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A fatigue life prediction method for coke drum base, weld, and HAZ materials from tensile properties

机译:基于拉伸性能的焦炭塔底,焊缝和热影响区材料的疲劳寿命预测方法

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摘要

The importance of material fatigue information in design has been well recognized. There are a few existing fatigue life prediction methods based on materials tensile properties. Some of these fatigue life prediction methods can be successfully applied for non-heat affected materials. However, industrial components, such as pressure vessel and pipelines are commonly constructed by welding parts together. The fatigue lives of welded section and its surrounding material could be greatly affected by the welding process. Therefore, it is beneficial to develop a fatigue life prediction model for the weld and surrounding heat affected zone (HAZ) materials based on their tensile testing data. In this paper, fatigue lives of base material and its weld and HAZ materials for constructing coke drums are studied. Mechanical properties are first obtained from the tensile tests. Then, fully-reversed strain-controlled fatigue tests were performed. It is found that the fatigue life of pure base material is roughly twice of the weld and four time of the HAZ at the same strain amplitude. Four-point correlation (FPC) method by Manson can reasonably predict the life of base material. However, it over-predicts the lives of weld and HAZ. By introducing two reduction factors R_(plastic) and R_(elastic) for the weld and HAZ material respectively into the FPC method, the over-prediction can be rectified. Therefore, the proposed modified FPC method could be applied in predicting fatigue lives of weld and HAZ materials.
机译:材料疲劳信息在设计中的重要性已得到公认。现有一些基于材料拉伸性能的疲劳寿命预测方法。这些疲劳寿命预测方法中的某些方法可以成功地应用于非热影响材料。但是,诸如压力容器和管道之类的工业部件通常是通过将部件焊接在一起而构造的。焊接过程会极大地影响焊接部位及其周围材料的疲劳寿命。因此,有益的是基于其拉伸测试数据为焊缝和周围热影响区(HAZ)材料开发疲劳寿命预测模型。本文研究了焦炭鼓的基础材料及其焊接和热影响区材料的疲劳寿命。首先从拉伸试验中获得机械性能。然后,进行了完全反向的应变控制疲劳试验。发现在相同的应变幅度下,纯母材的疲劳寿命大约是焊缝的两倍,是热影响区的四倍。曼森(Manson)的四点相关(FPC)方法可以合理地预测基材的寿命。但是,它过度预测了焊缝和热影响区的寿命。通过将分别用于焊缝和热影响区材料的两个折减系数R_(塑性)和R_(弹性)引入FPC方法,可以纠正过高的预测。因此,所提出的改进的FPC方法可用于预测焊接和热影响区材料的疲劳寿命。

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