Toughness Enhancement in Nanocomposite Thermosets with Application to Carbon-Epoxy System
Neat epoxy and epoxy-based nanocomposites were subjected to monotonic uniaxial and fracture toughness testing.Samples of epoxy filled with 0.1wt% multi-wall carbon nanotubes (MWNT) and of epoxy filled with 0.1wt% graphene platelets (GPL) were considered.The nanoscale inclusions were used in the as-received state.The processing procedure involved sonication and high-speed mixing followed by degassing and curing.Traction tests were performed with ASTM-type specimens using both an Epsilon extensometer and the digital image correlation method (DIC).DIC was performed using an ARAMIS system and the entire length of each specimen was analyzed.The stress-strain behavior of these materials was essentially identical.However,the toughness of MWNT was even 50% higher than that of neat epoxy.The toughness of GPL-filled epoxy was only marginally larger than that of the neat matrix.These observations are attributed to the crack bridging effect of the MWNT.
Nanocomposites Fracture toughness Digital image correlation Crack bridging
Catalin Radu Picu Dan Mihai Constantinescu Marin Sandu Drago(c) Alexandru Apostol Ioana Cosmoiu
Department of Mechanical,Aerospace,and Nuclear Engineering,Rensselaer Polytechnic Institute,Troy 121 Department of Strength of Materials,University POLITEHNICA of Bucharest,Bucharest 060042,Romania
国际会议
北京
英文
1-5
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）