20 g钢对接焊接接头循环应力-应变的特性
Cyclic Stress-strain Behaviors for Butt Joint
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摘要: 利用低周疲劳单试样步增量法,得到了20 g钢的母材、焊缝和焊接接头试样的循环应力-应变曲线及相关低周疲劳性能参数;分析了焊接接头各区域组织对循环应力-应变行为的影响,说明了焊接接头组织不均匀性引起的力学性能不均匀性的存在及作用。试验表明,具有组织不均匀性和力学性能不均匀性的焊接接头试样与均质的母材或焊缝试样的循环应力-应变行为是不同的,在锅炉及压力容器疲劳设计中应考虑这些不均匀性对焊接结构疲劳性能的影响。Abstract: Low cycle fatigue tests had been carried out to investigate the cyclic behaviors of welded butt joint of structural steel. Cyclic stressstrain curves of weld metal, base metal and welded joint were obtained respectively by means of incremental step method in various strain levers with single sample method. The different cyclic stress-strain behaviors of three kinds of specimen were compared and analyzed. For butt joint specimen, the weld metal, heat affection zone and base metal, are loaded cyclically. It is proposed that the heterogeneity of mechanical property resulted from the heterogeneous microstructure of welded joint causes the different cyclic stress-strain properties from the other two kinds of specimen. The heterogeneity affecting fatigue behaviors of welded joint should be conceded during the design of boiler and pressure vessel structures.
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Keywords:
- welded joint /
- fatigue /
- cyclic /
- stress /
- strain
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