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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.
In view of the fact that the volute of a pumped storage unit is usually filled with concrete by using water-filled and pressure-retaining technology, the steel volute needs to undergo frequent frequent large-amplitude hydrostatic pressure cycles during operation and faces a certain degree of low-cycle fatigue failure risk. First, based on ABAQUS finite element analysis platform, the static and dynamic simulation of construction and operation process of this composite structure was completed. Then based on the DesignLife fatigue analysis platform, the static load was calculated according to the finite element static analysis The fatigue life of the steel volute is predicted by the cycle method, in which the SN curve (stress-life curve) of the material is selected as Eurocode3-112.The calculation results show that the local voidage of the steel volute during operation will produce its own force There is a significant causal correspondence between the negative impact zone, high-stress zone and high-fatigue failure risk zone.From the predicted fatigue life magnitude (above 2 × 10 ~ 5) Low cycle fatigue failure risk.