通过计算证明引起断裂的根本原因是动应力超过了梁的许用疲劳极限，另一原因是梁的结构不合理。
The primary cause of breakage is that the dynamic stress exceeded the allowable fatigue limit of the beam, and another cause is that the structure of the beam is unreasonable.
结果表明，驱动桥壳空心梁和半轴套管部分的应力远小于材料的许用应力，而悬架支座与桥壳连接处出现了局部应力过大的情况。
The results show that stress in hollow beam and semi-shaft bush is much less than permissible stress, while joint of suspension frame and axle housing has too large local stress.
主梁下挠变形的主要原因是受热引起的最大复合应力超过许用值，达到了屈服极限值，强度不满足要求。
The main reason of the main beam down deflection was that the most complex stress exceeded the admissible value and achieved the yield limit value.
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