Abstract
Bulk metallic glass (BMG) has unique mechanical properties, combining high strength and low Young's modulus. By applying BMG to the fabrication of fastening bolts, high resistance against bolt loosening is expected. The authors have developed hexagonal cap bolts made of zirconium-based BMG by cold thread rolling. The BMG bolt showed a high tensile strength of more than 1550 MPa with 1.6% plastic strain. In this study, fastening features of the BMG bolts are investigated comparing with those of conventional high tensile strength steel bolts. In addition, bolt loosening test were conducted by using newly developed test equipment which comply with Junker's test machine. The test parameters are initial clamping force and amplitude of oscillation applied to the direction perpendicular to bolt axis. The results reveal that BMG bolt maintains the clamping force at the larger oscillation amplitude with smaller initial clamping force than high tensile strength steel bolts.
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