论文部分内容阅读
本文指出,链板挤孔能有效降低孔边的应力水平。通过实物疲劳试验和理论分析,给出合理的挤孔参数应使塑性区扩展至全屈服的88％,此时对1“、3/2”和2“链板应使孔边塑性变形量与孔径的比值分别为1.45％、1.73％和2.0％。但最大挤孔量不应使链板边缘达到屈服(即全屈服)。同时指出,链板挤孔量可不受反向屈服条件的限制。试验结果还表明,对3/2”链板合理的挤孔参数能使耐久极限提高90％,过载区寿命提高5倍左右。
This paper points out that the chain plate hole can effectively reduce the hole stress level. Through the physical fatigue test and theoretical analysis, it is shown that the reasonable extrusion parameters should extend the plastic zone to 88% of the total yield. At this time, the plasticity of the hole edges should be made for the 1 “, 3/2” and 2 “ The ratio of deformation to aperture is 1.45%, 1.73% and 2.0%, respectively, but the maximum amount of holes should not reach the yield edge (ie, full yield) .At the same time, it is pointed out that the amount of extrusion of the chain plate is not affected by the reverse yield condition Of the test results also show that the reasonable squeeze hole parameters of 3/2 ”chain plate can increase the durability limit of 90%, overload zone life expectancy increased by 5 times.