تحلیل کمانش و پس‌کمانش پانل ساندویچی با هسته انعطاف‌پذیر تقویت شده با سیم‌های آلیاژ حافظه‌دار

پورموید, علیرضا; ملک زاده فرد, کرامت; رنجبر, محمدعلی

تحلیل کمانش و پس‌کمانش پانل ساندویچی با هسته انعطاف‌پذیر تقویت شده با سیم‌های آلیاژ حافظه‌دار

نوع مقاله : مکانیک جامدات

نویسندگان

¹ استادیار، دانشکده مهندسی مکانیک، دانشگاه پدافند هوایی خاتم الانبیاء(ص)، تهران، ایران

² عضو هیات علمی دانشگاه مالک اشتر

³ دانشکده مکانیک، دانشگاه پدافند هوایی خاتم الانبیاء(ص)

چکیده

آلیاژ‌های حافظه‌دار عنوان گروهی از مواد هوشمند می‌باشند که خواص متمایز و برتری نسبت به سایر آلیاژها دارند. رفتار تنش- کرنش این مواد دو پدیده غیرخطی خاص را در برمی‌گیرد، اثر حافظه‌داری و اثر شبه‌الاستیک. رفتار آلیاژ طی این دو اثر به‌گونه‌ای است که بعد از ورود آن به حالت پلاستیک، ماده شکل اولیه خود را بازیابی خواهد کرد. پژوهش انجام‌شده بر پایه مدل‌سازی این دو رفتار آلیاژهای حافظه‌دار در نرم‌افزار آباکوس و با استفاده از کد یومت می‌باشد. شبیه‌سازی کمانش و پس‌کمانش پانل‌های ساندویچی از مواردی است که در این پژوهش مورد بررسی قرار گرفته‌اند. تهیه کد یومت خواص آلیاژ حافظه‌دار امکان هرگونه استفاده از امکانات آباکوس جهت تحلیل رفتار سازه‌های هوشمند ساخته شده با آلیاژ حافظه‌دار را برای طراح فراهم می‌سازد. همچنین در این پژوهش، ابتدا نیروی بحرانی کمانش پنج مود اول به ازای درصدهای متفاوت آلیاژ در پوسته‌ها و هسته مطالعه شده و سپس اثرات تغییر درصد حجمی آلیاژها، فاصله از محور خنثی، تغییر زوایای الیاف و اثر کرنش اولیه آلیاژ حافظه‌دار بر پایداری و رفتار پس از کمانش مورد بررسی قرار گرفته است. بررسیها نشان از ایجاد تغییرات زیاد آلیاژ حافظه‌دار روی نتایج به دلیل تنش بازیابی بزرگی که در حین تغییر فاز ایجاد می‌کنند، را دارد.

کلیدواژه‌ها

20.1001.1.26455323.1400.17.1.7.8

عنوان مقاله [English]

Buckling and Post-buckling Analysis of a Sandwich Panel with Flexible Core Reinforced with Memory Alloy Wires (SMA)

نویسندگان [English]

Alireza Pourmoayed ¹
Karamat Malekzadeh fard ²
Mohammad Ali Ranjbar ³

¹ Asistant prof, Department of Mechanical Engineering, Khatmol Anbia Air Defense, Tehran, Iran

² malek ashtar univ

³ khatamol anbia university

چکیده [English]

Shape Memory Alloys (SMAs) are a group of intelligent materials which have distinct and superior properties compared to other alloys. The stress-strain behavior of these materials involves two specific nonlinear phenomena, namely the Shape Memory effect and the quasi-elastic effect. The behavior of the alloy whilst subject to these two phenomena is such that after it enters the plastic state, the material will regain its original form. The research is based on the modeling of these two behaviors of memory alloys in the ABAQUS software using UMAT code. In this study, the simulation of buckling and post-buckling of sandwich panels have been investigated. Preparing a UMAT memory alloy properties code, enables the designer to use any ABAQUS features to analyze the behavior of smart structures made with the shape memory alloy. Also, in this research, the first buckling critical force of the first five modes for different percentages of the alloy in the shell and core have been studied, and then the effects of volumetric percentage change of alloys, distance from neutral axis, fiber angle variations, and finally stability and post-buckling behavior of the memory alloy as the result of initial strain have been investigated. The investigations have shown large changes in the shape memory alloy due to the great recovery stress during the phase shift.

کلیدواژه‌ها [English]

Shape Memory Alloys
Sandwich panels
Buckling
Post-buckling
UMAT Subroutine

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