Moghbeli, S., Mahmoodi, M. (2015). Nonlinear Thermo-Mechanical Behaviour Analysis of Activated Composites With Shape Memory Alloy Fibres. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 8(1), 49-59.
S. Moghbeli; M.J. Mahmoodi. "Nonlinear Thermo-Mechanical Behaviour Analysis of Activated Composites With Shape Memory Alloy Fibres". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 8, 1, 2015, 49-59.
Moghbeli, S., Mahmoodi, M. (2015). 'Nonlinear Thermo-Mechanical Behaviour Analysis of Activated Composites With Shape Memory Alloy Fibres', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 8(1), pp. 49-59.
Moghbeli, S., Mahmoodi, M. Nonlinear Thermo-Mechanical Behaviour Analysis of Activated Composites With Shape Memory Alloy Fibres. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2015; 8(1): 49-59.
Nonlinear Thermo-Mechanical Behaviour Analysis of Activated Composites With Shape Memory Alloy Fibres
1MSc. Student, Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
2Assistant professor, Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
Abstract
General thermo-mechanical behavior of composites reinforced by shape memory alloy fibers is predicted using a three-dimensional analytical micromechanical method to consider the effect of fibers activation. Composite due to the micromechanical method can be exposed to general normal and shear mechanical and thermal loading which cause to activate the shape memory alloy fibers within polymeric matrix finally. Considering the capabilities of the presented micromechanical model; the fibers arrangement within the matrix is simulated as square distribution. Representative volume element of the composite system consists of two-phases including shape memory alloys fibers and polymeric matrix which is exposed to axial cyclic mechanical loading. In order to display the effect of fiber activation on the overall response of composite, the behavior of polymeric matrix is assumed elastic and shape memory alloy fibers is considered nonlinear inelastic based on 3-D Lagoudas model is simulated. The model is capable to predict the phase transformation and super elastic behavior of shape memory alloys. In order to develop thermo-mechanical equations of the shape memory alloy in the unit cell model, Newton-Raphson nonlinear numerical solution method is used. In the results, the effects of significant parameters on the thermo-mechanical response of composites are investigated and then the composite thermo-mechanical response is demonstrated in the high and low temperature interval and the effect of shape memory alloy wire activation in the composite is addressed. The presented results show that the composite residual strain in mechanical unloading decreases by enhancing temperature. Therefore, the composite residual strain approaches to zero when the temperature is higher than at which austenite transformation finishes. Comparison between the present research results with available previous researches shows good agreement
تحلیل غیرخطی رفتار ترمومکانیکی مواد مرکب فعال شده بوسیله الیاف آلیاژ حافظه دار
Authors [Persian]
سیامک مقبلی, محمدجواد محمودی
Abstract [Persian]
رفتار عمومی ترمومکانیکی مواد مرکب تقویتشده با الیاف آلیاژ حافظهدار با استفاده از یک روش تحلیلی میکرومکانیکی سهبعدی بهمنظور درنظرگرفتن اثر فعالشدن الیاف پیشبینی میشود. کامپوزیت بهواسطه این روش میکرومکانیکی میتواند تحت بارگذاریهای عمومی مکانیکی شامل بارگذاری عمودی و برشی و همچنین حرارتی قرار بگیرد که نهایتاً سبب فعالشدن الیاف آلیاژ حافظهدار در زمینه پلیمری میگردد. با توجه به قابلیتهای مدل میکرومکانیکی ارائه شده، آرایش الیاف در زمینه بهصورت توزیع مریعی شبیهسازی میگردد. المان حجمی نمایندهی کامپوزیت از دو فاز شامل الیاف آلیاژ حافظهدار و زمینه پلیمری تشکیل میشود و تحت بارگذاری مکانیکی چرخهای محوری قرار میگیرد. بهمنظور نمایش اثر فعالشدن الیاف بر پاسخ کلی کامپوزیت، رفتار زمینه پلیمر بهصورت الاستیک در نظر گرفته میشود و الیاف آلیاژ حافظهدار بهصورت غیرخطی غیرالاستیک بر اساس مدل سه بعدی لاگوداس شبیهسازی میگردد. این مدل قادر پیشبینی اثرات استحاله فاز آلیاژ حافظهدار و رفتار سوپرالاستیک آنها میباشد. در راستای بسط معادلات ترمومکانیکی آلیاژ حافظهدار در مدل سلول واحد، از روش حل عددی غیرخطی نیوتن- رافسون استفاده میگردد. در قسمت نتایج ابتدا اثرات پارامترهای مهم بر پاسخ ترمومکانیکی کامپوزیت بررسی میگردد و سپس پاسخهای ترمومکانیکی کامپوزیت در دو بازه دمایی زیاد و کم نشان داده میشود و اثر فعالشدن سیم آلیاژ حافظهدار درون کامپوزیت نمایش داده میشود. نتایج بیانگر این نکته میباشند که با افزایش دما کرنش باقیمانده در باربرداری مکانیکی در کامپوزیت کاهش مییابد بهگونهای که هنگامی که دما بالاتر از ناحیه اتمام تشکیل آستنیت باشد کرنش باقیمانده در کامپوزیت به صفر میل میکند. مقایسه نتایج تحقیق حاضر با تحقیقات موجود در دسترس پیشین، تطابق بسیار خوبی را نشان میدهد.
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