مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تحلیل ضربه کم‌سرعت ورق مستطیلی ساندویچی با رویه‌های کامپوزیتی تقویت شده با سیم‌های آلیاژ حافظه‌دار و هسته آگزتیکی انعطاف‌پذیر

نویسندگان
1 دانشگاه صنعتی خواجه نصیر الدین طوسی
2 دانشگاه صنعتی خواجه نصیرالدین طوسی
چکیده
در این مقاله به بررسی اثر آلیاژ حافظه‌دار بر پاسخ ضربه کم‌سرعت ورق ساندویچی مستطیلی با رویه‌های کامپوزیتی و هسته آگزتیکی انعطاف‌پذیر از طریق ارائه و به کارگیری یک تئوری کلی-محلی هایپربولیک مرتبه بالا جدید پرداخته شده است. برای استخراج نتایجی دقیق با کم‌ترین خطای ممکن، توزیع غیریکنواخت و وابسته به زمان برای فازهای ماده هوشمند آلیاژ حافظه‌دار و همچنین جابجایی عرضی برای هسته انعطاف‌پذیر در نظر گرفته شده است. علاوه بر این به جای استفاده از قانون متداول هرتز از قانون تماس اصلاح شده استفاده گردیده است و قوانین تماس مختلفی برای فازهای بارگذاری و باربرداری در نظر گرفته شده‌ا‌ند. آثار سفتی همه لایه‌ها به همراه ضخامت ورق بر سفتی تماس در نظر گرفته شده است. معادلات حاکم المان محدود غیرخطی حاصل شده با استفاده از یک الگوریتم تکرارشونده در هر گام زمانی حل شدند. نتایج تحلیل حاضر با نتایج تجربی مراجع دیگر مقایسه و صحت نتایج حاضر مورد تایید قرار گرفته است. در انتها اثر هسته آگزتیکی، اثر ضریب پواسون هسته، اثر سیم‌های آلیاژ حافظه‌دار و اثر انرژی ضربه‌زننده بر پاسخ ضربه ورق ساندویچی کامپوزیتی، مورد بررسی قرار گرفته‌ است. نتایج تحلیل نشان می‌دهند که هسته آگزتیکی باعث افزایش سفتی ظاهری ناحیه تماس می‌شود که نتیجه آن افزایش نیروی برخورد و کاهش خیز و مدت زمان برخورد می‌باشد. همچنین خاصیت سوپر الاستیسیته آلیاژ حافظه‌دار باعث می‌شود که این آلیاژ در حین ضربه با تشکیل حلقه هیسترزیس انرژی زیادی را جذب ‌کند که این امر باعث بهبود مقاومت به ضربه ورق ساندویچی و کاهش آسیب ناشی از ضربه می‌گردد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Low-velocity Impact Analysis of Rectangular Sandwich Plates with Composite Facesheets Reinforced by SMA Wires and Soft Auxetic Cores

نویسندگان English

M. Shariyat 1
S. H. Hosseini 2
1 K. N. Toosi University of Technology
2 K. N. Toosi University of Technology
چکیده English

In this paper, the effect of shape memory alloy on low-velocity impact response of rectangular sandwich plates with composite facesheets and soft auxetic cores is investigated using a new higher-order global–local hyperbolic plate theory. In order to obtain accurate results with the least error, non-uniform and time-dependent distribution for the phases of SMA and the transverse compliance of the soft core are considered. Also, a refined contact law is proposed instead of using the traditional Hertz law and different contact laws are considered for the loading and unloading phases. Stiffness effects of all layers along with the effect of plate thickness on contact stiffness are considered. The obtained nonlinear finite element governing equations are solved by making use of an iterative algorithm at each time step. The results of the present study are compared with the experimental results in other references, and it is proved that the results are valid. Finally, the effect of auxetic core, core Poisson's ratio, SMA wires, and indenter energy on impact response of composite sandwich plat are investigated. The results show that the auxetic core increases the apparent stiffness of the contact area that causes an increase in impact forces and a decrease in the lateral deflection and impact duration. Besides, the SMA can absorb a remarkable portion of the stored impact-induced strain energy due to the superelastic and hysteretic natures of the SMA material, which results in increasing impact strength of the sandwich plate and decreasing the damage caused due to the impact.

کلیدواژه‌ها English

Shape Memory alloy
Martensite Volume Fraction
Impact Response
Composite sandwich plate
Soft Auxetic Core
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