickness is simulated in ABAQUS software and the results of simulation are compared with experimental results and a good agreement between numerical and experimental results has been observed. Functionally graded honeycomb with negative stiffness then has been modeled numerically. Energy absorption per unit mass of the functionally graded negative stiffness honeycomb has been compared with conventional ones. Based on the results, energy absorption per unit mass in functionally graded honeycomb with negative stiffness increased by 1.57 times.

کلیدواژه‌ها [English]

  • Functionally graded Honeycomb
  • Negative stiffness
  • Snap through
  • Energy Absorption
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