Research on the mechanical property test of a new high-strength metal bolt |
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Authors: | Jian-jun Shi Nian-jie Ma |
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Affiliation: | (1) School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing, China;(2) Geological Engineering Program, Department of Materials Science and Engineering, University of Arizona, Tucson, AZ 85721, USA; |
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Abstract: | In order to study how to improve the overall performance of the operational metal bolt, based on the production process of
an ordinary metal bolt used in understructure engineering, this paper focused on the existing problems of ordinary metal bolts
identified by some survey and analysis. The results show that the structure of operational metal bolts is so unreasonable
that the bolt tail is easily fractured by low load capacity. Furthermore, a new type of strong big-end metal bolt and its
heat treatment and roughing processing technology were introduced. Through bolt tensile and metallographic tests, the property
of the new big-end bolt was analyzed. The new findings indicate that after a special processing, the overall strength and
plasticity of the bolt is greatly improved, and the grain of the bolt tail structure is refined, which would help build up
favorable working conditions for bolt tails. |
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