Measurement of the Fracture Toughness and Critical Stress for Cracking in SnO2 Nanobelts Using Nanoindentation
单晶SnO2纳米带裂纹形核的临界应力和断裂韧性

The hardness, fracture toughness and the critical stress for crack initiation of single crystalline nanobelts have been measured using nanoindentation method. The result showed that a sudden depth excursion occurred in the load--depth curves which corresponds to initiation of an indentation crack. The critical stress for the crack initiation. which is one order of magnitude less than that of the other bulk brittle materials. The average values of the hardness and modulus are H=6.25 GPa and E=86.7 GPa, respectively.