Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 26, No. 8 (August 2013) 885-894   

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  MIXED MODE CRACK PROPAGATION OF ZIRCONIA/NICKEL FUNCTIONALLY GRADED MATERIALS
 
A. R. EL-Desouky and M. S. EL-Wazery
 
( Received: February 08, 2013 – Accepted: June 20, 2013 )
 
 

Abstract    Zirconia-nickel functionally graded materials were obtained by powder metallurgy technique. The microstructure, residual stress, fracture toughness and Vickers hardness were investigated. Mixed-mode fracture response of YSZ /Ni functionally graded materials was examined utilizing the three point bending test and finite element method (Cosmos/M 2.7). The results show that the stress intensity factors (KI, KII) for the FGM are less than those for non-graded composite (NGCs) under mixed mode loading conditions. There are some local perturbations in the crack propagation paths of the FGM and NGC specimens. Most of local perturbations exhibit in the layers with high Ni content such as the layers with 30%, 40% and 50% Ni, respectively. The local perturbations are believed to be caused by the local heterogeneity of the microstructure. The residual stress (maximum tensile stress) of the NGC (YSZ/50%Ni) was 122 MPa and was in agreement with the published paper.

 

Keywords    Keywords: functionally graded materials (FGM), powder metallurgy technique, mixed mode fracture, finite element method, Non-graded composite (NGCs) and maximum principle stress (MPS).

 

چکیده    مواد عامل دار دانه بندی شده نیکل- زیرکونیوم توسط روش فلزکاری گردی بدست آمده است. میکروساختار، استرس باقیمانده، سفتی ترک و سختی ویکرز مورد بررسی قرار گرفت. پاسخ ترک حالت مرکب مواد عامل دار دانه بندی شدهYSZ/Ni با استفاده از آزمایش خمش سه نقطه ای و روش جزء محدود (Cosmos/M 2.7) بررسی شد. نتایج نشان داد که شدت پارامترهای استرس(KI, KII) برای FGM کمتر از آن چپزی است که برای ترکیبات غیر دانه بندی نشده (NGCs) تحت شرایط بارگذاری حالت مرکب وجود دارد. تعدادی اختلال محلی در مسیرهای انتشار شکست نمونه های FGM و NGC وجود دارد. اغلب اختلال های محلی در لایه هایی با میزان نیکل بالا مانند%30، %40 و %50 نشان داده می شوند. این باور وجود دارد که اختلال های محلی توسط غیر همگون بودن میکروساختارها بوجود می آیند. استرس باقیمانده ( استرس کششی بیشینه) برای NGC (YSZ/50%Ni) برابر با MPa 122 بود که با مقاله های چاپ شده مطابقت داشت.

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