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概述挖掘机、推土机、装载机等工程机械中的金属结构件承受的是一种复杂变化的周期载荷,且经常承受冲击和超载,由此产生的动载荷应力变动范围比其它机械大。故主要形成疲劳破坏,且多发生在低频高应力情况下。因此,材料性能的主要要求是疲劳强度,尤其是低频高应力下的低循环疲劳强度。工程机械结构件在低温下工作,材料的冲击韧性和断裂韧性显著降低,容易出现脆性破坏,因此,选材必须重视其低温韧性;工程机械结构件在砂土、岩
Overview Metallic structures in excavators, bulldozers, loaders and other construction machinery are subject to a complex cyclic load of varying loads, often subject to shock and overload, resulting in a greater range of dynamic load stresses than other machines. Therefore, the main form of fatigue damage, and more in the case of low-frequency high stress. Therefore, the main requirement for material properties is fatigue strength, especially low cycle fatigue strength at low frequency and high stress. Construction machinery structural work at low temperatures, the impact toughness and fracture toughness of the material significantly reduced, prone to brittle failure, therefore, the selection must pay attention to its low temperature toughness; construction machinery structure in the sand, rock