Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 27, No. 6 (June 2014) 991-1004   

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  A NEW COMPARATIVE METHOD TO EVALUATE THE FRACTURE PROPERTIES OF LAMINATED COMPOSITE
 
M. H. Heydari and N. Choupani
 
( Received: August 29, 2013 – Accepted: December 12, 2013 )
 
 

Abstract    In this paper a new method to determine the fracture properties and strain energy release rate for Carbon- Polyester composite has been introduced. Fracture characteristics such as critical stress intensity factor and critical strain energy release rate for mode I, mode II and mixed mode loading were determined using Arcan type specimen. 130 layers of carbon fiber polyester woven composite with each of 0.2mm thickness were put on each other. Theoretical studies to determine strain energy release rate were done using three methods: Corrected Beam Theory (CBT), Compliance Calibration Method (CCM), Virtual Crack Closure Technique (VCCT), and results were recorded and were compared with the results from experimental and numerical attempts. Critical loads were recorded with experimental attempts then applied to the finite element software. Results were recorded and compared with each other to determine the best method. Results show that compliance calibration method and virtual crack closure technique determine strain energy release rate value closer to J-integral in comparison with corrected beam theory. Finally, the fracture surfaces were examined by scanning electron microscope to gain insight the failure responses that shows the fracture surface for mode II is rougher than the fracture surface for mode I and mixed mode.

 

Keywords    Arcan, Fracture, Lamination, Interlaminar

 

چکیده    در اين مقاله يک روش جديد براي تعيين خواص شکست و نرخ رها سازي انرژي کرنشي کامپوزيت لايه اي کربن- اپوکسي معرفي شده است. پارامترهاي شکست نظير ضريب شدت تنش بحراني و نرخ رها سازي انرژي کرنشي براي مود يک، مود دو و مودهاي مرکب بارگذاري به کمک نمونة آرکان بدست آورده شدند. در اين مقاله 130 لايه کامپوزيت کربن- اپوکسي بافته شده با ضخامت هر لايه 2/0 ميليمتر روي يکديگر قرار داده شد. مطالعات تئوري به منظور بدست آوردن نرخ رها سازي انرژي کرنشي بر اساس سه روش CCM, VCCT, CBT انجام گرفت. در پايان نتايج ثبت شده و با نتايج مطالعات عددي و تجربي مقايسه شدند. به کمک آزمايشات تجربي، بارهاي بحراني از طريق آزمايشات با نرخ بارگزاري ثابت بدست آورده شدند و سپس به نرم افزار المان محدود اعمال شدند. مطالعات عددي در محيط نرم افزار آباکوس و روش انتگرال J انجام گرفت. نتايج حاصله از روش هاي مختلف با هم مقايسه شده و بهترين روش براي تحليل مشخص شد. نتايج پژوهش بيان مي کنند که نرخ انرژي کرنشي بدست آمده از روش هاي CCM و VCCT در مقايسه با روش CBT به روش انتگرال J نرديکتر ميباشد. در پايان، سطوح شکست تحت آزمايشات شکست نگاري به منظور مطالعة دقيق سطوح شکست در هر مود قرار گرفت. اين تصاوير بيان ميکنند که سطوح شکست مد دوم از مد يک و مدهاي مرکب سخت تر مي باشد.

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