【摘要】 <正> 载荷谱是进行构件疲劳强度试验研究和寿命估测的基础。关于钻进状态下钎钢应力波的传播特性,Hawkes和Charavarty曾有报道。本文根据对实际钻进过程钎钢应力波的大量测定,用随机分析方法给出了凿岩过程中钎钢的工作载荷谱。一、实验工作实验装置如图1所示。试验钎钢为55SiMnMo,系直径22mm,长1.8m的中空六更多还原

【Abstract】 The load oscillogram for the hammer drill steel is presented to predict the fatigue behaviour and the service life under drilling conditions. Experiments were conducted to measure the longitudinal, flexural and total waves at the front, middle and back parts of the drill steel during drilling granite and limestone. Certain available results have been obtained to expound its failure mechanism and to further develop new type of steel.更多还原