充水保压蜗壳结构中钢衬的低周疲劳问题

发布时间：2018-05-04 01:20

本文选题：水电站厂房 + 蜗壳　；参考：《华中科技大学学报(自然科学版)》2017年08期

【摘要】：鉴于抽水蓄能机组蜗壳通常采用充水保压技术埋入混凝土,在运行期钢蜗壳须要承受频繁的大幅值静水压力循环作用,面临一定程度的低周疲劳失效风险,以某实际充水保压蜗壳结构为例,首先基于ABAQUS有限元分析平台完成了该组合结构的施工-运行过程静力仿真分析,然后基于DesignLife疲劳分析平台,依据有限元静力分析结果采用常幅值荷载的循环方式预测了钢蜗壳的疲劳寿命,其中材料的S-N曲线(应力-寿命曲线)选取为Eurocode3-112.计算结果表明:运行期钢蜗壳的局部脱空现象会对其自身的受力产生不利影响,脱空区-高应力区-高疲劳失效风险区三者间存在显著的因果对应关系.从预测的疲劳寿命数量级(2×10~5以上)看,电站运行期内钢蜗壳无低周疲劳失效的风险.
[Abstract]:In view of the fact that the volute of pumped storage unit is usually embedded in concrete with the technique of water filling and maintaining pressure, the steel volute has to bear frequent hydrostatic pressure cycles with large values during operation, and it faces the risk of low cycle fatigue failure to a certain extent. Taking a practical volute structure with water filling and maintaining pressure as an example, the static simulation analysis of the construction-running process of the composite structure is completed based on ABAQUS finite element analysis platform, and then based on the DesignLife fatigue analysis platform. The fatigue life of steel volute is predicted by the cyclic mode of constant amplitude load according to the static analysis results of finite element method. The S-N curve (stress-life curve) of the material is chosen as Eurocode3-112. The results show that the local void phenomenon of steel volute during running period will have a negative effect on its own forces, and there is a significant causal correspondence between the void zone, the high stress zone and the high fatigue failure risk zone. According to the predicted fatigue life of more than 2 脳 10 ~ (5), there is no risk of low cycle fatigue failure in the steel volute during the operation period of the power station.
【作者单位】：长江科学院水利部水工程安全与病害防治工程技术研究中心;武汉大学水资源与水电工程科学国家重点实验室;长江勘测规划设计研究院;
【基金】：国家自然科学基金资助项目(51679013,51609020,51679175,51309030) 水资源与水电工程科学国家重点实验室(武汉大学)开放研究基金资助项目(2015SDG02) 中央级公益性科研院所基本科研业务费资助项目(CKSF2016015/GC,CKSF2017067/GC)
【分类号】：TV33

【相似文献】