粘弹性悬挂机构疲劳特性的试验研究

EXPERIMENTAL STUDY OF FATIGUE CHARACTERISTICS FOR VISCOELASTIC SUSPENSIONS

为掌握新开发的工程车辆用粘弹性悬挂机构的疲劳特性，需对机构用防振橡胶材料开展疲劳特性的试验研究。由于缺乏防振橡胶制品的疲劳失效标准，因此，如何确定防振橡胶强化疲劳试验的参数就成为新的研究课题。针对悬挂机构的强化疲劳试验，对其疲劳失效的特征值，如循环次数ｎｅ，Ｓ－Ｎ对数曲线的效率ｋ及许可温升等参数进行了探索。为开发新型粘弹性悬挂机构推土机，研制了３种橡胶配方，按照推土机实际工况，编制了８级载荷谱，对悬挂机构开展了强化疲劳试验的研究。本研究所获参数己应用于新开发的 ３８６ ｋＷ履带式推土机粘弹性悬挂机构的疲劳试验，经 ４ ０００ ｈ的工业应用，实际结果与试验预测相吻合。

In order to master the characteristics of viscoelastic suspensions used in construction vehicles developed recently, the experimental study must be performed for the vibration absorbed rubber materials installed on the suspensions. It is a new problem how to make sure these parameters to intensive fatigue experiments due to the lack of the standards of fatigue failures for the rubber materials. As for the intensive fatigue experiments for the suspensions, the characteristic values of the fatigue failure are probed, such as cycle index ne, the slope k of the S-N logarithm curves, and permissible values about rising temperatures. For developing the new type of viscoelastic suspensions installed in track-type bulldozers, three types of rubber formulas are developed, 8-level load collections of illustratived plates are established, then, the research about the intensive fatigue experiments is carried out. Through the investigation the results are applied to fatigue experiments for the suspensions used in 386 kW track-type bulldozers. Through 4 000 h application, practical data are accordant with predictive analyses in the experiments.