We perform complex diagnostics of the technical state of steel structure of a grab reloader after operation for more than 40 yr by the methods of destructive and nondestructive testing. Fatigue cracks and mechanical defects caused by wear are detected on the shaped rolled products. By using the magnetic method with determination of the coercive force, we analyze the stress-strain states of various elements of the metal structure, which enables us to detect potentially hazardous zones. For these zones, we study, in particular by the fractographic analysis, the mechanical characteristics of strength, plasticity, and impact toughness and show that the degree of in-service degradation of the metal correlates with the estimates of its stress-strain state.

中文翻译：

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抓取式重新装载机操作元件状态的复杂诊断

我们通过破坏性和无损检测的方法对运行 40 多年后的抓斗式装载机钢结构的技术状态进行复杂的诊断。在成型轧制产品上检测由磨损引起的疲劳裂纹和机械缺陷。通过使用磁性方法确定矫顽力，我们分析了金属结构各种元素的应力应变状态，这使我们能够检测潜在的危险区域。对于这些区域，我们特别通过断口分析研究了强度、塑性和冲击韧性的机械特性，并表明金属在使用中的退化程度与其应力应变状态的估计值相关。