起重机械用Q345钢断裂韧度的微小试样预测方法研究  

Research on prediction method of fracture toughness of Q345 steel for hoisting machinery by micro sample

作　　者：顾雯雯 孙勇 Gu Wenwen;Sun Yong

机构地区：[1]南京市特种设备安全监督检验研究院,南京210019

出　　处：《起重运输机械》2024年第22期93-99,共7页Hoisting and Conveying Machinery

摘　　要：为了实现起重机械,特别是焊缝、应力集中区等关键区域的裂纹扩展预测,能够有效减少因起重臂、塔身折断或损坏导致的事故,为科学、合理的安全监管和风险评估提供数据支撑,文中针对常规断裂韧度测试需要大尺寸破坏性取样、无法应用于在役起重机械不足的问题,从单位面积等效裂纹损伤耗散能(即损伤耗散能释放率)与单位面积裂纹表面自由能的等效关系入手,提出了基于微型拉伸的断裂韧度预测新方法,所述方法可靠性通过Q345B钢验证。To realize the crack propagation prediction of crane,especially in key areas such as welding seam and stress concentration area,effectively reduce accidents caused by the breaking or damage of boom and tower,and provide data support for scientific and reasonable safety supervision and risk assessment.In this paper,considering that conventional fracture toughness testing requires large-scale destructive sampling and cannot be applied to in-service crane,and based on the equivalent relationship between the equivalent damage dissipation energy per unit area(i.e.the release rate of damage dissipation energy) and the surface free energy per unit area,a new fracture toughness prediction method based on microtension is proposed,and the reliability of the method was verified by Q345B steel test.

关 键 词：起重机械 断裂韧度 微小试样 损伤耗散能 等效裂纹 

分 类 号：TH213.3[机械工程—机械制造及自动化] TG111.91[金属学及工艺—物理冶金]