پديدآورندگان :
Zabihi M. zabihimahmood1907@hotmail.com Fracture Fatigue Research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran; , Ayatollahi M. R. Fracture Fatigue Research Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran , Rezaei H. R. School of Metallurgy Materials Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran
كليدواژه :
Nanocrystalline Forsterite , Biomaterial Synthesis , Brittle Fracture , Mode I , II Loading.
چكيده فارسي :
In this research, nanostructured forsterite was synthesized via sol-gel method. The powder was pressurized under 200MPa pressure and was sintered under 1500oC so that required semi-circular bend (SCB) specimens are produced. Also the sintered samples underwent immersion test in order to validate their suitability for the mechanical tests. Notches in two specific angles were produced on the prepared items with calculated lengths, so that pure mode I and pure mode II loading conditions are obtained. It was observed that forsterite fails by in a brittle manner and the whole process of failing takes place instantly. The average fracture toughness calculated from the test results was 1.68 MPa (m1/2) which is in the range of what have been reported previously for this bioceramic. Additionally, the results were compared directly with two fracture criteria: maximum tangential stress (MTS) and Generalized MTS. The comparison emphasized the more accuracy of GMTS criterion compared to the MTS.
