Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 08, 2016 - October 10, 2016
We investigate the fracture behavior of single crystal graphene using in-situ tensile test. Pristine graphene, which is generally single crystal is obtained by mechanical peeling method. For fracture testing, we introduce pre-crack with a focused ion beam. Before tensile test, we identify the geometry and crystal structure of the specimen using a scanning electron microscope (SEM) and a transmission electron microscope, and confirm the layer number of the specimen with Raman spectroscopy. The bilayer graphene specimen with center crack fabricated by a focused ion beam, is tensioned using in-situ tensile testing system under scanning electron microscope. From in-situ tensile test, we obtain load-displacement curve and continuous SEM images. The test results explain that the graphene specimen shows an unstable and brittle fracture behavior and that cracks propagate from tips of pre-crack.
