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在重型采矿设备中,经常发生疲劳破坏及伴随的脆性破坏。本文讨论了如何以断裂力学为工具进行裂纹控制和裂纹处理的。提供了一些有关确定特定部件发生脆性破坏方面的资料。利用现有的断裂力学公式,可以估算临界裂纹的尺寸。本文阐述了为成功地应用断裂力学,必须了解的零件中的实际工程应力和所用材料的机械性质。通过计算材料在室温和低于零度条件下的临界裂纹尺寸从量上说明了低温韧性的重要性。了解了断裂力学的应用可能性,设备购买者可更精确地分析一些零件在裂纹容限和预防破坏方面的相对质量。这样,设备用户和制造厂之间的联系就会变得更加确切而有效,从而进一步改进矿山设备的设计。
In heavy mining equipment, fatigue damage and accompanying brittle failure often occur. This article discusses how to use crack mechanics as a tool for crack control and crack processing. Provides some information on determining the occurrence of brittle failure of a specific part. Using the existing fracture mechanics formula, the size of the critical crack can be estimated. This paper illustrates the practical engineering stresses in the part and the mechanical properties of the material used to successfully apply fracture mechanics. The importance of low temperature toughness is demonstrated quantitatively by calculating the critical crack size of the material at room temperature and below zero. Understanding the possibilities of fracture mechanics allows equipment buyers to analyze more accurately the relative qualities of some parts in terms of crack tolerance and preventative damage. In this way, the connection between the equipment user and the manufacturer becomes more accurate and effective, further improving the design of the mining equipment.