【摘要】 基于有限寿命设计原理,运用波动力学、冲击钻进动力学,分析了钎杆抗断性能及其疲劳寿命影响因素,提出了具有低应力、高抗断阻力特性的薄壁管式钎杆结构·薄壁管式钎杆,以不增加钎钢消耗量为前提,通过显著增大钎杆外圆直径,达到提高钎杆抗断性能、降低钎杆循环应力水平的目的·同时,结合材料的S-N曲线和钎杆的理论载荷谱,运用电算程序,预估了新型结构钎杆的抗疲劳寿命·工业考核表明,薄壁管式钎杆的疲劳寿命达到1200m,比国产传统钎杆提高近70%·更多还原

【Abstract】 Based on the principle of finite life design, the influencing factors on the fracture resistance and fatigue life of drill rod are analyzed according to wave mechanics and dynamics of percussive drilling. A thin-wall tubular drill rod is thus suggested to improve its fracture resistance by low stress distribution. With the purpose of no extra consumption of drill steel but improving the fracture resistance of drill rod by reducing its cyclic stress, the outer diameter of drill rod is remarkably increased. The fatigue life of the newly developed drill rod is also predicted according to the S-N curve of drill steel and its theoretical loading spectrum. Industrial test indicates that the fatigue life of the thin-wall tubular rod is up to 1200m, near 70% higher than that of domestic conventional products.更多还原