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在ＭＴＳ上完成平衡梁全尺寸疲劳试验后，研究了试验断口上疲劳裂纹萌生、发展的原因、过程和特点；获得箱形焊接结构的３种寿命预测模型；对选择异材设计的平衡梁，提出了改进意见。
After completing the full-scale fatigue test of the balance beam on the MTS, the causes, processes and characteristics of the fatigue crack initiation and development on the test fracture were studied. Three kinds of life prediction models of the box-shaped welding structure were obtained. For the balance beam, Put forward suggestions for improvement.