塑性域締付けボルト締結体の疲労限度に及ぼす硬さの影響

概要

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The influences of hardness of bolts on the fatigue strength of bolted-joints tightened by the plastic-controlled tightening method were examined. The fatigue strength of bolted-joints was improved by 20% through hardening bolts from H_υ=300 to 400. Hardening bolts induced the higher prestress and restrainted the separation of bolted-joints. So, it decreased the additional stress of bolt under applied cyclic loadings. Also, hardening bolts improved the fatigue strength of bolts them-selves. From the microscopic observation, it was found that bolts of higher hardness could considerably restrict the initiation of fatigue crack at the root of thread groove. For the bolt hardened after roll-formed, decarbonizing the root of thread groove during heat treatment will deteriorate the fatigue strength of bolt.
一般社団法人日本機械学会の論文
1991-05-25