【摘要】 经测定六种制造螺旋桨常用的铜合金材料的断裂韧度及裂纹亚临界扩展速率,提供了确定叶片在弯曲下临界裂纹尺寸,以及裂纹亚临界扩展寿命的估算。对“大庆62号”断桨的寿命作了计算,大致与使用时间相符合。更多还原

【Abstract】 This paper gives experimental results of six copper-alloys’ fracture toughness and fatigue crack growth rate. Some large propellers for ships are made from these alloys. The service life of the large propeller is analysised by means of fracture mechanics. The life of the failured propeller’s blade in the ship of the "Da Qing 62" is also estimated. The result shows that there is a good agreement between theoretical and practical service life. This implies that fracture mechanics is a good means for predicting the life of large propellers.In the end of this paper, author shows some aspects to be considered further.更多还原