根据对枞树型叶根-轮缘榫头各对齿负荷分配的研究,指出了原设计的第四对齿面的挤压应力将高达8270kg/cm~2,超出了轮缘材料的屈服极限。而这种叶根和轮缘榫头的实际咬合情况,使在挤压面靠近齿槽处,承受撕拉作用。这里对于疲劳和应力腐蚀来说,将是一个敏感源。所以建议把叶根第四齿改成同其它齿一样高。在钢板模型电测试验时,实际测得的应变偏小1/10,从而发现了 According to the research on the load distribution of the fir root-rim tenons, it is pointed out that the compressive stress of the fourth designed pair of tooth flanks will be as high as 8270kg / cm ~ 2, exceeding the yield limit of the rim material. And this leaf root and flange tenon the actual occlusion situation, so that the extrusion surface near the alveolus, to withstand the tearing effect. Here for fatigue and stress corrosion, it will be a sensitive source. So it is recommended to change the fourth root of the root blade to the same height as the other teeth. In the electric model test, the actually measured strain was found to be 1/10 smaller